Fourth Doctor

Filled with wanderlust and a renewed curiosity towards exploring time and space, the Fourth Doctor left all ties of his previous incarnation's exile behind on Earth, setting off to travel the universe, taking advantage of his freedom once more.

This incarnation of the Doctor initially travelled with Sarah Jane Smith and Harry Sullivan, but Harry chose to remain on Earth when the opportunity arose. The Doctor and Sarah continued on their adventures until the Doctor was summoned to Gallifrey, necessitating that he leave her behind as humans were not allowed on Gallifrey at the time.

After tangling with on Gallifrey when he tried to heal himself and renew his regeneration cycle, he met and travelled with Leela of the Sevateem. During his travels with Leela, the Doctor gained a new companion in the robot dog, K9. Returning once more to Gallifrey to stop an invasion of Vardans, Leela and the original K9 stayed behind there.

On the White Guardian's orders, the Doctor began looking for the Key to Time with fellow Time Lady Romana and K9 Mark II. Once that search was concluded, the Doctor and Romana went on the run from the Black Guardian. Not long after, Romana regenerated into a new body and continued to travel with the Doctor and K9. When they attempted to answer a Gallifreyan summons, the trio accidentally passed into the smaller universe of E-Space.

During his travels in E-Space, the Doctor gained a new companion in the teenaged mathematical genius Adric. Romana and K9 stayed behind in E-Space as the Doctor and Adric departed for N-Space. There, they encountered a Trakenite named Nyssa and a human named Tegan. The foursome successfully prevented the destruction of the universe by, but only at the cost of this incarnation's life.

The Doctor prepared for the worst when the Watcher, an entity born of his own immediate future, appeared to warn him of his demise. Due to the Master messing with the rotation controls for the Pharos radio telescope, the Doctor fell a great height. Suffering terrible injuries, he was assisted by the Watcher in his last moment, who joined with him and helped him regenerate into his next incarnation.

A day to come
The First Doctor would occasionally have premonitions of his future incarnations, (PROSE: A Big Hand for the Doctor) and there was a rumour that he was able to glimpse his first seven regenerations during a game of Eighth Man Bound. (PROSE: Christmas on a Rational Planet, Lungbarrow)

When the First Doctor learned that he was diverted from the South Pole by "forces from the future" to stop him from becoming an incarnation that would play a key role in a future conflict, he was informed by the Player that he would have "lots of new faces" before he regenerated into the incarnation involved in the conflict. (AUDIO: The Plague of Dreams)

Shortly before his regeneration, the First Doctor was told of "a few false starts" before he became the Twelfth Doctor. (TV: Twice Upon a Time)

The First Doctor was shown footage of the Fourth Doctor, as well as his ten other successors, by the Testimony when he expressed doubt over the Twelfth Doctor's identity. (TV: Twice Upon a Time)

During an encounter with the Eighth Doctor, the Third Doctor was told that he "[would] end [his time] by [his] own choice, in a noble cause". (PROSE: The Eight Doctors)

After he unknowingly worked with his successor to defend a submarine from the Sea Devils, the Third Doctor could remember getting assistance from "an unknown member of the sub's crew" who he couldn't recognise when he saw his face on a monitor. (COMIC: Under Pressure)

The Third Doctor briefly regenerated into his fourth incarnation after he fell off a roof during a struggle with the Nurazh. The Nurazh attempted to take over the dying Doctor's mind, but was unable to cope with two different versions of the Doctor at the same time and perished, healing the Doctor back to his third incarnation. Jo Grant saw the Fourth Doctor long enough to describe him to the Third Doctor as being "all teeth and curls". (PROSE: The Touch of the Nurazh)

The Third Doctor was later told by Sarah Jane Smith that she had been present during his regeneration, with the Doctor commenting that he became "teeth and curls" by studying Sarah Jane's hand movements. (TV: The Five Doctors)

Post-regeneration
The Third Doctor's death took place ten years after the radiation from the Great One's lair caused severe damage to his body. (PROSE: Love and War) He returned to Earth to end his time in the company of Sarah Jane and the Brigadier. Cho-Je soon arrived and kick started the regeneration. (TV: Planet of the Spiders)

Once he had regenerated, the Doctor suffered delirium, mumbling random things from his past adventures, and was physically exhausted. He was put in sickbay, where medical officer Harry Sullivan kept watch on him. However, the Doctor managed to outwit him and get to his TARDIS to leave. (TV: Robot)

Slipping away from UNIT HQ, (PROSE: Doctor Who and the Face of Evil) the Doctor visited a planet colonised by the Mordee expedition, and encountered the colony ship's powerful computer, Xoanon, which he repaired from damage Xoanon sustained, accidentally imprinted his own mind on the computer, leaving him with multiple personalities. (TV: The Face of Evil) He also visited Pesca, and encountered the Pescaton leader, Zor. (AUDIO: Doctor Who and the Pescatons)

Returning to UNIT HQ, though still with situational awareness issues, the Doctor was asked by the Brigadier to help deal with the Think Tank and their K1 robot, which had gone insane from so many contradictory orders its programming should have prevented it from doing. Afterwards, he returned to travelling in his TARDIS, taking Sarah Jane and Harry with him, abandoning a UNIT dinner party at Buckingham Palace and leaving without telling the Brigadier. (TV: Robot)

The Nerva Beacon
Due to Harry's inadvertent interference with the helmic regulator, the TARDIS landed on Space Station Nerva, where humanity had been cryogenically suspended to await Earth's recovery from solar flares. There, the Wirrn wished to use the humans as food and incubators for their kind after the human race had destroyed their breeding colonies throughout the Andromeda galaxy in a thousand-year battle with them, sending them into space. Unable to reproduce without terrestrial colonies, they sent their queen to the Nerva Beacon, who birthed several larvae before she died from the Nerva Beacon auto-guard. The larvae began to feast on humans, absorbing their knowledge and their bodies. Luckily, Noah, a human was converted into a Wirrn, retained his strong will and tricked the Wirrn into a suicide. Afterwards, on behalf of the space station, the Doctor went down to Earth with Harry and Sarah Jane to fix the transmat relay, leaving the TARDIS on the station, while Vira, the station's first medtech, tended to waking the rest of her crew from their long sleep. (TV: The Ark in Space)

Once on Earth, they found the Sontaran Styre conducting experiments on humans as a prelude to an invasion. Caught in the wrong place at the wrong time, the Doctor was accused of murdering a GalSec officer among a crew who had been lured to the Earth and slowly picked off by Styre. After escaping them, he rescued Sarah from an experiment where her inner fears were used against her. Styre appeared to fatally shoot the Doctor as he fled, but the Doctor had nicked a piece of the Nerva's synestic locking system, which guarded him from injury.

Knowing a Sontaran would not refuse an opportunity to engage in mortal combat, the Doctor returned and challenged Styre to a duel. This wore him out and bought Harry enough time to remove a terullian diode bypass transformer from the ship that nurtured Styre with energy, making the energy feed on Styre instead. The Doctor went on to address the Marshal who had sent Styre to Earth. The Doctor defeated his plans by bluffing the Marshal to call off his attack, allowing the resettlement of Earth to proceed, and transmatted with his companions back to the space station to retrieve the TARDIS. (TV: The Sontaran Experiment)

Intercepting their transmat beam, a Time Lord messenger appeared to the Doctor and forced him to undertake a mission on the Time Lords' behalf: prevent the creation of the Daleks or induce them to develop into less aggressive creatures. The messenger also gave the Doctor a Time Ring, which he could use to get back to his TARDIS. Upon their arrival on Skaro, the Doctor, Sarah Jane and Harry was caught up in a war between the Kaleds and Thals, with the Doctor being taken prisoner by the Kaleds with Harry after being separated from Sarah Jane. While being questioned, the Doctor met the creator of the Daleks, a scientist named Davros, attempting to genetically engineer the Kaleds as the effects of their weapons caused them to mutate, seeking to evolve their mutations into a perfect form. Despite respecting each other as scientists, the Doctor was unable to convince Davros to change the Daleks into better creatures.

When he revealed he knew of several defeats of the Daleks in the future due to faults in their design, the Doctor was forced to tell Davros of each failure the Daleks suffered, so that he could prevent them. Attempting to gauge the extent of his insanity, the Doctor posed a question to Davros, asking him what he would do if he possessed the power to end all other life. Davros's willingness to utilise such power horrified the Doctor, tempting him to cut off his life supports as a last resort of stopping his plans, but he was prevented from doing so by Nyder, and he was imprisoned. Escaping, the Doctor destroyed Davros' recording of the foreknowledge, thus keeping the future from changing for the worse.

The Doctor found little other option left than to ensure the Daleks would never exist, and had the opportunity to blow up the stock of embryonic Daleks that Davros had produced. However, he questioned if he had the right to destroy the Daleks, knowing that wiping out an entire species would make him just like them, and the fear of the Dalek had caused many worlds to ally with each other. With this in mind, the Doctor allowed the Dalek species to persist, and chose to stall their rise to power instead. Failing to listen to the Doctor's warnings, Davros found his own creations usurping him. Because they were programmed to acknowledge any creature as inferior to the Dalek, they deemed him unworthy to rule them. Fleeing after the Daleks killed Davros, the Doctor buried them and their factory underground, delaying their progression by a thousand years. (TV: Genesis of the Daleks)

After departing from Skaro, the Doctor, Sarah Jane and Harry became scattered across the Adelphine Cluster due to a temporal disruption interfering with the time ring. However, they were eventually united by the interventions of the Time Lords, who also provided them with a replacement time ring. (PROSE: A Device of Death)

Using the time ring, the Doctor, Sarah and Harry set off for Space Station Nerva. But instead, they arrived on the Desolii, a famous ghost ship, where they encountered friendly robots, microscopic psychiatrists and ghosts. (PROSE: The Last Thing You Ever See)

Due to the interference of the CIA, (PROSE: A Brief History of Time Lords) the Doctor, Harry, and Sarah Jane returned to the Space Station Nerva earlier in its time line, when it orbited Jupiter, which had a fifty-year assignment to guide space freighters. The TARDIS was travelling back through time to them, leaving them stranded until it arrived. While waiting for it to arrive, the Doctor became involved with stopping a Cyberman attack on Voga, the planet of gold, to keep the resource of their major weakness to a minimum in the Cyber-Wars. The Doctor ultimately stopped them from blowing up the planet, defeating them once more. Finally reunited with the TARDIS, the Doctor received a call for help from the Brigadier via a space-time telegraph. (TV: Revenge of the Cybermen)

Another account of events, the Doctor, Harry, and Sarah landed at a different time than expected in the mess hall. Shortly after arriving, Kellman tried to kill them in a crusher room. He learnt that there was a plague which he recognised from his travels, and when a Cybermat attacked Sarah he realised it was the Cybermen. He devised a way to attack the Cybermen using the stations X-Ray machine. He thought that the Cybermen might be in the oxygen canisters, and discovered a strange body stashed inside them. After negotiating the antidote for the plague from the cyberleader, curing Sarah, he followed Kellman to the asteroid of gold. He discovered that it was inhabited. With Sarah using reprogrammed Cybermats to destroy the Cybermen, he managed to stop the Beacon crashing into the asteroid. (AUDIO: Return of the Cybermen)

Returning to UNIT
With the TARDIS still recovering from solar flare radiation, the Doctor took Sarah and Harry to 24th century Prague, where they visited a museum and discovered a dead body in one of the exhibits. The Doctor was accused of murder, but persuaded the police to allow him to take over the investigation. He and his two friends discovered nanoprobes had been in-bedded into the city, and further investigating soon led him to the killer. (PROSE: Nanomorphosis)

While answering the Brigadier's distress call, the Doctor lost Harry in a Somerset wood in November 1936, and found his grave in December 1936, causing him and Sarah to investigate what had happened to him. Learning that the land had been "woken up" by the spell of Hester Stanton, the Doctor and Sarah put the land back to sleep using the blood of werewolf Emmeline Neuberger before returning to November to recover Harry, after Sarah received confirmation from a dryad that they had done so. (PROSE: Wolfsbane)

After Sarah accidentally released the Carrionites that had been imprisoned in the TARDIS by a future incarnation of the Doctor, the TARDIS was attacked by several Reapers due to the Carrionites using their powers to travel back through time to escape. As the Doctor fended off the Reapers, Harry brought him the crystal ball that held the imprisoned Carrionites, and they were devoured by the Reapers upon their escape. With their intentions achieved, the Reapers left as the TARDIS landed in 1975 Scotland. (PROSE: Toil and Trouble)

The Doctor, Sarah and Harry met up with the Brigadier, and discovered that an alien race known as the Zygons were planning to use a Skarasen to attack London and abducting people to power body-prints that let them shape-shift into the forms of humans as disguises, the disappearance of the Duke of Forgill being among them. The Doctor and company had several close calls with the Zygons and eventually discovered the location of their spaceship, rescuing everyone, during which, the Doctor instigated the ship to self-destruct.

Discovering the plan was to have the Skarasen besiege Stanbridge House in a display of power, the group made haste to London. As the Brigadier and UNIT took care of the surviving Zygon commander, Broton, the Doctor found the trilanic activator used to control the Skarasen's movement and gave it to the Skarasen, who ate it and returned to Loch Ness. The Doctor prevented the destruction of the city, though the monster was still seen by the populace, and the Brigadier would have to quietly cover up the incident. After returning to Scotland to retrieve the TARDIS and bring the Duke back home, Harry chose to leave the TARDIS and find a more conventional means of transportation, while the Doctor managed to persuade Sarah to stay. (TV: Terror of the Zygons)

Journey to London
The Doctor and Sarah Jane next landed on Zeta Minor, thirty-thousand years in the future. Accused of killing the crew attempting to mine the planet for alternative sources to replace their dying sun, the Doctor instead found that the planet was the boundary between the normal universe and the anti-matter universe; taking any mineral from the planet would trap a ship there. The crew's leader, Professor Sorenson, had been infected with anti-matter and was fighting off its influence as he kept changing back and forth into a monster that mummified living beings. The Doctor tricked Sorenson into the TARDIS and kicked him into the pool of anti-matter, releasing the expedition ship and restoring the professor to normal. (TV: Planet of Evil)

The Doctor and Sarah next visited London in 1666, with Sarah Jane falling victim to the Black Death. Before he could save her, the Doctor was held responsible for the Great Fire of London by Sergeant George Mullens, despite helping locals to put it out. However, he escaped a lynch mob and cured Sarah back at the TARDIS. (PROSE: The Republican's Story)

The Doctor and Sarah Jane posed as Earth delegates on the planet Farrash, a dying planet that official Earth delegates took no interest in. During a public demonstration, the Doctor was separated from Sarah Jane and became caught up in a protest against "baby killing". The Doctor learned the Leader was sanctioning the abortion of foetuses in order to supply his scientists with the neurochemicals their experiments to save Farrash required. One scientist created a mechanical body that swiftly became a rogue robot and went on a killing spree. The robot fell through the ground and became trapped underneath civilisation. With the Leader killed, the Doctor encouraged the population to work together to find a way of saving Farrash, and left with Sarah Jane. (PROSE: Rights)

Attempting to return to UNIT, the Doctor instead arrived at a priory in 1911, on the future site of UNIT headquarters. There, he had to prevent the last of the Osirans, Sutekh, from escaping his prison in Egypt and destroying the universe. Though unsuccessful in stopping Sutekh's servant, Marcus Scarman, from releasing him, the Doctor was able to delay Sutekh's trip through a time corridor to the priory by moving the corridor's threshold to the far future, thus effectively ageing him to death. Not realising his actions would cause the thermal balance to equalise, the Doctor accidentally set the priory on fire. (TV: Pyramids of Mars)

Holidaying at the ruins of Phaester Osiris with Sarah, the Doctor was kidnapped by archaeologist Edwin Carver, and stopped him and the cult of the Black Pyramid from awakening Horus. He destroyed the Black Pyramid afterwards to prevent Horus from ever returning. (PROSE: Scarab of Death)

After landing near a manor house in 1764, the Doctor nearly drowned in a frozen lake while following giant cat footprints. He was rescued by Rector Adams, and decided to remain when he and Sarah saw a 20th-century double decker bus in the woods. Adams invited them to accompany him to Lady Huntingdon's ball, where the Doctor was reunited with Iris Wildthyme and learnt the bus was actually her TARDIS. He discovered Iris intended to marry off her companion, Edwin Turner, to Lady Huntingdon's granddaughter, Bella, so that she would inherit the estate. When the Rector was killed by a giant animal, the Doctor discovered Huntingdon and Bella were actually shape shifting cat aliens who wanted to steal Iris' TARDIS. Bella turned against Huntingdon, and before Huntingdon could hijack Iris' TARDIS, the Doctor trapped her in a pocket dimension with the use of a Time Lord dimensional message capsule. Afterwards, the Doctor and Iris went their separate ways again. (PROSE: Old Flames)

Afterwards, the Doctor seemingly found himself in a town Sarah Jane had previously visited for a newspaper article. They ultimately found that it was a facsimile of the town, not even actually on Earth, populated by androids under the control of the Kraals. The Kraals' own world had become uninhabitable, leading them to plan on wiping out Earth's population with a virus, then populating the planet themselves. Discovering Sarah had been replaced by an android, the Doctor found and rescued her. With the help of Harry Sullivan and UNIT, the Doctor was able to stop the aliens and rescue the townsfolk the Kraals replaced. (TV: The Android Invasion)

Association with UNIT
After he and Sarah Jane returned to UNIT HQ, the Doctor based himself on Earth, staying at his old cottage and resuming use of Bessie, (COMIC: Death Flower, Return of the Daleks) while Sarah Jane continued working as an investigative reporter. (COMIC: The Hoaxers) However, the two frequently took trips in the TARDIS, (COMIC: The Wreckers; PROSE: A New Life) and were often accompanied by Harry. (PROSE: The Hospitality on Hankus) While working with UNIT, the Doctor started to write a series of educational books called Doctor Who Discovers. The intended title for the series was The Doctor, Who Discovers..., but the publishing company misprinted the title, resulting in the author being mistakenly credited as "Doctor Who". The Doctor completed five books in the series. He began researching the Princes in the Tower for the sixth book, Doctor Who Discovers Historical Mysteries, but left it unfinished. (AUDIO: The Kingmaker)

The Doctor and Sarah Jane investigated strange goings-on at the Vegpro factory near Suffingham. They discovered that the company's founder, Professor Sarric, was a plant-like alien planning to take over Earth with his deadly Sarricoid plants. The Doctor defeated Sarric and had all the Sarricoids destroyed. (COMIC: Death Flower)

Whilst the Doctor was conducting an experiment at his cottage, the TARDIS began to dematerialise. Realising it was being taken away by a time warp, the Doctor managed to devise a way to jam it enabling him and Sarah to board it. As the TARDIS was diverted to a space station in the Milky Way, the Doctor sabotaged the time circuits and fell into a deep coma. To force him to awake to repair his ship, Shazar, the rogue Time Lord who had masterminded the event, threatened Sarah. The Doctor awoke to save Sarah Jane and Shazar revealed his alliance with the Daleks, ordering the Doctor to repair the TARDIS so the Daleks could use it to complete the time circuits of their own fleet of TARDISes. The Doctor tricked Shazar into leaving the station to collect cirenium, as the Doctor anticipated he was quickly tracked down by the Time Lords. The Doctor and Sarah evaded the Daleks until Shazar returned with cirenium, believing he’d convinced the Time Lords that the Doctor was the one allied with the Daleks, which cuadwdcaused the Dalek TARDISes’ Destruction upon being installed. The Time Lords rescued them from the Dalek space station, revealing they’d realised the Doctor’s plan for the cirenium all along. (COMIC: Return of the Daleks)

The Doctor and Sarah arrived on the ark ship Prosperity, where the bio-system had taken over the vessel, and the Doctor gave it the course to a habitable planet for its human charges and fulfil its programming. (PROSE: The Lost Generation)

The Doctor next visited Saxon Britain and lost the TARDIS to the Danes and their god, Woden. Aided by the Saxons, he fought off their invasion army and regained his TARDIS. (COMIC: Woden's Warriors) The Doctor visited Neuronic space and saved his friends from Skizos. (COMIC: Neuronic Nightmare)

Wanting to make changes in the TARDIS, the Doctor constructed an Oscillating Reverberator Unit. However, he ended up transporting Sarah and Harry onto a galleon in space, where they were taken hostage by space pirates. The Doctor managed to land the TARDIS before his companions were thrown into space. (PROSE: Avast There!)

Soon after, the Doctor, Sarah, and Professor Vittorio Levi were taken prisoner on Aquatica by the Medusians, who wanted the TARDIS. Escaping, the Doctor and his two friends met the Phyllosians, the sworn enemy of the Medusian. Embroiled into a war between two kingdoms, the Doctor negotiated peace, and he and his companions decided to spend a number of months on Aquatica before returning to Earth. (PROSE: War on Aquatica)

The Doctor defeated the reptilian Zanons on Zoto in the 41st century, (PROSE: Cyclone Terror) and investigated a Time Cube called "Crystal Z" in the American desert. (PROSE: The Time Snatch)

The Doctor's body was stolen by Rascla, the twisted master of the planet Torm, who intended to unleash a virus onto Mitra B and leave its galaxy vulnerable to attack. Whilst Rascla made plans to dominate the galaxy, the Doctor had secretly taken over Sarah Jane's mind, who, along with Harry, had been hypnotised into helping Rascla. The Doctor endured a brutal psychic duel with Rascla, and Rascla's spirit was destroyed, enabling the Doctor to reclaim his body and make sure Mitra B's galaxy was protected. (COMIC: The Body Snatcher)

Intending to take Sarah and Harry to Phenolyadron, the Doctor was puzzled when the TARDIS was diverted to the planet Peugross in the 37th century. Whilst there, the Doctor, Sarah and Harry discovered a human crew from Earth had mutated into Eye-Spiders, and were commanded by the Doctor's old friend, Xerxes Periopolos. The Doctor reversed the mutation and repaired the rocket, so that the crew could return to Earth. (PROSE: The Eye-Spiders of Pergross)

The Doctor accidentally landed the TARDIS in a swamp on Diamedes, where he meet the gentle, dim-witted Slodes and saved them from swamp creatures. (PROSE: Detour to Diamedes)

During another trip into space, Sarah Jane was kidnapped by the Verulan, and the Doctor and Harry travelled to Earth, which the Verulans had planned to attack, and sought refuge at the home of Geoff Sinton and his family. The Doctor used the Sintons' TV to make contact with the Verulan war marshal, Kathnor. He tricked Kathnor into releasing Sarah, and later destroyed the Verulan ship once Sarah had escaped in the escape pod. (PROSE: The Last Broadcast) After defeating the Verulans, the Doctor and Harry were almost run over by Will Hoffman. (PROSE: The Terror of the Darkness)

The Doctor, Sarah and Harry defeated the Monk when he tried try to take over the world using a weather control device in Russia during the Bolshevik Revolution. (AUDIO: How to Win Planets and Influence People)

Attending another UNIT Christmas party, the Doctor was unable to prevent a Voddod ship from crashing to Earth. Aided by Sarah Jane and Harry, the Doctor raced to find Brac, the crashed alien warrior, before UNIT troops found and killed him. (PROSE: UNIT Christmas Parties: Ships That Pass)

Facing the Scratchman
The TARDIS brought the Doctor, Sarah and Harry to a Scottish island where they had a picnic. They discovered a plague turning the local people into living scarecrows so the Doctor arranged the surviving villagers to shelter in the church whilst he sent Sarah and Harry to fetch equipment so he could create a device to accelerate moth evolution so they would attack the scarecrows. However one of the villagers turned on him and broke his device after the scarecrows indicated he was their target, so he surrendered to the scarecrows hoping to have the villagers spared, unsuccessfully. Sarah and Harry rescued him with the evolved moths when the scarecrows brought him to the beach to meet their masters. Three Cybermen then revealed themselves as the scarecrows' masters, however the Doctor quickly dedued someone else has given them the plague. Their benefactor, the Scratchman, intervened and took Sarah and Harry through a tiny rift into his universe, forcing the Doctor to follow in the TARDIS.

The Doctor endured a series of bizarre situations upon arrival in Scratch's universe, which nearly broke his self-belief until a future Doctor intervened to help him. He confronted Scratchman who revealed he was willing to give the Doctor power in return for him widening the tear to allow him into the universe. The Doctor rejected him so Scratch challenged him to a fight. Reunited with Sarah and Harry, they found themselves in a bizarre mixed game of pinball and chess based on Harry's memories. The Doctor devised a way to divert the balls off the course, winning the game so Scratchman furiousoy sent Harry away. The Doctor quickly deduced Harry's survival and was vindicated when Harry's meddling led to Scratchman's castle falling from the sky. In the ruins he faced the weakening Scratchman again and told him his true fear, which overwhelmed Scratchman so much he consumed himself in his depseration for energy. The Doctor then meditated to summon the TARDIS and departed with Sarah and Harry.

Afterwards the Doctor was snatched away by the Time Lords and brought before the Convocation of Oblivion to explain his actions. He told them of his encounter with Scratchman and shamed them for not facing their fears, walking away freely. He then resumed his picnic with Sarah and Harry where he met the future Doctor again on the beach. (PROSE: Scratchman)

Missions for the Time Lords
Whilst attempting to leave the cottage in Bessie, the Doctor and Sarah found themselves forced to turn back. Deducing the Time Lords were responsible, they returned to the TARDIS which was sent to Dalek-occupied Ercos. There they helped Ticon, a Klim, escape the Daleks. He explained the Daleks were drilling on the planet and together they infiltrated the drilling site, where the Doctor deduced the Daleks were turning Ercos into a giant missile to fire at Earth. When the Daleks sealed the tunnels to the drill, they escaped via an underground river. Back on the surface, Ticon instigated a revolt against the retreating Daleks whilst the Doctor and Sarah reached the TARDIS. Piloting the TARDIS to the shaft, the Doctor sealed it using an explosive resulting in the Daleks’ plan to destroy Ercos failing. (COMIC: The Dalek Revenge)

On another mission for the Time Lords, the Doctor was sent to destroy a space station that held the Bendriggans' virus. However, he and Sarah were accused of murdering a messenger and sentenced to death by Admiral Cosmicon, the Bendriggan commander. The Doctor proved his innocence by sending a message in Time Lord logic to a Bendriggan code expert. But winning their trust was short-lived when many Bendriggans became infected. After watching the Admiral die, the Doctor set the Bendriggan flagship on collision course with the space station, destroying them both and saving the remainder of the Bendriggan race. (COMIC: Virus)

Diverted by the Time Lords again, the TARDIS arrived in Italy in 1944 where the Doctor and Sarah were initially suspected of being German spies. When a German convoy arrived, Father Antonio hid them in his church and revealed it held a number of treasures including a genuine painting by Raphael. Convincing Antonio that he was time traveller by showing him the TARDIS, aided by the Time Lords shifting the TARDIS forward to 1976, the Doctor and Sarah helped Antonio by hiding the church’s treasures onboard when the German soldiers came for them. They took the TARDIS forward it in time to 1948, returning the treasures to Antonio. (COMIC: Treasure Trail) The Doctor and Sarah Jane relaxed back on Earth for a few days afterwards, until the Doctor read about Sir Julian Hubert’s excavation of Hubert’s Folly. Enlisting the aid of the Home Secretary, he rushed to stop the excavation but was too late. He revealed to Julian that he’d helped his great-great-uncle seal up an explosive engine that he’d created, which was now firing energy. Together he and Julian attempted to defuse it but were unsuccessful. Instead they arranged for the military to seal it again with quick-drying cement. (COMIC: Hubert’s Folly)

The Doctor found his TARDIS forced to land on Karn by the Time Lords, as the Sisterhood of Karn had been crashing ships that passed Karn to protect what was left of their Elixir of Life. The Doctor used a firecracker to unplug the crevice the elixir came from, being promptly booted out. He then discovered the evil Time Lord Morbius was being resurrected in a patchwork body. Defeating him in battle of mindbending, the Doctor managed to reduce Morbius to a mindless beast that tumbled off a cliff to his death. However, the Doctor was left severely drained, but the Sisterhood allowed him to drink some their elixir, which restored the Doctor's health. (TV: The Brain of Morbius)

Final adventures with Sarah
Some time after leaving Karn, the Doctor and Sarah arrived in the Devon moorland. They were attacked by a mutated hound and were saved by hunters. They then went on to stop the plans of British inventor Tobias Breckinridge to change the course of human evolution using a Rutan healing salve. (PROSE: Evolution)

While visiting the ancient Roman port of Ostia, the Doctor and Sarah began to investigate an inexplicable case of blindness amongst the wives of powerful merchants, and discovered that it was caused by Marcia, a member of a female-only cult devoted to the Bona Dea. Marcia had been using a device of alien origin to gain important knowledge from other cult members to increase the business of her husband, Aulus Pumidius, thereby elevating her own status. After the Doctor used his sonic screwdriver to prevent the machine from blinding anyone else, Sarah allowed her memories to be recorded by Orbiana, the blind priestess of the Bona Dea. Seeing Sarah's bravery during her adventures with the Doctor, Orbiana resolved to only use the machine to inspire the other worshippers into seeing their own value in the male dominated world. (PROSE: Sarah Jane and the Temple of Eyes)

The Doctor and Sarah took a brief trip to 1930s Chicago to acquire a new fluid link for the TARDIS. (PROSE: The Duke of Dominoes)

At Sarah Jane's request, the Doctor posed as a hostile alien to teach Hiram Lutz a lesson when he refused to donate money for a struggling disabled children's home. (COMIC: The Hoaxers)

The Doctor investigated an abandoned lighthouse in North Cornwall and discovered a gigantic lizard had been killing the local villagers. With no other option, the Doctor was forced to use a naval rocket to destroy it. (COMIC: The Tansbury Experiment)

The Doctor next took Sarah to the circus to watch a performance by the great P. T. Barnum. However, they lost the TARDIS to circus performer Benjamin, who planned to use the time machine as a new magic act called "the Wondrous Box", accidentally transporting the time machine back to various points in the circus's past. The Doctor managed to bring Benjamin to the present, and regained his ship. (AUDIO: The Wondrous Box)

Being summoned by UNIT on behalf of the World Ecology Bureau, the Doctor saw pictures of a pod discovered in Antarctica. The Doctor and Sarah were flown to Antarctica, and found that the pod was Krynoid and had infected Charles Winlett. Outside, they also found another pod, and put it in the freezer. Before they could do anything for Winlett, he mutated further and became aggressive, going on a rampage. While trying to stop the new Krynoid, the Doctor failed to stop Scorby and Keeler, who worked for Harrison Chase, from finding the other pod, and escaping with it.

After the Krynoid was destroyed by Scorby's bomb, the Doctor and Sarah were rescued, and brought back to England. Investigating Chase Manor, the Doctor and Sarah encountered the Krynoid, who had infected Keeler, and had taken control of the body of Harrison Chase, planning to spread its seeds to take over Earth. While fighting Chase, the Krynoid and the plants animated by the creature, the Doctor called in UNIT, who worked with the RAF to destroy the Krynoid and the manor along with it. (TV: The Seeds of Doom)

After a trip to Hollywood, (COMIC: Unnatural Selection) the Doctor and Sarah visited St Cedd's College in 1955, where they encountered Professor Chronotis. During this meeting, the Doctor recommended that Chronotis read The Time Machine. (PROSE: Cambridge Previsited) They were also sighted at the UNIT Research Institute by the Brigadier's seven-year-old daughter, Kate. (PROSE: The Day of the Doctor)

Arriving in 1998 London, the Doctor became involved with stopping the Voracians from using a computer virus that would make all technology sentient and rise up against humanity. He destroyed the virus and chased them off the planet. (PROSE: System Shock)

The Doctor and Sarah visited London to find that the Pescatons were invading Earth. The Doctor discovered their weakness to high-pitched noise and set a trap for their leader, Zor, killing him. When he died, all the other Pescatons died as well. (AUDIO: Doctor Who and the Pescatons)

Using coordinates he obtained from the Grindian exploratory satellite, the Doctor and Sarah landed on the Guerner Transport Ship whose depature from Rimba had been witnessed by the Second Doctor, 23000000 years earlier. Discovering that suspended animation had erased the Guerners' memories, the Doctor helped them avoid destruction at the hands of a Sto-cat, a giant robotic sphinx which had been left on their destination planets millennia earlier by the Kryptolians. (PROSE: The Sleeping Beast)

On Vona, the Doctor joined forces with his old friend, Olak, to break peace between two robotic armies, the Domos and the Yenge. (COMIC: The Rival Robots)

After they failed to aid the survivors of a devastated Earth, the Doctor honoured Sarah's request to go somewhere they could "make a difference" and took her help him to kill a baby destined to grow up into a dictator. However, after the Sixth Doctor failed to kill the baby, the Fourth Doctor realised a different solution, and alerted the baby's mother to the Eighth Doctor's attempt on her child's life. While the Fourth Doctor helped his eighth incarnation escape, the baby's mother realised her love for her child, and decided to raise them better. (PROSE: Categorical Imperative)

Whilst Sarah was shopping, the Doctor waited outside the shopping centre and manipulated cause and effect with a coin, resulting in Sam and Emma exchanging phone numbers. (AUDIO: Chain Reaction)

The Doctor and Sarah were chased by Daleks, but were able to escape due to the Doctor travelling back in time to place items to aid them during the chase after he and Sarah had returned to the TARDIS. (PROSE: Dr. Fourth)

During a trip in space, the Doctor accidentally brought the Helix Intelligence to San Martino, Italy, in the 15th century, where it planned to dominate the human race by using the Brotherhood of Demnos as its agents. Because the agents had been converted into pure energy beings by the Helix, the Doctor tricked the Brotherhood's leader, Hieronymous, into using all his energy until he vanished. Using his mask and cloak, the Doctor posed as him and used a device to drain the energy out of the rest of the Brotherhood, killing them and saving the Earth. (TV: The Masque of Mandragora)

Soon after, the Doctor rescued Piram, a survivor of a Lizardian space pirate attack and helped him take revenge on Skarnus, destroying a barren moon that he had turned into his base. (COMIC: Jackals of Space) On Calderon IV, the Doctor became the target of a revenge attack by a bitter old man whom he opposed in his previous incarnation. (PROSE: The Android Maker of Calderon IV)

The Doctor and Sarah spent nine weeks travelling to the beaches of Geshtinanna. During this time, they became trapped inside a "ghost TARDIS" which was travelling on a parallel course to their TARDIS. (PROSE: Eternity)

Whilst Christmas shopping in 1980s New Zealand, Sarah and many other shoppers were kidnapped, along with a large percentage of turkeys. Investigating, the Doctor discovered the Hazoodians were using turkeys to make alcohol. Realising the humans were being kidnapped by accident, the Doctor returned them to Earth. (PROSE: Autaia Pipipi Pia)

Receiving another summoning from the Brigadier, the Doctor was forced to assist UNIT by investigating alien activities in the Channel Island. (PROSE: Hello Goodbye)

The Doctor and Sarah were present in London during the coronation of Elizabeth II on 2 June 1953, where the Doctor offered a jelly baby to a purple alien in a suit who was subdued by Eva De Ville. (COMIC: Where's the Doctor?)

The TARDIS' steering went out, causing the ship to go back in time forty-five-hundred-million years. The Doctor and Sarah observed Earth, at the time a mass of molten rock, develop into a world with an atmosphere and life. They also encountered Megron, a Lord of Chaos claiming to be ruler of Earth until the Doctor banished him. (AUDIO: Exploration Earth: The Time Machine)

The Doctor made another visit to Vortis, where he found the crystalline Clynex was draining the energy from its surroundings and attracting the Menoptera to their deaths. The Doctor saved them from Clynex by shattering it with his sonic screwdriver. (COMIC: The Naked Flame)

The TARDIS landed in an English quarry, where it was buried by an explosion. The Doctor emerged unscathed, but Sarah was taken ill and so he accompanied her to hospital. There, he discovered she had come into contact with a stone hand and, when Sarah stole the hand and fled, followed her to Nunton Experimental Complex. Her wearing of a ring brought her under the control of Eldrad, a Kastrian scientist. The Doctor used a cooling duct to reach Sarah and brought her to her senses.

Eldrad restored herself using the reactor core. The Doctor agreed to take her back to Kastria, her homeworld, but only in the present, not her home time, as this broke the Laws of Time. On Kastria, Eldrad was injured by an acid-laden booby trap, so the Doctor and Sarah had to conduct her to a regenerator chamber. There she was restored to her male form. Eldrad discovered his people to be dead and asked the Doctor to return him to Earth so he could rule over humanity. Fleeing from him, the Doctor made use of his scarf, with Sarah holding the other end, to trip Eldrad, who fell into an abyss.

Back in his TARDIS, the Doctor received a telepathic summons from Gallifrey and was forced to leave Sarah behind, just as she herself had decided to return home. They both agreed they wouldn't forget one another as Sarah left, (TV: The Hand of Fear) but the Doctor had accidentally left her in Aberdeen, Scotland instead of South Croydon. (TV: School Reunion)

Return to Gallifrey
Discovering that the signal hadn't come from someone he knew, the Doctor returned to Gallifrey, just as it was the time of the election for Lord President, and theorised that the departing President was in danger. Stealing a robe to blend in, the Doctor attempted to prevent an assassination, but ended up framed for murdering the Lord President. To keep himself from being executed, the Doctor declared his own candidacy for Lord President. Believing the Matrix would give him clues as to who was behind this, the Doctor ended up in a mental duel with the culprit.

After finding the assassin, the Doctor learned that it was Goth, another Lord President candidate, who was being manipulated by ; since their last meeting, the Master, with no regenerations left, had degenerated into a rotting corpse. The Master was plotting to use the Eye of Harmony in an attempt to restart his cycle of regenerations by using the Sash of Rassilon to protect himself from the effects of the Black hole that would destroy Gallifrey as a side-effect.

After failing to convince the Master that, since the sash was damaged in the death of the old president, it would put the Master at risk, the Doctor fought him off. Though the Master managed to escape capture, the Doctor left his former teacher, Borusa, to lead Gallifrey as Cardinal, (TV: The Deadly Assassin) though, as the only candidate left, he was still eligible to gain the title of Lord President, even after leaving. (TV: The Invasion of Time)

Meeting his future
Now on his own, the Doctor stopped at the Cathedral of Contemplation, where the Abbess put him to paint frescoes in one of the chapels. He was helped by Jora, a fugitive from the Second Dalek War, and later reached by his tenth incarnation. When the Daleks attacked the Cathedral, the two Doctors brought the pilgrims to safety; then the Fourth Doctor insisted on going and confront the Daleks directly in the Sanctum.

Captured by the Dalek duplicate of Captain Zenna, he was delivered to the Dalek Supreme, who attached him to the main control of the Cathedral and tried to use his telepathy to drive the building down to Earth headquarters. However, even the mind of the Doctor proved insufficient to form a stable connection with the Cathedral; only when the Tenth Doctor joined him at the control, their combined efforts allowed them to move it. The two Doctors first released the pilgrims on a safe space, and then directed the Dalek time corridor to Earth, 5,000,000,000, sending the Daleks to their destruction. Released by Jora, the two Doctors then managed to escape and trap the Dalek Supreme inside the collapsing Cathedral. The Fourth Doctor offered Jora to accompany him, but she refused. He then left after encouraging his future self to be more hopeful. (AUDIO: Out of Time)

Companionless travels
The Doctor landed on the Queen Mary in 1963, during a voyage from Southampton to New York City. He discovered physicist Peter Osbourne had built a time visualiser prototype that was sending ripples backwards and forwards in time, capturing the fragmentary essences of people in the moments of their worst despair. The Doctor destroyed the machine, but the gestalt of spirits remained bound to the ship, with Osbourne included in their number. (PROSE: Ghost Ship)

The Doctor decided not to return for Sarah Jane, fearing he would have to watch her grow old and die. (TV: School Reunion) However, he did visit her to apologies for the way they parted company and to say a proper goodbye, quickly departing afterwards to protect her from any further heartbreak. (PROSE: Farewells)

Arriving in 1990s Tokyo on Christmas Eve, the Doctor celebrated Christmas in the Emperor's Garden with a member of the Divine, an ancient shapeshifter. (PROSE: Ode to Joy)

The Doctor admired the human spirit as he observed the Earth from orbit. (PROSE: Dear Humans)

The Doctor travelled to the planet Penadron, and was set to meet with the Senate until he discovered that they planned to kill him to extract his secret knowledge from his brain. (PROSE: Mystery Message)

The Doctor later attempted to form a band with his three predecessors, but creative differences, and the fact that they all wanted to play the drums, broke them up. (COMIC: Day of the Tune)

The Doctor incurred the wrath of Droge of Gabrielides, who "offered an entire star system for [his] head", (TV: The Sun Makers) helped Mason Vox set up a colony on Agratis, (COMIC: A Rare Gem) and also refused to answer a summons from his first incarnation. (PROSE: Five Card Draw)

Wanting to learn first-hand about history, the Doctor became a taxi driver in London and met architect James Willaker and took him to dinner. He told James about his travels in time, and James inspired him to travel to the building the architect was then working on; Chase Manor. (PROSE: Only Connect)

The Doctor was caught in the destruction of a cemetery in an earthquake, but was saved by Ana Maria Carla Perez de Calixtro. After spending Christmas with her family, the Doctor travelled forty years into the future, and met Ana when she was an old lady so he could take her back in time every Christmas to visit her father's grave. (PROSE: Callahuanca) He then attended a private Christmas party hosted by the First Doctor. (PROSE: The Feast of Seven... Eight (and Nine))

On another mission for the Time Lords, the Doctor was joined by a Craxon called Andric to find a new source of Diloona and they faced a number of perils on a satellite at the hands of the Managans. (COMIC: The False Planet) He next helped Inspector Keel defeat the Zandans, beings that fed on fire, by pouring soot on them and neutralising their heat cells, (COMIC: The Fire Feeders) and forged a truce between the Braggens and their rulers the Kling on Earthos by unmasking the Kling's Emperor as a computer. (COMIC: Kling Dynasty)

While fighting the Cybermen, the Doctor was attacked by time flies, but was saved by his twelfth incarnation. (COMIC: A Stitch in Time)

Finding a strange book, the Dischord Grimoire, in the TARDIS, the Doctor travelled to the Recusary to consult his old friend Ansillon about it; there he was involved in yet another conspiracy involving the Master (in one of his earlier incarnations) and an attempt to build a Parenthesis Book to take control of history. He was framed of murder and arsonry, and only Ansillon's stepping up for him avoided him being sentenced to death. With the help of a librarian, Elanora, the Doctor was able to stop the Master and send him on his way, to fall into the Vortex. (AUDIO: Blood of the Time Lords)

Captured by the Master
The Doctor, along with his six other incarnations, was trapped in the Determinant by, but he was able to create an amorphous being named the Graak to save him and his other selves. The Doctor instructed the Graak to start his mission by finding a radio transmitter in the Third Doctor's laboratory to contact the Brigadier.

After the Graak freed his predecessors, the Doctor began pleading with him to save him, as he was in danger of being "swept away" into an "infinite of nothingness". Later, the Doctor informed the Graak to only enter the Determinant when he was "mentally prepared", as failing the challenge would result in certain death, and instructed him to go to the Zygon chamber to retrieve a Skarasen calling device.

When the Master and the Graak battled in his brain, the Doctor helped the Graak by navigating him around and giving details on the adversaries he encountered. After the Graak defeated the Master, the Doctor was finally freed when the Graak sacrificed its life force to liberate the trapped Doctors. (GAME: Destiny of the Doctors)

Skirmish on Aprilia III
The Doctor arrived on Aprilia III in a parallel dimension, where he met Captain James T. Kirk, Spock, Dr. Leonard McCoy and Scotty. The group had been looking for a lost archaeological team, and had discovered the base. The Doctor offered them jelly babies and used his sonic screwdriver to break the lock the group had been trying to open.

They discovered the researchers standing catatonically, with small cybernetic devices in their ears. Dr. McCoy began to remove the devices and revive the crew, but was interrupted by the arrival of a Cyber-Leader and two Cybermen. A firefight ensued, but the Starfleet phasers were ineffective against the Cybermen. The Doctor used the gold cover from Kirk's communicator to clog the Cybermen's respiration. After the Cybermen were defeated, the Doctor slipped away quietly. (COMIC: Assimilation²)

Travels with Oliver
After travelling with Oliver Day for several months, Oliver got amnesia, which caused him to temporarily lose his memory of his travels with the Doctor. (PROSE: Attachments)

Arriving in an alien marketplace, the Doctor and Oliver met Gravkrom-Vey, owner of the last Monkrah fish in the universe. The Doctor discovered the Monkrah had been wiped out in a civil war with the Manicoll, who also began dying soon after the war had ended, so the Doctor and Oliver helped Gravkrom-Vey release the last Monkrah. (PROSE: Plight of the Monkrah)

Soon after, the Doctor and Oliver went on the trail of the Puppeteer, an evil creature who had followed mankind's progression across the stars, and fed on the countless wars and conflicts of Earth. They followed him to Gondovan, where they met investigative archivist Annajin Valentin. Oliver fell under the Puppeteers control and tried to kill Anna. But the Doctor managed to free his mind, whilst Annajin killed the Puppeteer. Oliver, shaken by his experience on Gondovan, elected to stay behind with Annajin, leaving the Doctor to travel alone with once again. (PROSE: Puppeteer)

Old friends
The Doctor travelled to 16th century America and was hailed as a god by Taric, high priest of the Mandrans, (COMIC: The Sky Warrior) visited William Shakespeare after he had sprained his wrist to help him draft Hamlet, (PROSE: The Stranger, The Writer, His Wife and the Mixed Metaphor) and became trapped in a dreamscape with a servant of the "Master of the Blackhole", which nearly destroyed his mind completely. (PROSE: Master of the Blackhole) He later made several notes about the updates made to Hamlet's soliloquy. (PROSE: Hamlet's Soliloquy)

The Doctor arrived on a submarine that was attacked by an army of Sea Devils. However, before the Doctor could move against them, he unexpectedly encountered the Third Doctor. Keeping his identity secret to protect the timelines, the Doctor helped his previous incarnation to defeat the Sea Devils, and made a quick exit before his third incarnation could discover who he was. (COMIC: Under Pressure)

Soon after, the Doctor reunited with former companion, Liz Shaw. They had dinner and the Doctor took her aboard the TARDIS, and the pair travelled together for a short period of time. (PROSE: Down to Earth)

Summoned to Earth by Brigadier-Lethbridge Stewart's recall device, the Doctor discovered UNIT was facing closure and the pair attended a court hearing in New York to save the organisation, but the Doctor was side-tracked when he discovered the Brigadier did not summon him to Earth. Investigating led him to the Museum of Art, and he was soon held at gunpoint by Robin Oemington, a former spy who blamed the Doctor for the downfall of his career. Robin was killed by police before he could kill the Doctor. However, the Doctor discovered Robin had constructed a bomb capable of blowing up the solar system, and that the deceased spy planned to frame him. The Doctor managed to defuse the bomb at the last moment and successfully secured a bright future for UNIT and the Brigadier. (PROSE: UNITed We Fall)

The Doctor worked alongside Harry Sullivan again to return a peaceful alien home and to also protect it from a ruthless UNIT colonel named Dennis Horsely, who believed that the creature should be killed and experimented on, (PROSE: Mutiny) and attended the funeral of Alistair Gordon Lethbridge-Stewart with all of his other incarnations. (PROSE: The Gift, Shroud of Sorrow)

The Doctor spent a long period of time tracking down Jessica Willamy, who he had met in his second incarnation. He discovered she had been a fugitive for forty years, ever since their last meeting and he saved her from an assassin in New England. (PROSE: Wonderland)

During a visit to London in 1999, the Doctor worked with Harry Sullivan to deal with a new group of Voracians, who had infiltrated the British Government. Unlike the direct military action of the first group that the Doctor had encountered, these Voracians intended to manipulate the government into dismantling the British military by staging a coup and shutting down the army in the aftermath, telling the government that the goal was to divert money into education and medicinal programs when in reality they would use the opportunity to distribute Voractyll-programmed technology more effectively while disguising it as anti-Millennium-Bug software. Having exposed the coup, the Doctor and Harry tracked down the Voracians before they could activate Voractyll, distracting them long enough for the Doctor to infect their own software with the Millennium Bug, causing Voractyll to shut down when it passed through them. (PROSE: Millennium Shock)

The Doctor visited Clio on her fifth birthday to give her a bag of jelly babies as a present, (PROSE: The Glass Princess) and watched Leonardo da Vinci paint the Mona Lisa, thinking the model was a "dreadful woman with no eyebrows who wouldn't sit still". (TV: City of Death) Posing as a Punch and Judy man whilst hunting Cybermats in 1879, the Doctor met Winston Churchill. (PROSE: The Lost Diaries of Winston Spencer Churchill)

Temporary companions
Still travelling alone, the Doctor gained a companion in Miss Young, and the pair went to Scotland in Bessie to meet with Professor McBane, an old friend of the Doctor who had summoned him. McBane revealed that a meteor had crash landed in oil rig waters, and he wanted the Doctor's input on the chance of alien hostility. As the group flew over the area in a helicopter, giant tentacles arose from the sea and began attacking a local ship. The Doctor was able to take a sample of the pink substance from the creature back to the laboratory, where he discovered that it was seaweed contaminated from radiation from deep space brought by the meteorite. Furthermore, the mutated seaweed was attracted to sound, so the sound of the oil rig put it in danger.

The Doctor and Miss Young headed out on a boat, using a sound-emitting gadget to attract the mutated seaweed. A tentacle grabbed the Doctor, but Miss Young cut it off. They lured the mutation into a shallow bay where it couldn't dive and dropped drums of petrol from the boat. After they were flown out of the area, the petrol was lit on fire, killing the beast. Afterwards, the Doctor and Miss Young drove back to the TARDIS for more adventures. (COMIC: The Sea Devil)

The Doctor went to Xenon, where he picked up Milena from the planet. In return for a favour, Milena's father had asked the Doctor to take his daughter on an adventure. The pair went on a mostly peaceful trip, until they were forced to land on an asteroid. There, Milena was possessed by a species known as the Zicons. The Doctor was eventually able to trick them out of her body, and safely dropped her back on her home world. (PROSE: Milena)

New acquaintances
While tracing a historical anomaly, the Doctor met Nyssa, a future companion of his, who travelled back in time with him when she learned that he was going into the past to investigate Roger Bacon, who had been erased as a result of the anomaly that the Doctor was trying to track, Nyssa seeking a time of peace after the chaos of her present. Although their investigations revealed that Bacon's assistant was trying to help him create an elixir of life, the Doctor and Nyssa never learned the reason for this anomaly, their time together ending with the Doctor taking Nyssa back to her time while aware that he would have to take care of the younger Nyssa when she became his companion in the future to avoid causing a paradox. (PROSE: Asylum)

Going undercover at the construction of the Northern Line in 1930s London, the Doctor met Nicholas Clement and located an alien anomaly known as "Kappa 12" under Alexander Palace station. Aided by Nicholas, the Doctor stopped Kappa 12 and a trans-dimensional organisation called "The Union" from destroying Earth, Alpha and Temporalities Beta. (PROSE: The Northern Heights)

The Doctor was recruited by Charles Leyton, director of the Greater European Union's Intelligence Ministry, to investigate media mogul James Baron. On his mission, the Doctor was paired with Susan King, Baron's old flame. The pair discovered Baron had been smuggling weapons into the country and went undercover at Baron's Enterprises. After foiling his plan to seize control of Britain, the Doctor was held at gunpoint by the unhinged Baron, which forced Susan to shoot Baron before he could kill the Doctor. (PROSE: The Baron Wastes)

Alongside a 1939 thief called Jacob Abiathar Earl-Thornton, the Doctor visited Earth in the year 50 million, where they encountered two warring species of robot ants. (PROSE: Earth) The Doctor next tracked down an object that could bring machines, such as vending machines, to life, assisted by a younger woman. (PROSE: My Hero)

The Doctor checked into a London hotel in 1910 and befriended a lift operator, Philip Fowler, who spoke of the King's death and had dark predictions of the future. Investigating, the Doctor discovered Fowler was an alien device to precipitate a revolution on Earth. (PROSE: In Case of Emergencies)

Visiting the wizarding land of Samarkand, the Doctor rescued Al Urd-Din from the pit, causing Al to assume that the Doctor was a magical being. The Doctor discovered the evil Vizier was plotting to marry Al's lover, and trapped him in a World of Shadows. (PROSE: The Nobility of Faith)

The Doctor arrived in the Thousand Year Wood and picked up Figment so they could travel together. (PROSE: Afterwords)

The Doctor met Albert Einstein for the first time, (PROSE: Einstein and the Doctor) and tried to explain the realities of his Theory of relativity, but Einstein insisted that "he knew best." (TV: The Stones of Blood)

First adventures with Leela
The Doctor returned to the planet colonised by the Mordee expedition centuries before, where he found that he was remembered as an evil god called "the Evil One" by the descendants of the colonists. Descendants of the colonist's survey team had become a warrior tribe called the Sevateem, while descendants of the technicians had become a technologically advanced tribe called the Tesh. Infiltrating the "Sacred Heart" of the old Mordee expedition ship with the help of one of the Sevateem, Leela, the Doctor cured the computer Xoanon of his multiple personalities. Leela, wanting to come with the Doctor, forced her way into the TARDIS, becoming his new companion. (TV: The Face of Evil)

The Doctor and Leela uncovered experiments into telepathy undertaken by several university students, which threatened a weakness in the multiverse that was in close proximity, made even worse by a university professor's attempt to create a flawed time machine to undo an event in his past when he beat his daughter to death during an argument. However, due to the interventions of the TARDIS, the damage to the multiverse was repaired, but, as a result, the timeline was replaced by one where the professor reported his crime rather than hiding it. The Doctor noted that he and Leela would forget about the whole affair when they stepped out of the TARDIS, as none of the people they encountered or events they witnessed would have ever existed. (PROSE: Psi-ence Fiction)

On a Sandminer in the 23rd century, the Doctor and Leela were accused of killing members of the crew, and taken prisoner. They later discovered a madman named Taren Capel was murdering the crew, hoping to help his robot "brethren" rule humanity. However, the Doctor turned Capel's reprogramming of the robots against him by using helium gas to make his voice unrecognisable to them, leading to his death. (TV: The Robots of Death)

The Doctor received a summons from the Brigadier to investigate a strange object in Scotland, which he traced to one of the islands in Shetland. While the TARDIS' file on the island identified it as being uninhabited, the Doctor was attacked by Davy McTavit and Murdo Jamieson for being an "offlander", until Joanna Renwick stopped them. Learning that Leela had experienced something whilst rowing, the Doctor theorised that the lights in the sky were not a natural phenomenon, just as Viking artefacts started to attack Joanna. After falling down a hole while trying to find Angus Renwick, the Doctor was attacked by something in Viking armour, but he found his way onto Nardos' ship. After helping Leela to escape the flames, he and Leela travelled back in time accidentally and saw Angus' father during his mission in the Second World War. The Doctor worked out that the ship's defences were causing time to fracture. He was given the "wolf's eye" from a young Angus and used it to go back to the future, and tried to convince Nardos to stop his plans as it would destroy humanity. (AUDIO: The Helm of Awe)

Educating Leela
The Doctor brought Leela to Victorian London and the pair encountered the magician Li H'sen Chang and his master, the self-styled Weng-Chiang, who was actually the 51st century criminal Magnus Greel. With the help of Henry Gordon Jago and Professor George Litefoot, the Doctor was able to stop Greel from using a failed time machine that would have destroyed reality, but when the attempt happened without a crucial part, Greel was caught in an explosion. (TV: The Talons of Weng-Chiang)

After saying goodbye to Jago and Litefoot, the Doctor followed a distress signal that took him and Leela to a country house in Kent in 1895. At the house, the Doctor had to stop Leela from attacking the butler, Jenkins, and told him that his master, Lord Jack Corrigan, had taken a spaceship. After the TARDIS departed, the Doctor traced it to the Nerva Beacon centuries in the future. They landed on the Chandler and joined its crew pretending to be part of its construction crew for the Nerva Beacon. Shortly after boarding the Nerva Beacon, they were arrested by a Drudger and taken to Giles Moreau where he questioned Henry McMullan about the stolen spaceship.

The Doctor worked out that Henry was spreading an infection among the people on the Nerva Beacon. After Jim Hooley became ill with the infection, the Doctor stopped Alison Foster from touching him. He managed to get them back onto supply ship to get a message to quarantine the Nerva Beacon. Shortly afterwards, the Drellerans showed the Doctor that they infected Jack and his colleagues because of Jack's subjugation of their people. He convinced the Drellerans with the help of Alison to give them the vaccine to the stop the infection spreading and cure those with the disease. (AUDIO: Destination: Nerva)

Upon Leela's demand for more teaching, the Doctor brought her to the Movarian Museum, in time for the opening of the new Renaissance section. When they landed, though, they found themselves in an English village, apparently at the beginning of the 20th century. They were greeted by Harcourt, a local scholar, and his servant, Jephson, who seemed to be bent on acquiring knowledge. They found out that Harcourt was a robot built as a speaking database and Jephson was the curator of the new section of the Museum, and wanted to acquire as much knowledge as he could in order to become a real "Renaissance Man". For that reason, he invited several scholars and experts and, with the help of Harcourt, drained their entire memories, transferring them into the database. He managed to drain from Leela her knowledge about hunting and tried to do the same with the Doctor, but he was able to resist the impulse and tricked him by having him store data about a non-existent historical character. When the Doctor revealed the trick, all the world built by Harcourt and Jephson collapsed, leaving only an empty space. (AUDIO: The Renaissance Man)

Deciding that he should take Leela to see her ancestors, the Doctor took her to Roman Britain in 60 AD. Shortly after arriving, they met Boudica when she was being attacked by Festucas and Pacquolas. He was appalled when Boudica killed Pacquolas after he had surrendered. When he told her of Boudica's fate, Leela wanted to change her fate, but the Doctor tried to dissuade her from altering history. He tried to escape back to the TARDIS, but was captured and imprisoned with Bragnar. Boudica knew that threatening Bragnar would cause the Doctor to tell her the future. He managed to escape and rode to Boudica's battle to save Leela from being killed. (AUDIO: The Wrath of the Iceni)

Intending to take Leela to 2015, the Doctor accidentally landed in London in 2025, and noticed a set of anachronistic energy readings coming from the National Museum. He allied with protester Jack Coulson to destroy GlobeSphere Corporation because of their plans to exploit their consumers. Investigating their headquarters, the Doctor discovered that the company had been infiltrated by the Daleks, and that the energy readings were associated with a Dalek Time Ship. He rescued Leela from being converted into a Roboman.

Using the Robotisation mechanism, the Doctor got information from a Dalek that they wanted the energy for their plans and headed for the Moon. He worked out that Damien Stephens was a high functioning Roboman, and also found out that the Daleks were plotting to force the Moon out of Earth's orbit, so that it would cause highly destructive floods and tectonic events that would ultimately engulf the human race. However, the Doctor once again stopped the Daleks by funnelling all the power through their ship. (AUDIO: Energy of the Daleks)

An attempt at a holiday in the English countryside resulted in the Doctor and Leela discovering a plan by to harness a being capable of creating natural wormholes, allegedly to assist the Kraal in their latest invasion of Earth. (AUDIO: Trail of the White Worm) The Doctor discovered that the true goal was to steal a unique battery from UNIT that the Third Doctor had created during his exile and combine the energy from the battery with the radiation on Oseidon to create a new form of radiation that would restore the Master at the cost of destroying the planet. The Doctor was able to convince the Kraal to retreat while the Master was left struggling with an android duplicate of himself that the Doctor and Leela had created to question about the situation. (AUDIO: The Oseidon Adventure)

After being captured by the Sycorax, the Doctor and Leela were forced to fight in their arena with a Catkind named Bathast and an Ice Warrior Grand Marshal named Kyrss. When a Desolation Storm approached the Sycorax's asteroid base, the Doctor and Bathast freed the prisoners while Leela and Kyrss were forced to fight. As the prisoners started an uprising, the Doctor and Leela escaped in the TARDIS after Kyrss sacrificed himself to buy them time. (PROSE: Red Planet)

The Doctor took Leela on holiday on the planet Shontaa, where they battled two Zygons who were engaged in a bitter feud. (COMIC: Rest and Re-Creation) The Doctor and Leela also got lost on Riftan Five for three days, (COMIC: Timeliney Wimey) and then visited Bob Dovie at 59A Barnsfield Crescent in Totton, Hampshire on 23 November 1963. (AUDIO: The Light at the End)

Planning to visit Bexhill on Sea, the Doctor landed the TARDIS near Sissenden Village in 1588, and distracted William Redcliffe so that D'Arcy could escape. He later saved Pincham from being killed as a witch. He met with Nicholas Harney and went with him home to London to rescue D'Arcy from being tortured by Redcliffe. There, he encountered Vituperon who, posing as the Devil, teased him in the delirium. The Doctor was then imprisoned in the Tower of London, but he escaped after being taken to the gallows, having worked out that the imps were copies of Vituperon. After the defeat of the Spanish Armarda, he went back to use the TARDIS to defeat the Vituperon. He went into their lair, with Leela as his anchor, and sealed Vituperon in his realm. (AUDIO: The Devil's Armada)

The Doctor next visited Joshua Douglas and his family, where he re-encountered the imprisoned emperor of the Z'nai, whom he had contained long ago. The Emperor hoped to find an antidote for the plague which Douglas had released to destroy his people. Douglas' daughter freed the Emperor, sparking a resurgence of the Z'nai Empire. For an unknown reason, Leela became the virus' vector, infecting the Z'nai with it. She wiped out the Z'nai except for the Emperor, whom the Doctor imprisoned again. (AUDIO: The Catalyst)

After the TARDIS malfunctioned, the Doctor and Leela found themselves on the tranquil planet of Synchronis, where they planned to relax until the Doctor was attacked and left in a coma, leaving Leela to fend for herself. When he recovered, the Doctor managed to sabotage the ongoing Empathy Games in which Leela was a participant and restructure the society. (AUDIO: Empathy Games)

The Doctor spent a few days in New York in 1856, discussing philosophy and literature with intelligent men. Preparing to leave, the Doctor was persuaded by Leela to attend a séance conducted by the Fox sisters, who summoned the spirit of Neeva, the Sevateem's shaman. (PROSE: Shamans)

When the Time Lords sent him and Leela to Dowcra, the Doctor was captured by Reaver and sent to work with the rest of the prisoners of the Sontarans, working on the clone vats, where he learnt more about the Sontaran invasion from Irving. When he learnt of the human experiment to create a method of instantaneous travel which would be deadly in the hands of the Sontarans, the Doctor thought this was why the Time Lords had sent him to Dowca. He tried to assassinate Strang by using the probic vent, but it didn't work, and the Doctor was sent to help Rosato to complete the portal he was creating. He tried to convince Rosato that wiping out the Sontarans would let the Rutan Host swarm, but his subconscious betrayed him and he accidentally gave Rosato the equations to complete the portal. Because the Doctor wasn't certain that he could make the Sontaran clones good, Leela destroyed all the vats, much to the Doctor's disapproval. (AUDIO: The King of Sontar) He spent two days contemplating Leela's actions, before realising that she only did the Time Lords' bidding. (AUDIO: White Ghosts)

While tracking thefts on shipping transports, Leela was abducted by and brainwashed to believe that she was his personal assassin. Under the Master's control, she nearly killed the Doctor with a Janis thorn, but the Doctor was able to retrieve the antidote and convince Leela to trust him. Afterwards, Leela believed that she would be expelled from the TARDIS, but the Doctor assured her that he didn't blame her for her actions and they discussed Leela's lost father, as the Master's control had included manipulating Leela's memory of him. (AUDIO: The Evil One)

The discovery of a rupture in the Time Vortex drew the Doctor and Leela to a village where a house was apparently plagued by ghosts. Investigating the "haunted" house with the aid of local girl Charlotte, the Doctor learned that the house's owner, Jalnik, came from the year 4000, and was sent into the future by Jalnik's butler, Butler. Learning that Earth in this time was plagued by giant locusts known as the Pantophagen, the Doctor realised that their presence was the result of Jalnik attempting to stage a coup after he discovered the temporal rupture and drew the Pantophagen to Earth. Working with Leela and Charlotte, the Doctor was able to return to the past and seal the original rupture, erasing the chain of events that led to the Pantophagen destroying Earth. (AUDIO: The Foe from the Future)

Continued travels with Leela
At a lighthouse on Fang Rock, the Doctor and Leela discovered a Rutan Host who was planning to make use of the Earth's strategic placement in its race's war with the Sontarans. After all but he and Leela were killed by it, the Doctor destroyed the Rutan by blowing up the lighthouse. (TV: Horror of Fang Rock)

The Doctor and Leela next found themselves on a cyber-frontier world, encountering an army of half-converted Cybermen. Originally planning to help them retrieve a weapon to destroy invading Cybermen, the Doctor sent Leela to gather a resistance and gave the half-converted their emotions back. Colonel Joshua committed suicide after seeing what he had become, whilst the rest dedicated their lives to protecting the planet. (PROSE: One Bad Apple)

Adopting K9
The Doctor, having become the host of the Nucleus, travelled to the Bi-Al Foundation medical centre in the year 5000, where its Swarm spread further, infecting numerous others. The Nucleus brought itself out of the Doctor's body and into the macro world to hatch more offspring. The Doctor travelled to Titan Base, where a hive of Swarm lay. The Doctor mixed the oxygen canisters with the methane atmosphere of Titan, blowing up the base and killing the Swarm. While there, he brought along Professor Marius' robot dog, K9, to fight the Swarm-infected humans. Unable to return to Earth with K9, Marius gave K9 to the Doctor as a gift. (TV: The Invisible Enemy)

Arriving on E9874, the Doctor met with Trexa when she barged into the TARDIS. While meeting the Tarl leader Ergu with Calura and Gethal, the Doctor learned that the Exxilons were creating various complex constructions that would turn multiple other worlds into little more than conduits to power their primary great city, and was asked to share his wisdom with Ergu. They worked out that the Exxilon city used the minds of other races to power itself and that it turned on them in the end. With K9 to disrupt the carvings on the current construct, the Doctor was able to drive the Exxilons away from E9874. (AUDIO: The Exxilons)

Leela temporarily leaves
The Doctor came to know that the Rocket Men put a bounty on his head, and decided to put them out of business once and for all. He instructed Leela to deliver them an olographic duplicate of him as a prisoner, as well as K9. The Doctor then disguised himself as Oskin and got in contact with the Rocket Men leader, Shandar, on their base, the Asteroid. Upon his suggestion, Shandar called upon the Master to propose him a partnership. When the Master arrived, the Doctor manipulated him so that he would kill his duplicate, just before he and K9 started disconnecting the relais keeping the Asteroid steady in space. The Doctor then wore a Rocket Man suit and went off on the Asteroid, where he, Leela and Marshall fought against Shandar and his men long enough to allow K9 to call the Galactic Heritage from the Master's TARDIS. After the Asteroid had been destroyed, Leela expressed her wish to stay with Marshall, and the Doctor bid her a fond farewell. (AUDIO: Requiem for the Rocket Men)

When Marshall told him about Leela's kidnapping by the Master, the Doctor tracked him down to the Quarry Station. There, he found out that the Master had taken control of the local Death Match and was using Leela as his champion. The Master tried to win the Doctor's approval by reminding him about the Game of Rassilon back home, but the Doctor was unpersuaded; enraged, the Master then threw the Doctor into the match as a bonus kill. Inside the game, the Doctor was reunited with Leela, Marshall and K9; together, they located the secret room where the Master cured Leela, ensuring she stayed victorious. The Doctor and K9 reprogrammed the circuits of the station and changed it into teleports, and used them to trap the Master and Kastrella inside the game while they got out. However, Marshall had already been fatally wounded by the Master, and died soon after. The Doctor offered the distraught Leela the chance of coming back to travel with them, and she accepted. (AUDIO: Death Match)

Further travels with Leela and K-9
The Doctor brought Leela fishing on Krelos. (AUDIO: The Fate of Krelos) The two had dinner with Geralk. When they left to go back to the TARDIS, the Doctor pointed at a planet in the sky and said it was Telos, then proceeded to tell Leela about the Cybermen. (AUDIO: Return to Telos)

Whilst fishing on the terraforming Mars, the Doctor, Leela and K9 became caught in a terrorist attack, and the Doctor was mistaken for the leader of the Crimson Dawn, an eco-terrorist organisation. He discovered another organisation, Redpeace, had been working with a lone Ice Warrior to restore the Ice Warriors. After dealing with the rival organisations, the Doctor awoke the cryogenically frozen Ice Warriors on the moon of Phobos and restored the planet to their control. (PROSE: Crimson Dawn)

The Doctor traced the source of a time hole to a group of scientists experimenting on a mysterious skull called Eustace. Much to his horror, the Doctor discovered "Eustace" was actually the skull of a Golden Core, responsible for creating humanity's darker side. Believing it could give them the power to rule the world, a cult used the scientist Thea Ransome as a medium for "Eustace". The cult's plan backfired, as the core simply began transforming them into Fendahl. The cult's leader, Maximillian Stael, committed suicide, preventing them from reaching the quota of thirteen Fendahl. The Doctor blew up their base, killing the transformed humans. (TV: Image of the Fendahl) The Doctor then attempted to destroy the Fendahl skull by firing it into the Canthares supernova. (AUDIO: The Dalek Trap)

Searching for a second Fendahl skull, the Doctor interrupted the first performance of Hamlet and prevented Lord Grathnave of the Erstwhile Collision from obtaining the skull. (PROSE: Hamlet)

Returning to Prague in the 23rd century, the Doctor discovered a race of super-evolving dogs had taken over the city. Taken prisoner, the Doctor, Leela and K9 befriended Ben. Together with the citizens of Prague, they staged a rebellion against the dogs and rebuilt Prague to its former glory. (PROSE: The Dogs of War)

Arriving at Megropolis One on Pluto in the far future, the Doctor learned of the Company responsible for over-taxing the populace. He then discovered that Usurians had previously helped humanity move to Mars and then to Pluto for resources, but planned to leave them behind once Pluto was drained. He overthrew their representative, the Collector, trapping him in a jar in his true form of "seaweed", and set up a better economy. (TV: The Sun Makers)

Taking a homesick Leela to the Heligan Structure, the Doctor found himself on trial for a crime a future incarnation of himself had done to the colonists of the Heligan. However, Chairman Ratisbon insisted on a summary execution, just as the Heligan began manifesting "mobile spores" that attacked the colonists. Realising things were being triggered by an outside source, the Doctor ventured into the Heligan's root ball, and discovered that Director Sprawn had merged with the Heligan to ensure his revenge on the Doctor. Reverting Sprawn's altercations to the Heligan's spores to prune Sprawn out of the Heligan's systems, the Doctor told the colonists that a nearby world would be habitable in ten years and that they should advertise the Heligan Structure as a wonder of the galaxy. (PROSE: The Roots of Evil)

The Doctor took Leela and K9 Agratis to see the Jewel of Fawton and eat a banquet. However, the Jewel had gone missing, and the Judoon had been called in to reclaim it. The Doctor went with his old friend, Provost Mason Vox, and Curator Frez to find Roget, who was suspected of taking the Jewel, while Leela and K9 distracted the Judoon. In the caverns of the Krytuk Valleys, where the Jewel was first discovered, the group discovered Roget as he placed the Jewel, which was the hive mind for the native crystalline species, in its original place, and awoke the creatures. With the Jewel back with its rightful owners, the Judoon's search was called off. While the Doctor was feasting with the Judoon, Adam Mitchell kidnapped Leela and K9. (COMIC: A Rare Gem)

Following a chronal trail left by the Eleventh Doctor as the Tenth Doctor merged their TARDISes together, the Fourth Doctor joined his other incarnations as they stormed Adam's fortress in Limbo to save their friends from Adam and. Though the Master attacked them with Autons, Frobisher was able to free the captured companions, and they helped the Doctors fight off the Autons, as Adam had a change of heart when the Master revealed he intended to use the chronal energies he had stolen across the Doctor's timelines to destroy the universe. After the Master killed Adam as he foiled his plans, the eleven Doctors honoured Adam as a "true companion". (COMIC: Endgame)

Reaching the edge of the universe, the Doctor met the Minyans a species the Time Lords helped evolve, whose destruction of their own planet because of their advancement in evolution led to the Time Lords' non-interference policy. He helped them locate and rescue fellow descendants of their species, taking them a new planet where they could start a better life. While helping them, the Doctor battled against the Oracle, a machine that enslaved the secondary descendants with the aid of robots. (TV: Underworld)

A short while after their adventures with the Minyan, the Doctor landed the ship in Atlantis. Almost immediately after K9 and the Doctor walked out, K9 picked up signals from a nearby vortex manipulator, actually belonging to River Song, before starting to malfunction, speaking only in binary code and then not at all. The Doctor realised that the Crystal of Kronos was creating a time eddy, stranding them. This was part of a wider temporal crisis preventing TARDIS travel across the universe, including for all of the Doctor's incarnations. The Thirteenth Doctor and K9 Mark IV worked to remedy the situation by refueling her TARDIS with vortex energy and connecting all her predecessors' TARDISes through time "like Christmas lights". Once his TARDIS was back online, the Doctor headed back to the Minyan ship to foil an attempt by Daleks from a future Time War to undo his and Leela's good work, with him finding out the nature of the Daleks' scheme and Leela then destroying the Daleks. On the way to New Minyos, he realised he knew about the Time War due to a time echo. On New Minyos, he and Leela foiled a second attempt by the Daleks to use the Mutation Device on the race bank. (GAME: Lost in Time)

Aided by his other incarnations and their companions, the Fourth Doctor, Leela and K9 helped Dan Dare to fight off the Mekon and his army of Treens, Daleks, Ice Warriors, Cybermen, Sontarans and Draconians in 1991. After the Mekon was subdued by a barrage of Red Noses, the Fourth Doctor helped collect donations from the defeated army. (COMIC: Comic Relief Comic)

The TARDIS materialised in the 1940s in what the Doctor and Leela thought to be London but was actually a German training ground used to train Nazi soldiers to infiltrate the Capital City and win the War. The Doctor killed the creature which had been genetically manipulated through experiments in concentration camps. (AUDIO: The Shadow of London)

When turbulence in time took the TARDIS off course, the Doctor and Leela found themselves visiting Cross-Keys Hotel in the middle of a temporal paradox. (AUDIO: The Bad Penny)

The TARDIS crew arrived on the planet Drummond, an Earth colony in the far future where everybody uses handheld computers from morning to night. The Doctor looked into the planet's datastream, Rene.net, when a subliminal command flashed through Rene.net to Drummond's entire population: 'Kill the Doctor'. (AUDIO: Kill the Doctor!) The Doctor cooperated with the police to defeat Sutekh when he returned. (AUDIO: The Age of Sutekh)

Noticing the unreliability of K9, the Doctor and Leela acquired the parts for K9 Mark II. When Leela landed on Westtropi III, the Doctor kept fading out of time, due to the presence of the Time Vampire, which he thought had come into being due to his close proximity of his third incarnation. (AUDIO: The Time Vampire)

Lord President of Gallifrey
Returning once more to Gallifrey, and posing as vainglorious and power-mad, the Doctor sought and attained the office of Lord President from Borusa, who he had left in charge on his previous visit, as part of a scheme to save his home world from an invasion force of the Vardans who had contacted him for his aid. He was unable to confide his intent to double cross the Vardans in anyone but K9 due to the Vardans’ psychic abilities. He was inaugurated as President and crowned with the Crown of Rassilon, painfully connecting him to the Matrix. (TV: The Invasion of Time)

While he was connected to the Matrix, the Doctor gained knowledge of the Timewyrm. Realising he would forget this information, he left a time-delayed message in the TARDIS for himself as a warning. (PROSE: Timewyrm: Genesys)

As part of his plan, he had Leela exiled from the Citadel so that she would gather a resistance force. As he’d planned the Vardans arrived in force after K9 lowered Gallifrey’s transduction barrier, enabling him to track their point of origin and contain it in a time loop. However he was the confronted by an advance party of Sontarans who had used the Vardans’ invasion to gain access to Gallifrey. He retreated into the TARDIS and picked the Sontarans off through traps he set for them. Realising they would be unable to control Gallifrey, the Sontarans sought to destroy it so the Doctor was forced to retrieve the De-mat gun and use it to erase their leader, Stor, from history.

With his homeworld protected and Borusa once again in charge, the Doctor planned to resume his travels. But he learned Leela had fallen in love with a Gallifreyan guard named Andred and wished to remain with him; K9 likewise wished to stay with his "mistress". Though he seemed sad at first to lose both companions, the Doctor quickly pulled out a crate marked "K9 Mark II" from a storage area and grinned to himself. (TV: The Invasion of Time)

After the Presidency
The Doctor arrived on Funworld and encountered Amanda Steele’s team who were hunting a predator who had killed all the planet’s workers. After their psychic Phelan made contact with the predator, the Doctor identified the predator as Vashta Nerada and realised that they’d been antagonised after the park’s owner, Donnelley, revealed forests had been cleared for the park’s construction. He urged the team to abandon the park, which they finally agreed to after Phelan was killed. After the last member of her team died, Steele was left trapped however the Doctor saved her using the TARDIS. They realised Donnelley was returning to Earth in her spaceship, which was likely contaminated with Vashta Nerada. Onboard they found Donnelley dead and managed to return the ship to orbit over Funworld, though Steele died in the process by saving the Doctor from Vashta Nerada onboard by poisoning herself and letting them consume her. The Doctor sent a broadcast from the ship warning that Funworld was unsafe and left, lamenting his inability to save anyone. (AUDIO: Night of the Vashta Nerada)

The Doctor led a revolution against the Master on Glox and cornered him in recording studio, in actuality the Master’s TARDIS. The Master used a broadcast to have one of the listeners to connect telepathically to his TARDIS and become a replica of him which he sent out to face the Doctor and the revolutionaries while he escaped. (AUDIO: I Am The Master)

Arriving on the Starship Future the Doctor discovered the crew had salvaged a damaged Dalek and attempted to warn them about it. He discovered the Dalek was using dormant colonists to breed a new Dalek army and confronted it, during which he learnt a future version of him would destroy the Time Squad this Dalek had belonged to. The Dalek warned him that one of his future selves would turn against everything he believed in and become the “Time Lord Victorious” which he scoffed at, believing the Dalek was simply trying to alter history so he didn’t defeat the Time Squad in the future. The Doctor foiled the Dalek’s plan and left, unaware that it had survived. (AUDIO: Genetics of the Daleks)

Nest Cottage
Before building K9 MKII, the Doctor took up sojourn in a cottage in Sussex called Nest Cottage in the 21st century, where he had adventures with Mike Yates and Fenella Wibbsey. (AUDIO: The Stuff of Nightmares, et al.)

A return to wandering
The Doctor fell out of the TARDIS while it was in flight, and had to cling to his scarf to prevent him losing his ship. (PROSE: Something Borrowed, Something Blue)

The Fourth Doctor was taken out of his timezone by the Father of Time to partake in "the Final Test". He was brought to a TARDIS control console room from his future alongside his second, third, fifth and sixth incarnations, and told that Time had disassembled the control console and set the TARDIS on a course for the heart of the sun, with the Doctors' only hope being to reassemble the control console. Unable to achieve the task due to their bickering, the Doctors were saved when the First Doctor united them in reversing time itself with their pooled temporal powers. As the TARDIS escaped the sun, the Father of Time congratulated the Doctor and sent them back to their own times. (COMIC: The Test of Time)

The Fourth Doctor teamed up with all of his other incarnations to save Gallifrey from destruction at the end of the Last Great Time War, (TV: The Day of the Doctor) even joining them on the surface of the planet to save people from natural disasters that were occurring as a result of their attempt to shift it into another dimension. Shortly after meeting for tea with his other incarnations to celebrate in the Under Gallery, (PROSE: The Day of the Doctor) the Fourth Doctor lost all memory of the events due to the timelines not being synchronised. (TV: The Day of the Doctor)

The Doctor met archaeologist and adventurer Tiger Maratha, and the two briefly travelled together, during which the Doctor made the acquaintance of Tiger's daughter, Priyanka, once offering her a bag of jelly babies. Amongst their adventures included fighting the Deathlings at Angkor Wat. However, Maratha decided to leave the TARDIS and stay on Earth to raise his family. (COMIC: The Swords of Kali)

Returning to Nest Cottage
The Doctor returned to Nest Cottage to celebrate Christmas with Mrs Wibbsey, Mike Yates and Captain. (AUDIO: The Relics of Time, et al.)

Exploits with Ann Kelso
Whilst assembling another K9, the TARDIS notified the Doctor of the use of a warped field damper in 1978 and went to investigate, finding himself saving Trenix and Ann Kelso from Spandrin and learning of an alliance between the Sinestrans and an intergalactic consortium. The Doctor took several Sinestran assassins to a justice planet and gave the eager Ann the opportunity to join him in investigating the mysterious group, one which she accepted. (AUDIO: The Sinestran Kill)

He took her into the future to show her the advancement of society, landing in DrashigWorld on the day of its closure due to a visitor fatality. (AUDIO: Planet of the Drashigs)

The Doctor later took Ann to 1850 Nottinghamshire where they met Lord Byron. (AUDIO: The Enchantress of Numbers) Their hunt for the Sinestrans led them to discover that something was wrong with time. (AUDIO: The False Guardian)

The Doctor eventually determined that he was dealing with the heirs to the conspiracy masterminded by Mavic Chen, who had decided to mount their own campaign of conquest. The Doctor was able to defeat most members of the organisation, but then realised that "Ann" was actually a fake identity of SSS Agent Anya Kingdom, who had been programmed with an alias to ensure that the Doctor would target the right members of the conspiracy. The Doctor was able to expose the deception, but decided to leave Anya, despite her request to travel with him. (AUDIO: The Perfect Prisoners)

Lone travels with K9
The Doctor landed on a Vorgan Space Platform, and the TARDIS was captured by the Vorgs. The Doctor escaped into the depths of the complex, and managed to steal a field generator from a sleeping guard. He used this to deflect the Vorg's laser blasts. While making his way back to the TARDIS, the Doctor was spotted by a squad of Vorgs, who summoned a Mobile Neutron Cannon to shatter the Doctor's force shield. At that very moment, a fleet of battle cruisers arrived out of a white hole and began attacking the platform, as they sought to reclaim ships captured by the Vorgs. The ensuing chaos created enough of a diversion for the Doctor to escape in the TARDIS. (PROSE: Entry 2481/B-3)

Making a bet with Santa Claus that he could deliver presents with his TARDIS during Christmas Eve 1968, the Doctor accidentally overworked his ship until it broke down. Seeking out the crew of the Apollo 8 mission, the Doctor took packages from each crewmember until he was able to repair his TARDIS, and then left to give them the equipment before Apollo 8 launched. (PROSE: Three Wise Men)

Looking for K9
While travelling solely with K9, the TARDIS was caught in a Gravitational Tractor Beam, which shook up the vessel and its passengers. After a moment, K9 disappeared entirely from the ship. Unable to discover where K9 had been sent to, the Doctor went on many travels alone. (COMIC: K-9's Finest Hour)

Arriving in Bethlehem four years after Jesus's birth, the Doctor encountered a time traveller known as the "Fourth Wise Man" and became trapped in a void inhabited by a god-like entity that wanted his brain. The Doctor completed a complex crossword puzzle, which led him to freedom. (PROSE: The Doctor's Cross Word)

The Doctor visited Zaggar-Six, where he came into the possession of multiple Zaggan pound notes. He eventually found his way to the outskirts of a small town in the English countryside on Earth, where he went into a shop to restock up on foods. Inside, he found the "Old" Grubb completely petrified with fear of something coming. At this point, the shop was attacked by a Roman-style robot, which killed the shopkeeper without mercy and attempted to kill the Doctor. The robot malfunctioned after being confused by the Doctor's biology, but the Doctor was soon attacked by reinforcements of robots in the Iron Legion, who shot at him as he entered the TARDIS.

The Doctor learned that he had slipped into a dimension duct to an alternate world where Rome had never fallen and where a vast empire ruled the galaxy. Landing in the middle of a royal ceremony, he met with General Ironicus, who threw him into the Ectoslime after he refused to give him the secrets of the TARDIS. The Doctor was able to avoid it killing him by telling it a joke in its native language, thus befriending it, but the Doctor was enslaved for this and taken on board the Imperial Air Galley. He escaped with the help of ex-gladiator Morris, while also being joined by Vesuvius, a robot with a flame attachment to his head, although Morris suffered a fatal injury and died. In the catacombs, the Doctor activated the genetically engineered Bestiarus and programmed them to start a revolution against Rome.

The Doctor eventually met with what was purportedly Adolphus Caesar's mother Juno, who the Doctor revealed was really Magog, a Malevilus whom had secretly influenced Rome into conquering the galaxy, and reverted to his original form. Magog had the powers of physical manipulation, and tortured the Doctor for his actions—turning his body inside out and twisting the time around his body, as well as other things. The Doctor was able to point a camera at the beast, revealing to the people his true nature and causing them to join in with the uprising. Magog did not care about this, as he knew that he could still force his will over them, and forced the Doctor to take him into the TARDIS, where he was tricked into flicking a switch which flung him into an empty dimension, trapping him for eternity. Back on Earth, the remaining Malevilus were killed by the besieging Bestiarus, Vesuvius was crowned the new emperor and the Doctor left for a vacation in Benidorm. (COMIC: Doctor Who and the Iron Legion)

Partway to Benidorm, however, the Doctor had to force a landing on the planet Zom to repair his time-space stabiliser. In the city of Zombos, he discovered a society where emotions were the only crime, and any signs of emotion were removed by the Harmoniser. The city's police, the Moderators, discovered the Doctor's interference and took him to the Moderator General., where he was attached to the Ultra-Harmoniser—a piece of technology that wiped the mind entirely. Before his mind could be wiped, however, he was saved by the Zom Emotional People's Organisation, who arrived to save the machine's previous victim, Freddy Feel-Good. ZEPO was a resistance group of fighters who had gained emotions, although each member only held one main emotion, which became their name. Deciding that the Doctor had to be one of them if the Brains Trust wanted him wiped, the group decided to take the Doctor with them, helping him fly out of the city on one of their ZEPO fliers. Outside the city in the rebel camp, they introduced each other to him. Their silly personalities and names caused the Doctor to laugh, which the group's bible had predicted their saviour, the Great Emoter, to be able to do. The group soon realised that the Doctor held many emotions and could switch between them easily, making them believe even further that he was the Great Emoter.

At the rebel camp, the Hates, a ZEPO splinter group, had collected a group of blood-eating bugs named Barabara, who they released to eat the Moderators that had found the camp. When the Doctor was bitten by the bugs, they quickly died off, while they quickly ate the Moderators without worry. The Doctor realised that adrenaline, the chemical released by creatures under emotional stress, was poisonous to the bugs—meaning that while ZEPO was safe, those in the city were not. As a large shipment of Barabara the Hates had placed inside the food conveyer began attacking the city, the team sped to warn the Brains Trust of the threat. The Doctor stole the teleportation gear from one of the consumed Moderators and teleported to the Brain Trust.

The Doctor explained the situation to the Brains Trust, who agreed that losing what they had built was more favourable to losing their people. Before they could undo the process however, they were attacked by the Moderator General, who refused to remove emotions to his "perfect society". He killed all of the Trust before being knocked out by the Doctor. Imitating the Moderator General, the Doctor broadcast a message ordering those in the city to reconnect to their harmony booths, which he was able to use to reverse the process. As the people's blood was now poisonous to the Barabara, they instead began attacking the Moderators. The city was left without their totalitarian rulers, leaving ZEPO in charge. The Doctor decided to leave—much to the dismay of ZEPO, who still saw him as his saviour. After a few days of repairs on the TARDIS, he was able to leave, accidentally leaving behind readings of his brain's E-wave patterns. ZEPO decided to use these to repair the citizens' emotions, leaving everyone in the city with the personality, quirks, and emotions of the Doctor. Leaving them behind, the Doctor exclaimed that they would grow out of the phase. (COMIC: City of the Damned)

The Doctor finally tracked K9 down, where he learned that K9 had been grabbed accidentally by a teleportation beam that was meant for him. The tube which K9 had beamed into had no oxygen, meaning the Doctor was meant to suffocate in front of his captors. At this point, K9 had already defeated his kidnappers, much to the Doctor's admiration. (COMIC: K-9's Finest Hour)

Unfinished business at Nest Cottage
After a few months of travelling, the Doctor arrived back in Hexford several months after he left Mrs Wibbsey. (AUDIO: The Hexford Invasion, et al.)

Quest for the Key to Time
After completing repairs on K9, the Doctor was called upon by the White Guardian to find the Key to Time's pieces and assemble it to bring the universe into balance. For his quest, the Doctor was given a new companion by the guardian, a Time Lady named Romanadvoratrelundar, whom the Doctor decided to call Romana. Despite not being too fond of each other, they managed to find the first segment to the Key on Ribos, which was disguised as a piece of Jethrik two con artists were using in their schemes. (TV: The Ribos Operation)

The Doctor and Romana tried finding a segment on the crime-ridden Earth colony Vyga 3. However, it turned out to be a weapon which emitted a fluctuating chronon wave when activated, killing a group of criminals who were trying to obtain it. (COMIC: The Seventh Segment)

While searching for the second segment, the TARDIS was diverted to Ashkellia after a breach in the higher dimensions released a chronometric pulse that disrupted the tracer's ability to find the next segment. Although the Doctor was tricked into reactivating Paul Neville's psychically-controlled castle, unaware that he had the necessary means of controlling it in the form of powerful psychic Huvan, he was subsequently able to prevent Huvan becoming the new host to the power of the Old One known as Valdemar, sealing the breach and allowing him and Romana to continue their quest. (PROSE: Tomb of Valdemar)

They set out to find the second segment on Calufrax, but instead landed on Zanak, where they became caught in the middle of a revolution between pirates, led by the Captain, and the psychically gifted Mentiads, who grew in number each time their planet materialised over another for riches and resources. Defeating the Captain and his nurse, the Doctor revealed to Romana that Calufrax, which was being held as a miniaturised trophy, was the second segment. (TV: The Pirate Planet)

The Doctor and Romana next journeyed to Boscombe Moor, where they found the third segment as a necklace belonging to the intergalactic criminal Cessair of Diplos, who had been posing as an ordinary Earth woman for centuries after she had stolen the segment while it was the Great Seal of Diplos, and used its transformative powers to take on different forms. Entering a ship stuck in hyperspace above a stone circle, the Doctor found her jailers and, as they did not know what she looked like, tricked them into identifying her, and they imprisoned her in the form of a stone. The Doctor then sent them through hyperspace to their intended destination. (TV: The Stones of Blood)

While the Doctor and Romana searched for the Key, they were interrupted by a network of spatial teleportation paths created by a malfunctioning time cabinet intersecting with Earth's ley lines, which were being used by Hsien-Ko. They were forced to disrupt the teleport system while also deflecting Hsien-Ko's attempt to draw Magnus Greel's cabinet into the present day. (PROSE: The Shadow of Weng-Chiang) Afterwards, the Doctor and Romana took a break from searching for the Key. (PROSE: Heart of TARDIS)

Whilst walking in a forest with Romana and K9, the Doctor stepped on a butterfly. (PROSE: Prelude Falls the Shadow)

Later, the Time Lords contacted the Doctor, telling him that they needed him to go on a mission. The Doctor, however, left them after learning that the Brigadier had been captured by a terrorist group. The Doctor discovered that the group had drawn him in to avert a disruption to a pocket universe created by an old experiment. Romana was contacted by the Time Lords, who revealed that this was the disruption they had wanted the Doctor to investigate, as it was actually caused by a TARDIS crashing into the pocket universe, with the Doctor being diverted because it was the TARDIS of his second incarnation. After releasing the Second Doctor from the pocket dimension, the Fourth Doctor and Romana continued their quest. (PROSE: Heart of TARDIS)

Searching for another segment of the Key, the Doctor was imprisoned in a dungeon for theft, but Romana managed to negotiate his release. (PROSE: Pericles)

Looking for the fourth piece, the Doctor and Romana travelled to Norfolk in 2011, where they found the fourth segment as a meteorite which was giving former astronaut Millicent Ferril the power over metal. To stop her from allowing the Conquist to invade Earth, the Doctor was forced to disperse the piece of the key causing it to reform in another time and place. (AUDIO: Ferril's Folly)

While looking for the fourth segment on Tara, the Doctor decided to take a relaxing fishing break while Romana went to look for it. Though successful in finding the piece to the Key, they both were forced into the political power struggle on Tara, as Romana was identical to a princess being held captive by Count Grendel, who wished to use her to claim the throne before his cousin. The Doctor exposed Grendel's plans and went on his way with Romana to continue the search. (TV: The Androids of Tara)

Taking a minor detour to England, the Doctor realised that a series of offensive e-mails being sent to an estate agent's office were the work of the Glarn, who often tried to undermine the morale of the planets they sought to conquer before actually attacking. The Glarn were convinced to retreat after the Doctor persuaded the office workers to send jokes back to the Glarn, forcing them to withdraw. (PROSE: The Glarn Strategy)

The search for the fifth segment brought the Doctor and Romana to Delta III where the Swampies worshipped an overgrown squid called Kroll, who was attacking a human mining base. Putting himself in harm's way, the Doctor found Kroll had swallowed the segment of the Key and was transformed by its properties. Allowing himself to be grabbed by the giant creature, the Doctor was able to use the tracer to reclaim the segment, transforming Kroll back into smaller squids in the process. Reclaiming the piece, the Doctor and Romana returned to search for the last segment. (TV: The Power of Kroll)

The Doctor and Romana investigated a mysterious painting in Kensington, which turned out to be a painting that showed the viewer their death that had been stolen from the Braxiatel Collection. The Doctor decided to take it away from the Art Gallery in which it hung, and destroy it, but the painting was stolen by UNIT Operative Ruth Matheson and placed in the Vault. (AUDIO: Tales from the Vault)

While searching for the sixth segment, the tracer brought the Doctor and Romana to Rome during the time of the Roman Empire. Exploring their surroundings, the Doctor decided to watch the play Luna Romana as a way to confuse the Black Guardian. He had to save Romana from falling off the temple roof and then told her that he knew that the segment that was in Rome was actually the fifth segment. He admitted that he was deliberately avoiding the Sixth Segment as he thought that no-one should have that power, not even the Guardians. (AUDIO: Luna Romana)

Searching for the final segment brought the Doctor and Romana to Atrios, a war-torn planet being attacked by the nearby computer-planet Zeros. There, they met the Shadow, an agent of the Black Guardian. Unfortunately, the final segment was in the form of Princess Astra of Atrios. The Doctor completed the Key, and then quickly separated it back into its original components to prevent the Black Guardian from getting it. Fearful the Black Guardian would return for revenge, the Doctor installed a randomiser in the TARDIS controls, (TV: The Armageddon Factor) having built it from bits and pieces he found in the TARDIS. (PROSE: The Fall of Yquatine)

Hiding from the Black Guardian
On the run from the Black Guardian, the Doctor sent K9 to pilot the TARDIS to one-thousand planets across time and space to lead the Black Guardian on a wild goose chase. Waiting for the TARDIS' return, the Doctor and Romana took up residency in London in 1929, becoming the Lord and Lady of the Manor. After he finished his machine, the Doctor detected alien activity and took Mabel Dobbs along with him as Romana wasn't available. He travelled to Hampshire and found a spaceship in the grounds of a country house, and was attacked after trespassing on the ship. Not knowing that Romana was at the house, he saved her from a Valjax called Lady Florence Bassett, who wanted to take her body. Florence attacked the Doctor for meddling and planned to kill him. After Florence died, he made his way back to London before Romana knew he was missing. (AUDIO: The Auntie Matter)

The Doctor, Romana and K9 visited 22nd century Prague, where the Doctor, with the aid of Gnom Burstein, unleashed the golem he had had trapped in his first incarnation onto the Wronsdehj, forcing them to flee from Earth. As he left in the TARDIS, the Doctor took the golem with him. (PROSE: Life from Lifelessness)

The Doctor, Romana, and K9 encountered a frog-like being named Bolog, who had a fleet of ships at his command hidden on the far side of the moon. The Doctor was able to stop him by sending his ships into orbit around the sun with a banana. (COMIC: Death to the Doctor!)

The Doctor and Romana found themselves embroiled in stopping the Quell from destroying the Warren family through several generations from the late 12th century all the way to the 21st century. (AUDIO: The Warren Legacy)

The new Romana
While repairing K9, the Doctor found Romana had regenerated into Astra's form, much to his displeasure. The randomiser landed the TARDIS on Skaro, where the Daleks were excavating the remains of the Kaled base to restore Davros. The Doctor also faced the Movellans, an android race at war with the Daleks. Having reached an impasse of logic, they both needed someone to reprogram their respective computers for "illogical" movements that would give either side an advantage. Winning the Movellans over, the Doctor allowed them to take Davros in cryogenic custody to await trial for his crime of creating the Daleks. (TV: Destiny of the Daleks)

The Doctor partially bypassed the randomiser to take Romana on a relaxing holiday to Paris, where the Doctor discovered a Jagaroth named Scaroth was splintered into twelve selves throughout time after his spaceship exploded; the explosion's radiation affected the primordial ooze, thus beginning life on Earth. The Doctor, Romana and detective Duggan succeeded in stopping Scaroth from preventing his spaceship from exploding. (TV: City of Death)

After forgetting K9's birthday, the Doctor took him and Romana to a planet made entirely of candy, where he accidentally caused cakes to become sentient. (PROSE: Special Occasions: 1. The Not-So-Sinister Sponge) The Doctor and Romana watched the end of the universe together, after which the Doctor offered her a rolo for Valentine’s Day. (PROSE: Special Occasions: 2. Do You Love Anyone Enough?) Dressed as Santa Claus, the Doctor broke into the Brigadier's house to leave presents for his old friend, with Romana as his helper. (PROSE: Special Occasions: 3. Better Watch Out, Better Take Care) He and Romana returned to the TARDIS to relax after their strenuous day, however the Doctor suddenly found himself turned into a marionette doll. (PROSE: Special Occasions: 4. Playing with Toys)

The Doctor, Romana and K9 attended the Queen's re-coronation, (PROSE: The Dying Days) and visited a conference on Mars. (PROSE: Beige Planet Mars) Due to a fault in the randomiser, the Doctor and Romana found themselves in 2000 Paris, and defeated Taureau the Minotaur, who had been kidnapping humans throughout history to feed on them. (COMIC: The Forgotten)

After discover a white hole in space, the Doctor and Romana were captured by a Kroton ship as it was attacked by Quarks, both being more powerful than they should. When the Ogron Confederation of Planets arrived, the Doctor deduced that each species from coming from different parallel universes, and convinced them to retreat by threatening to bring in the Time Lords. When the Doctor took the TARDIS in after them to find out what caused the rift in the first place, he became trapped in the Void along with seven other incarnations, but was able to work with K9 to send a distress call to the Ninth Doctor. He and the others were able to form a dimensional bridge to allow the Eighth Doctor to escape, and were then joined by the War Doctor, followed shortly by the ninth, tenth and twelfth incarnations, who ventured into the Type 1 TARDIS responsible for the disturbance. Forming a plan with the trapped Eleventh Doctor, the Doctors joined their TARDISes to pacify the Type 1 into a peaceful state and return the universe to normal. (COMIC: The Lost Dimension)

The Doctor later received a distress signal and arrived on Chloris, a lush and verdant world with only small quantities of metals, all of which were controlled by its ruler, Lady Adrasta. The Doctor was sent for execution, but managed to avoid it, deciding to investigate the creature he was supposed to be fed to. He found it to be an imprisoned Tythonian that had been sent by its people to set up a trade agreement with Chloris. Deciding to end Adastra's tyranny, the Doctor allowed the Tythonian to kill her and let a new reign of peace be set up between the two species of the planet. (TV: The Creature from the Pit)

When the TARDIS materialised on the Rock of Judgement, an asteroid prison used by the natives of the Uva Beta Uva system, the Doctor, Romana and K9 became involved in a complex scheme that would allow the telepathic mutant Xais to resurrect herself after her execution, her mind imprinted on a uniquely fashioned "death mask" that would allow her to possess those who wore it once the helicon that made it had been imprinted with her mental pattern. Learning that High Archon Pyerpoint had been attempting to use Xais to set himself up as ruler of the system, the Doctor eventually trapped them both on Planet Five, Pyerpoint dying as he tried to make Xais share the secret of immortality with him and Xais left trapped as her mask was lost and the helicon on the planet left raw and unrefined. (PROSE: The Romance of Crime)

Deciding to return some library books before they became overdue, the Doctor learned of a temporal rift leading to Earth in 1930, which resulted in him learning about the ruthless Zodaal, a criminal from a distant planet who had imprinted his mind into a cloud of radmium, now intended to destroy Earth to channel the power of its destruction so that he could imprint himself permanently onto a new host. The Doctor was able to force his ship to take off after sabotaging Zodaal's equipment, his chosen host committing suicide before he could take control and leaving Zodaal to drift helplessly through space. (PROSE: The English Way of Death)

Trapped in Grey Space with Romana, the Doctor was challenged to a game by two entities. After failing their games, he was erased from existence. However, he was later restored by the First Doctor. (AUDIO: Seven to One)

The TARDIS then arrived on the space liner Empress, which had become locked together with a private ship, the Hecate, after colliding with it upon emerging from hyperspace. The Doctor and Romana met Tryst, who had a Continuous Event Transmuter machine. However, some Mandrels from Eden had somehow gotten on board. (TV: Nightmare of Eden) While fleeing from the Mandrels, the Doctor was approached by Benny Summerfield, who took a green jelly baby with a missing leg from him and disappeared. (COMIC: Time & Time Again) The Doctor later discovered he had been lied to, and Mandrels actually decomposed into the addictive drug vraxoin. The Doctor thwarted the drug-smuggling plan of Tryst and the pilot of the Hecate, separated the two ships, and returned the Mandrels to Eden. (TV: Nightmare of Eden)

Annoyed at the lack of donuts in the TARDIS food machine, the Doctor set course for the Vita Novus Health Spa and defeated Karna, the director of a company dedicated to creating "the Beautiful People", which consisted of slim and beautiful human beings. (AUDIO: The Beautiful People)

The Doctor and Romana landed on the Myriad, which was looking for evidence of the Doctor, as he had previously helped their colony. After exploring the ship, the Doctor discovered that there was a Pyralis prison on the planet the ship was orbiting. After defeating them, he programmed the ship to a habitable planet and told Suri to stop the search for him. (AUDIO: The Pyralis Effect)

After saving eleven planets and two space stations, the Doctor took up autograph collecting. Visiting Notting Hill Gate studio's to meet celebrities, the Doctor met Prince Tarvill, an exile from the planet Frentos. He saved Tarvil from four armies who had come from various points in Fretos's past. After sending the armies back to their original time, the Doctor returned Tarvil to Frentos, at a point in time where no one on the planet had heard of him. (PROSE: The Clanging Chimes of Doom)

Whilst in the middle of conducting TARDIS repair, the Doctor and Romana were caught in the middle of a sacrificial ceremony for a "god" called the Nimon. They discovered that this "god" was actually a parasite alien preparing Skonnos for the rest of its species. The Doctor succeeded in preventing the teleport from bringing more than two extra Nimon before the Nimon killed themselves as an accidental side-effect to their final gambit. With the help of the Anethans originally sent to be life-force sacrifices for the transporter, the Doctor destroyed the remaining Nimon before departing with Romana. (TV: The Horns of Nimon)

The Doctor then tracked down the Great One of Metebelis III, on a council estate on Earth and foiled her plot to avenge her species by destroying Earth. (PROSE: Return of the Spiders)

The Doctor and Romana landed in Budapest in 1980 in order to take in the sights. The Doctor was mistaken for a vampire by Celia Soames after he was caught standing over a dead body, but he proved himself by showing his reflection, and explained to Celia that the wounds on the body weren't made by a vampire. He went with Celia to the labyrinth underneath Buda Castle, where he met with a mysterious being but was arrested for trespass.

The Doctor later went to Anita Kereki's flat to find out what information Romana had discovered. In the flat, he tried to find out from Zoltán Frid why he was attacking the people of Budapest. Frid told him that he wanted information and that he planned to sire the Doctor to get information from the whole universe. He used a hypnotic suggestion which he planted in Celia's mind to kill Frid and cure all his victims. (AUDIO: The Labyrinth of Buda Castle)

Shada
The TARDIS was sent a distress signal from Cambridge in 1979, sent by a retired Time Lord known as Professor Chronotis. (PROSE: Shada) Sources diverge on when and how their trip ended; the Doctor and Romana were kidnapped (TV: The Five Doctors) and then either returned without seeing Chronotis, (WC: Shada) or they were returned and saw the Professor as planned. (PROSE: Shada; HOMEVID: Shada)

While they were on a punt up the Cam, the Doctor and Romana were taken by a time scoop to the Death Zone on Gallifrey, but were caught in a time eddy and failed to arrive in the Death Zone. (TV: The Five Doctors) They were returned to the Cam (HOMEVID: The Five Doctors) either to the time they left (HOMEVID: Shada) or several hours later (WC: Shada) when Borusa was sealed in the Tomb of Rassilon. (TV: The Five Doctors)

In the account where the Doctor returned hours later, he forgot his intent to visit Chronotis, went back to the TARDIS and planned a trip to Brighton. (WC: Shada) He landed on Maruthea, at the heart of the Time Vortex, (COMIC: Party Animals) but quickly left. (COMIC: The Incomplete Death's Head) In this account, he would not know of Shada until his eighth incarnation. (WC: Shada)

According to the accounts where the pair were returned to the moment they left, the Doctor met Chris Parsons and Clare Keightley, who helped him to fight Skagra. Skagra attempted to steal The Worshipful and Ancient Law of Gallifrey so he could break into Shada and retrieve Salyavin from his imprisonment. Without realising that Salyavin had escaped, and was living in retirement under the alias "Chronotis", the Doctor had to foil Skagra's plot, which involved taking Salyavin's power to project his mind into other minds, so he could use it to shift his mind into the minds of all life in the universe, using his Krargs. After defeating Skagra, the Doctor imprisoned him in his own ship, and decided to allow Salyavin to remain on Earth. (PROSE: Shada; HOMEVID: Shada)

After the adventure was completed, the Doctor locked Shada away in a forgotten part of space. He wiped his memory of the events of the adventure so that he would barely remember anything about it, leaving little more than a crude drawing of the planets around where he left it as a hint for its true location. According to this account, the Doctor would not remember anything about Shada until his eleventh incarnation. (COMIC: The One)

After Shada
The Doctor, Romana and K-9 went on holiday to Cimmerian II but was affected by something external which gave him some coordinates. The TARDIS got impounded. He was asked by his old friend Smilax to be an expert witness to contest to intelligent life on the planet Earth. He was told by Skorpios that if he con-testified to being intelligence on Earth he would be killed on galactic law. He worked out that he could get a mistrial by luring Skorpios to kill him. When the Children of Pyxis started to attack him, he managed to get into the witness protection universe with K9. The people of this universe put him on trial and attempted to drown him under water. He learnt about the situation from the Foreman for the Lost. He worked out how the Children of Pyxis could be destroyed. He gave the verdict of the Court case against Skorpios which was to find him guilty to Perigord Trent. (AUDIO: The Doomsday Contract)

Landing in Brighton in 1833, too early for the Brighton Pavilion, the Doctor decided to stay around for its opening. Noticing that there was a waxworks in town, both Romana and the Doctor went to visit it, where the Doctor noted to its proprietress, Mary Barnes, that its tableau of Horatio Nelson was wrong. Investigating Goole, the Doctor found out that he and Marie came from the Slough, and they had come to Earth to experience emotion. He accidentally over-clocked Goole and Marie's androids, causing them to explode. He rescued "Romana" and took her to TARDIS and discovered that Goole was impersonating her. He defeated Goole by freezing him in the TARDIS and left him with Mary Barnes. (AUDIO: Gallery of Ghouls)

The Doctor and Romana were embroiled in a complex con involving eleven of Drax's incarnations, who stole a Blinovitch Limitation Effect limiter and used the Doctor as a fall guy. (AUDIO: The Trouble With Drax)

The Doctor and Romana were asked by the Ra'ra'vis Tigil and Kemos to retrieve a psychic sales voucher stolen by Mrs Oppenheimer-Mason in 1986 New York City. While Romana distracted Mrs Oppenheimer-Mason, the Doctor was able to swipe the voucher from her dog, and return it to the Ra'ra'vis. (COMIC: Time Lady of Means)

After being alerted to a crisis by Sarah Jane Smith, the Doctor found his TARDIS under siege by an pandimensional entity that trapped him inside the TARDIS as it began an invasion of Earth. Using his TARDIS tuner, the Fourth Doctor began a temporal meta-collision with his other incarnations to get them to free him from his TARDIS. While the Doctors argued amongst themselves on the best way to handle the situation, the War Doctor used encoded messages from the Sixth Doctor to stop the invasion of Earth before it began, and the Sixth Doctor installed a way to expel the entity from the Fourth Doctor's TARDIS, ending the crisis and freeing the Fourth Doctor. (WC: Doctors Assemble!)

Taking his basic time-travel proficiency test on Romana's insistence, the Doctor materialised on the G-Lock in 3012, where several locals immediately hailed him as having saved the G-Lock from destruction, even though he'd never been there before. Realising that he was dealing with the consequences of a future trip, the Doctor resolved to go back in time and learn what had happened on his previous visit, even though all available information suggested that he was destined to die saving the G-Lock. After making a second trip to the G-Lock, as well as a trip back to 2815 to investigate the origin of the G-Lock, the Doctor learned that the Beautiful Death was powered by the Arboretans as part of Doctor Koel Paddox's attempts to harness their ability to relive their own lives, but his actions had created a rift in reality that would allow the entity known as the Repulsion, a being of pure death, to gain access to this universe. The Doctor was able to trick the Repulsion into transferring itself into K9, allowing him to then upload the Repulsion into the suicidal control computer ERIC and destroy them both. (PROSE: Festival of Death)

The Doctor visited East Berlin, reunited with Edward Grainger and stopped an alien ambassador from instigating a war between Cuba and America. (PROSE: Checkpoint)

The Doctor and Romana went to an inter-galactic conference, where the Vandelanian ambassador was arguing against research on sub-microscopic species, as delegates on behalf of the Time Lords. He and Romana were held at gunpoint by a Voton spy, who had planted a trigger for a bomb in the Ambassador's voice patterns, intending to kill everyone at the conference and start a galactic war. The Doctor interrupted the conference, enraging the ambassador, and had the Voton arrested. (PROSE: The Voton Terror)

Lone adventures with K9
Now separated from Romana, Doctor and K9 encountered a space amoeba, who fed on time. Time began to reverse, causing the Doctor to drift back through his own past, turning him back to his third, second and first incarnations. The space amoeba took him back to when his first incarnation powered up his TARDIS. However, the two Doctors worked together, and moved time forwards, reducing the entity to a puddle on the TARDIS floor. (COMIC: Timeslip)

Falling through time without K9 or his TARDIS, the Doctor was transported to many places that tested his sanity to the limit. Escaping each trap, the Doctor discovered an entity, who resented him for his constant meddling in the affairs of the universe, was responsible for these events. The Doctor tricked the entity into condemning itself to a lifetime of insanity, which loosened the entity's control over him. (PROSE: The Fear)

On the planet Koblos, the Doctor was put on trial by the Time wardens for crossing an illegal time-zone and sentenced to two-hundred-and-fifty years in prison. Whilst in prison, the Doctor discovered the trial had been set up by a corrupt Time Warden who wanted to sell his TARDIS in the black market. With K9's assistance, the Doctor escaped and stopped him. (PROSE: The Two-Timer)

During a visit to Neto, the Doctor defeated a monster that had hidden away inside his TARDIS ever since he was in his first incarnation. (PROSE: Stowaway)

K9 and Sharon
Investigating a supposed UFO crash landing in a Blackcastle steel mill, the Doctor allied with Sharon Davies to protect Beep, the last of the Meeps, from the Wrarth Warriors. However, he soon discovered that Beep was a dangerous criminal. Enraged that he had been tricked, the Doctor allied with Wrarth Sergeant Zogroth to entrap Beep. He was unable to stop Beep's repaired starship from activating its star drive and leave Earth with Sharon, but reduced its power enough to prevent the destruction of Earth. The Wrarth Warriors arrested Beep and freed Sharon. (COMIC: Doctor Who and the Star Beast)

Attempting to return Sharon to Blackcastle, the Doctor landed inside the space freighter Spacehog in the New Earth System. During an attack on the ship by Werelox, the Doctor was scratched by the leader of the Forty-ninth Werelok Pack, Brill, but K9 stunned him. Infected by the venom in the scratch, the Doctor began turning into a Werelok. Retaining enough of his original mind, the Doctor took a sample of the venom and vanished into the TARDIS with K9. With K9 stopping him from going back before he was cured, the Doctor spent three months fighting off the infection before he created an antidote and returned to his true form, with only ten minutes having passed on board the Spacehog. On the planet New Earth, the Doctor hypnotised Brill and learnt that the Werelox were working for the Daleks.

The Doctor boarded the Dalek battlecraft with K9 and Brill and discovered a room Brill called the Room of Many Centuries. Capturing the Doctor, the Daleks told him that they planned to isolate traits from several creatures in their zoo in their cloning and use the New Earth System as a Dalek breeding ground. After escaping the Daleks, and realising the Room of Many Centuries contained time travel technology, the Doctor returned to the TARDIS and materialised in the room. K9 and Brill cleared the secure room of Daleks, and the Doctor froze the battlecraft, the Daleks and the Werelox in one moment in time and space forever when he disconnected the time-space rationaliser of the time transporter. Sharon decided she was in no hurry to return to Blackcastle, and was having fun in the System. (COMIC: Doctor Who and the Dogs of Doom)

While attempting to educate Sharon in advanced science, the Doctor found the TARDIS being ripped in half. They found themselves in a blank dimension, where a woman with psychic powers called Brimo resided, who created whatever she wanted by drawing in energy from N-Space. The Doctor cut off her source of psychic energy when the TARDIS was stuck in the gateway between N-Space and her dimension, and engaged in a battle of minds, where Brimo slowly ran out of power in the dimension. When Brimo had only enough power for one more move, the Doctor defeated her by making her think of what she feared most, trapping her in the Eternity Capsule. The two then travelled with half of the TARDIS four years into the future to meet with its other half; however, due to a malfunction, both of them aged four years in an instant, as the chrono-compensator was malfunctioning. (COMIC: Doctor Who and the Time Witch)

The Doctor took Sharon to a planet he frequented, and there they met his old friends. Sloth-like creatures were used to create dream states for people to have adventures. Unfortunately, the species had become annoyed at being used like this and began attacking their owners. At the end of the adventure, Sharon chose to stay behind with someone she fell in love with, since she couldn't go back home as a woman in her 20s. (COMIC: Dreamers of Death)

More adventures with K9
While travelling through time and space, the TARDIS was sucked into a vortex which caused it to materialise on an uncharted planet. There, the Doctor discovered a chained up man claiming to be Prometheus of ancient Earth legends. Prometheus had been held in this realm for punishment of giving the "spark of life" to humanity. Released with the help of K9, Prometheus led the team to the planet of Olympus. There, Zues argued that humanity's dark nature was much more devastating than any of their positive exports, leading Prometheus to again steal the spark of life as the team fled in the TARDIS. Zues hastily threw a bolt of lightning at the team, scrambling the ship's controls. Materialising in deep space, Prometheus left from the shuttle. (COMIC: The Life Bringer!)

Final voyages with Romana
Before repairing K9, the Doctor and Romana searched for a vampire on Earth, who had been trying to control himself. When the vampire went out of control, the Doctor was forced to stake him. (PROSE: I Was a Monster!!!)

The Doctor and Romana stopped a psychovore from tricking Romana's first incarnation into a time loop that would allow it to consume Gallifrey, but their victory erased their memory of the events. (PROSE: Said Alice)

The Doctor had dreams where he met his past selves, which he realised meant his regeneration was near, and attended the funeral of Hannah Gites. After confessing to Romana that he was troubled by what would happen after he regenerated, the Doctor offered to take her on a holiday to Brighton. (PROSE: Into the Silent Land)

After their holiday at Brighton, the Doctor took the TARDIS to the Leisure Hive, due to Romana's urging for a technologically advanced place of relaxation. However, during the adventure to repair a rejuvenation machine, the Doctor ended up ageing hundreds of years. A genetically created Argolin, named Pangol, decided to take over, but thanks to the Doctor's interference, his plan to create a clone army of himself backfired as the Doctor was in the machine beforehand, gaining his youth back. However, the Doctor, deciding that he was tired of running from his enemies, had to remove the randomiser in order to repair the machine. (TV: The Leisure Hive)

Arriving on Tigella, a planet he visited centuries earlier, the Doctor was accused of stealing the Dodecahedron, but was saved from punishment when it was discovered someone was posing as him. He discovered Meglos, last of the Zolfa-Thurans, had stolen the object to power a device that could destroy planets. The Doctor stopped Meglos by redirecting his machine's laser back at it, destroying him. While preparing to leave for a new adventure, the Doctor received a message from Gallifrey, demanding the return of Romana. (TV: Meglos)

Trapped in E-Space
While on course to Gallifrey, the TARDIS fell through a Charged Vacuum Emboitment and into a smaller pocket universe known as E-Space. Landing on Alzarius, the Doctor met the Alzarians, who were trying to repair their ship. Romana was bitten by an Alzarian spider, falling into a trance; under its control, she allowed the Marshmen to invade. However, they were driven back out by an increase of oxygen, which was poisonous to them. Studying these species' genetics, the Doctor found that the Marshmen killed the original humanoids and evolved to replace them. Creating an antidote, the Doctor cured Romana and taught the Alzarians how to pilot their ship. During this time, he met a precocious Alzarian boy named Adric, who snuck on board the TARDIS before they left to find a way back home to their universe as there was nothing left on Alzarius for him. (TV: Full Circle)

After discovering Adric had stowed aboard his TARDIS, the Doctor and Romana next arrived on the most technologically advanced planet in E-Space, where they learned of a human ship called the Hydrax that came there several years ago. They met the Three Who Rule, discovering their castle was actually the Hydrax and they were vampires, converted by the Great Vampires' king, an old nemesis of the Time Lords. During the Time of Arising, in which the King would be resurrected and return to N-Space, the Doctor launched an escape craft from the Hydrax through its heart, killing the ancient creature. After this, the Doctor set off to return Adric home, as well as to find a way back into his own universe. (TV: State of Decay)

Around the same time, the Doctor came under attack from another group of vampires and lost enough blood to put his life in danger. The Eighth Doctor, who was travelling through his past to regain his memories, gave his past incarnation a blood transfusion, saving him and ensuring that the Eighth Doctor received all his memories from his fourth life at the same time. (PROSE: The Eight Doctors)

Still in E-Space, the Doctor and his companions spent nine days in an enclosed building called the Structure and freed a system administrator called J from a creature known as "the Encroachment". (PROSE: O, Darkness)

When the TARDIS was attacked by Ballustrans, the Doctor was injured and retreated to the Zero Room in his TARDIS to recover, whilst Romana and Adric were arrested by law enforcer Marni Tellis on suspicion of twelve murders and taken to the moon of Letrus. Once he recovered, the Doctor discovered the Farrian were responsible and, alongside Marni and his companions, foiled their plot to invade E-space and open a CVE into N-space. (AUDIO: The Invasion of E-Space)

On Veridis, the Doctor and Romana died. Adric grew old and eventually used the crystals from the TARDIS to build a time machine, change time and save them. (AUDIO: A Full Life)

The trio discovered the Hermes, a spaceship whose pilot had died attempting to travel through a black hole. They discovered messages from travellers also trapped in E-Space by the CVE, intended for friends and family back in N-Space, but were forced to abandon the vessel as it entered the black hole. (AUDIO: Messages from the Dead)

While travelling through E-Space to take Adric home, the Doctor ended up at the Gateway, a location directly between N-Space and E-Space, and time winds blew into the TARDIS, damaging K9 while he was attempting to land. While at the Gateway, the Doctor found Tharils being mistreated by a man named Rorvik in his desire to leave the limbo between realities. When Rorvik's final attempt to leave backfired, it cost him his life. Upon finding the way home, the Doctor discovered Romana wished to remain to help the Tharils. Saddened, the Doctor agreed to let her do so with K9 as a parting gift. As Adric never had any intention of returning home to Alzarius, the Doctor allowed him to stay aboard the TARDIS and return to N-Space with him. (TV: Warriors' Gate)

Return to N-Space
Back in N-Space, the Doctor was called by the Traken Union's Keeper to assist him in keeping evil away while his power waned from age, and a replacement was found. He encountered Nyssa of Traken and her father, Tremas, when he and Adric were accused of wishing to take the Source for themselves. The Doctor eventually discovered was attempting to steal the Source, planning to use its power to merge with him to get a new body. However, the Doctor turned the tables on him again, leaving the Master to perish in his exploding TARDIS. (TV: The Keeper of Traken)

The Doctor used the TARDIS to exploit a gravitational anomaly to create a link to the black hole which the Hermes had flown into, enabling the vessel to reach N-Space. He and Adric sent the ship on to its intended destination, leaving their own message aboard to explain their role. (AUDIO: Messages from the Dead)

After the Doctor had left K9 Mark II to Romana as a gift, he constructed K9 Mark III, who travelled with him and Adric for a short time. (PROSE: Inter-Galactic Cat, Conundrum, Planet of Paradise, Plague World, Just a Small Problem) However, after a while, the Doctor dropped off K9 at Hill View Road in 1978 South Croydon as a gift for Sarah Jane Smith, (TV: A Girl's Best Friend) much to Adric's dismay. (PROSE: A Boy's Tale) He left a farewell message for Sarah inside K9's databanks. (PROSE: Still Need a Title!)

Nearing the end
While flying a kite with his scarf, the Doctor became entangled in a tree. (PROSE: Possibilies)

Travelling alone to Earth during World War I to investigate a rip in the fabric of time, the Doctor discovered Lawrence Grainger, the father of his old friend, Edward Grainger, had been sent to single-handedly battle an entire Turkish hoard by time-travelling film-maker, Jack Holbine. Realising that Lawrence's death could rewrite Edward and humanity's bright future, the Doctor unwillingly joined forces with Jack to save Lawrence, ensuring Edward's future as one of history's greatest peacemakers was secured. (PROSE: Direct Action)

The Doctor met the crew of the Terrain Survey Vessel Excelsior on UX-4732 and failed to stop them from destroying a giant spider before it could hatch into a butterfly creature, (COMIC: Spider-God) then was briefly held prisoner by a psychopathic soldier who wanted to use the TARDIS as a weapon during the Millennium Wars, (COMIC: The Deal) and failed in his efforts to help the Guardian Angels escape a city populated by vicious cannibals. (COMIC: End of the Line)

When the TARDIS was picked up by the Drifter, the Doctor accidentally reactivated a Mondasian Cyberman stored aboard. When it hijacked the TARDIS and kidnapped the Drifter pilot, Jetsam, the Doctor flew the Drifter to AS4 in pursuit with the other pilot, Flotsam. They saved Jetsam, recovered the TARDIS and stopped the lone Cyberman from reactivating the Cyber-Leader, Zogron, from the ruins of a crashed Cyber-fleet. (COMIC: Junk-Yard Demon)

The Doctor re-encountered Jetsam and Flotsam on a junkyard planet called Grot and helped them to stop gun-runner Joylove McShane from reactivating and taking control of a troop of Cybermen. (COMIC: Junk-Yard Demon II)

The Doctor was contacted by Bernice Summerfield, and told that the Sirens of Time had hijacked the first Gallifreyan experiment of time travel, turning it into a time paradox that was splitting the universe apart. While the experiment had already been stopped by Leela and Romana, the Time Lords were in danger of not discovering time travel. Along with his third, fifth, sixth, seventh and eighth incarnations, the Fourth Doctor was brought to Henlen to serve as one of the six pilots needed to handle the TARDIS prototype, while his first, second and tenth incarnations stayed behind to deal with the possible backlash. The experiment was successful, restoring the correct timeline and the Fourth Doctor was taken back to his own time by Benny. (AUDIO: Collision Course)

Final adventures
The Doctor and Adric travelled to Bellascon where they found two scientists had developed a dangerous form of time travel and encountered Narvin on a mission for the Celestial Intervention Agency to halt the Bellascons' time travel. The Doctor attempted to make a peaceful agreement, however the scientists used their time travel to erase Adric from existence, planning to do so to more of the Doctor's companions to prove their power. After Narvin identified the change to history, the Doctor forced him to use his time ring to correct the timeline, restoring Adric. The Doctor then revealed he'd recorded the scientists revealing the extent of their alterations of Bellason's history for their own gain, threatening to make the recording public unless they surrendered their means of time travel which they agreed to. (AUDIO: Erasure)

Death
Tired of the TARDIS' chameleon circuit being stuck, the Doctor went to Logopolis to obtain the formula needed to fix it. Arriving, the Doctor found a woman named Tegan Jovanka had accidentally boarded the TARDIS during a brief trip to Earth, thinking it was a police box. He also reunited with Nyssa, whilst also meeting a being known as the Watcher; they had a secret conversation and the Doctor learnt the Watcher was a manifestation of his next incarnation and that he would be regenerating soon. Realising his end was near, the Doctor got the formulas from Logopolis and shrunk the TARDIS by accident due to 's interference, but this was corrected. The Doctor then went to the Pharos radio telescope to a broadcast the CVE signal as the Watcher took Adric and Nyssa outside the universe.

After successfully reopening the CVEs, the Doctor's short-lived alliance with the Master ended when the Doctor attempted to stop him from forcing the universe into serving the Master with the threat of weaponising the entropy. Pulling the plug on the radio that powered the dish to do so, the Doctor ended up hanging onto it as the Master rotated the dish. Dangling from the dish, the Doctor experienced visions of past foes before he lost his grip and fell to the ground.

In a daze from the fall, the Doctor experienced visions of the Brigadier, Benton, Sarah, Harry, Leela, K-9 and Romana. When Adric, Nyssa and Tegan gathered around him, the Doctor smiled, telling them that the moment had been prepared for. Shocking everyone present, the Doctor held his hand out to the Watcher, who merged with the Doctor as he regenerated into his next incarnation. (TV: Logopolis)

Post-mortem
When trapped in a dimensionally-unstable pocket universe controlled by Iam and, the Sixth Doctor's morphic print was destabilised, causing him to unwillingly regress back through his previous incarnations as his body sought a stable morphic print. (PROSE: State of Change)

In a bid to detach the Funhouse from the TARDIS in the time vortex, the Sixth Doctor bound the switch that protected the TARDIS' passengers from the changing time fields outside with a string, allowing him to pull it remotely from the limited protection of the Zero Room. As a result, the Doctor immediately began to regress back through his first five incarnations as he made his way back to the console room where, as the First Doctor, he flipped the switch back, restoring himself while trapping the Funhouse in the vortex. (COMIC: Funhouse)

When the Seventh Doctor entered his own mind to confront the Timewyrm, the Fourth Doctor appeared as a ferryman to lead the Seventh Doctor from the Third Doctor's part of the mind into the deeper subconscious to confront his foe. (PROSE: Timewyrm: Revelation)

When the Tenth Doctor was confronted by Es'Cartrss within the TARDIS' Matrix, he summoned the Fourth Doctor, among his other past incarnations, to use their united memories and willpower to take back control of the Matrix. (COMIC: The Forgotten)

During many failed attempts to duplicate the Tenth Doctor, defective copies of all his past incarnations, including the Fourth Doctor, were created instead. (COMIC: Breakfast at Tyranny's)

After the Eleventh Doctor was accused of committing deadly crimes against the Overcast, he brooded in the TARDIS for two days, imagining all his previous numbered incarnations, including the Fourth Doctor, interrogating him over the crimes. When he offered the rational that he always left things better than he found them, they all turned and left him in disgust and disgrace. (COMIC: Pull to Open)

When the Eleventh Doctor was attacked by the Then and the Now on Lujhimene, the Fourth Doctor was among the incarnations seen as the Doctor's timeline was almost destroyed. (COMIC: Running to Stay Still)

When the Eleventh Doctor entered into the T'keyn Nexus in order to defend himself, Matrix projections of his previous incarnations, including the Fourth Doctor, appeared inside it to defend themselves as well. Continuing from the Third Doctor's declaration of preventing "busybodies" from altering history, the Fourth Doctor proudly proclaimed himself a "busybody", but one who would sacrifice his life for the Earth instead of one who would rule or destroy it. When the Eleventh Doctor began to deduce Sondrah's true identity, the past Doctors faded away as Oscar Wilde interfered with the Nexus. (COMIC: Dead Man's Hand)

When Clara Oswald entered the Doctor's time stream, she saw the fourth incarnation among the Doctors that ran past her, with the Eleventh Doctor claiming them to be his "ghosts". (TV: The Name of the Doctor)

After saving Gallifrey from the Moment at the conclusion of the Last Great Time War, the Eleventh Doctor dreamed of himself standing with all his past incarnation, including the Fourth Doctor, as he thought about his search for Gallifrey. (TV: The Day of the Doctor)

While the Twelfth Doctor was on the planet Eed'n, he became infected with pollen from the plants and possessed by the entity that controlled all of Eed'n's plants, but he was able to fight off the possession by summoning the memories of his past incarnations, such as the Fourth Doctor. (COMIC: Petals)

When he was exposed to energy from a time storm, the Twelfth Doctor degenerated through all of his previous incarnations, including the Fourth Doctor. (AUDIO: The Lost Magic)

Undated adventures

 * The Fourth Doctor challenged a computer to ask him questions about Australia, as the Doctor believed he was highly knowledgeable. The Doctor was actually unaware of the harm that pollution was causing to Australia, and so, he decided to go to Australia to help. (TV: Dr. Who For Keep Australia Beautiful)
 * The Fourth Doctor and Azmael had an encounter in which Azmael drank so much that the Doctor had to throw him into a pool to sober him. (TV: The Twin Dilemma)
 * The Fourth Doctor visited the Vega Station and won millions of plaudits in the casino. (PROSE: Demontage)
 * River Song met the Fourth Doctor, writing in her diary that he had a whole room just for his scarves. She had his memory wiped with mnemosine recall-wipe vapour so the timeline would remain intact. (GAME: The Eternity Clock)
 * On a Thursday in the summer of 1966, the Fourth Doctor visited Andy Warhol to have his face added to a portrait of eleven incarnations of the Doctor. (PROSE: The War of Art; COMIC: The Girl Who Loved Doctor Who)
 * The Fourth Doctor visited the Tantalus Eye. (PROSE: Engines of War)
 * The Doctor and Romana had dinner with Albert Einstein. (AUDIO: Collateral)
 * The Fourth Doctor became acquainted with Tovin, the leader of the Planetary Council of Restovan, while helping Clinician Claire Mills build a vault to contain genetic samples. (PROSE: A Master of Disguise)
 * The Fourth Doctor once reminisced on his battle with the Daleks on Vulcan after his regeneration into the Second Doctor. (AUDIO: The Power of the Daleks)
 * The Fourth Doctor once took the Brigadier to Jupiter. (AUDIO: The Auton Infinity)

Aborted timelines
When the Faction Paradox altered events to cause the Third Doctor to regenerate on Dust, (PROSE: Interference: The Hour of the Geek) the Fourth Doctor went on to combat the Eight Legs, (PROSE: The Blue Angel) but was only able to halt their eventual conquest of the universe. (PROSE: The Ancestor Cell)

In a timeline created by 's usage of the Anti-Genesis codes, the Fourth Doctor, Sarah and Harry were ambushed by the Master's Daleks upon arrival on Skaro, exterminating them. (AUDIO: Shockwave)

Under the influence of the Valeyard and the Dark Matrix, the Fourth Doctor was corrupted into destroying the Daleks at their very beginning. This timeline was negated when the Seventh Doctor defeated the Valeyard and released the Dark Matrix from his control. (PROSE: Matrix)

In an alternate timeline created by the Discordia, the Doctor had a passionate romantic relationship with River Song that began in his first incarnation, having married her by his fourth incarnation. When he learned that the only way to defeat the Discordia was to dismantle his timeline, the Doctor admitted that he was afraid to lose River, but was reassured that they would meet again in another timeline. (AUDIO: Someone I Once Knew)

In a negated timeline, the Doctor and Leela met the Eighth Doctor's companion, Charley Pollard, when she appeared aboard the TARDIS. As he had detected temporal disturbances in the Time Vortex, the Fourth Doctor realised that Charley was one of his companions from the future. He then met the Eighth Doctor himself and they both discovered was plotting their undoing by removing their TARDIS from history. After Charley and Leela vanished, the Doctors were caught in the explosion of the Fifth Doctor's TARDIS, but were saved by the Sixth Doctor. Once a plan to stop the Master was conceived, the Fourth Doctor went to keep the Master distracted with the Eighth Doctor, and, once the Fifth Doctor had ensured that the TARDIS would not explode, joined his other seven incarnations in preparing to time ram the Master's TARDIS. However, rather than kill the Master, the First Doctor instead turned off the automatic distress actions, which had brought all of the Doctors to the pocket dimension and triggered the TARDIS' destruction, making it so none of that had happened. (AUDIO: The Light at the End)

At two different points in the Doctor's fourth incarnation, one during his time travelling with Leela and another during his adventures with Romana's second incarnation, the TARDIS picked up the signal of a temporal distorsion coming from the planet Henlen, and the Doctor went to investigate. With the Doctor and Leela in a thick jungle and the Doctor and Romana in an ever-changing city, the Doctors and their companions were pursued into a refuge where they found writings in ancient Gallifreyan, and realised they were in the TARDIS prototype that was used for the first experiment of time travel by the Time Lords, and that they were being chased by the original six pilots, who explained that the experiment was sabotaged by the Sirens of Time.

They turned into the starting point of a massive temporal paradox, which was splitting reality apart, and which trapped the pilots into a time loop. They begged the Doctor to stop the experiment and kill them, but he refused. The leader then chose to have the experiment fail himself, thus causing Time Lords never to discover time travel. As a result of his choice, the Doctors, Romana and the TARDISes were erased from time, and Leela was left to die at the hands of the Sirens. However, these events were later cancelled when the paradox was resolved. (AUDIO: Collision Course)

When the Cybermen allied with Rassilon to take over history, (COMIC: Supremacy of the Cybermen) the Doctor was confronted by a cyber-converted K9 while facing the Cybermen in a mansion, (COMIC: Prologue: the Fourth Doctor) and was then ambushed by the Cybermen. This timeline was eventually unwritten by Rassilon and the Twelfth Doctor. (COMIC: Supremacy of the Cybermen)

While travelling in E-Space, the Doctor arrived on the planet Veridis, where scientists had created a machine that could bring the dead back to life, this discovery completely destabilising society as everyone clamoured for their loved ones to be brought back from the dead. The Doctor was able to destroy the machine, but this was only possible when he and Romana sacrificed themselves to destroy it. Adric was left to make a life for himself on Veridis as the TARDIS decayed and K9 ran out of power, but when he began to experience dreams of the destruction of N-Space in the Doctor's absence, Adric developed his own time machine to go back and undo the events of the Doctor's death so that he could live to save the universe again. (AUDIO: A Full Life)

Parallel universes
In the Warrior's universe, the Doctor was persuaded by Sarah Jane to complete his mission to avert the Daleks' creation by destroying the incubation chamber. He, Sarah and Harry went to retrieve the time ring but were confronted by a surviving prototype Dalek which exterminated his companions and mortally wounded the Doctor. The Doctor was extracted by Narvin who informed him his actions had led to a Time War and the Daleks still existed. Narvin supplied the Doctor with an elixir so he could regenerate, with the Doctor choosing to become a warrior to face the Time War. (AUDIO: Dust Devil)

In a parallel universe where the Valeyard defeated the Sixth Doctor in the Matrix, the Valeyard went on to try to stop his fourth self’s trip to Logopolis in order to prevent its destruction and benefit from the resources. When he tried to stop him, he accidentally time-rammed his younger self’s TARDIS, along with the Master’s TARDIS, destroying them both. (AUDIO: He Jests at Scars...)

Personality
Seeing all sapient lifeforms are his "kith", (TV: Pyramids of Mars) the Fourth Doctor would instinctively put his own wants aside to go against all the odds to protect even his enemies from harm, (TV: Revenge of the Cybermen, The Seeds of Doom, The Invisible Enemy, Underworld) regardless of their social standings, (TV: Warriors' Gate) wishing that the peoples of the universe would just "get along". (TV: Full Circle) Prone to mood swings, (PROSE: The Roots of Evil) he could be pedantic at times, often acting erratically in crisis, reacting to others with witty wisecracks and constantly changing his direction of speech, with the Sisterhood of Karn remembering him as "the prattling Doctor, full of idle questions", who often strayed from the matter at hand. (AUDIO: Sisters of the Flame)

He delighted in keeping both friends and foes alike off guard with oddball humour and curious pranks, often playing the fool to lull his opponents into underestimating him, (TV: The Invasion of Time, City of Death) but he genuinely believed that there was "no point being [a] grown-up if you [couldn't] be childish sometimes". (TV: Robot) He always tried to stay "one step ahead of [his] enemies", (TV: The Talons of Weng-Chiang) as he was "a very dangerous fellow when he [didn't] know what [he was] doing." (TV: Destiny of the Daleks) However, when in an emergency, the Doctor would get straight to the point and ask only the most important questions. (TV: The Ark in Space, Genesis of the Daleks, Pyramids of Mars, The Deadly Assassin)

He thrilled on seeing new sights, (TV: The Robots of Death) claiming he "wouldn't sleep at night" if he never learnt where he had been, (TV: Destiny of the Daleks) and delighted in getting himself into trouble, (TV: Genesis of the Daleks) often delivering the most frightening of news in a cheery tone and with a smile on his face. (TV: Terror of the Zygons, The Seeds of Doom, Horror of Fang Rock)

Although he was generally peace-loving and kind-hearted, the Doctor would react with explosive fury when provoked. (TV: The Sontaran Experiment, Pyramids of Mars, The Brain of Morbius, The Seeds of Doom, The Pirate Planet, Full Circle) He "always [got] rude when [he was] trying to cover up a mistake", (TV: Planet of Evil) and could indulge in cultural insensitivity when feeling short-tempered. (TV: Horror of Fang Rock)

The Fourth Doctor thought himself as being "a wise and wonderful person who want[ed] to help", (TV: The Power of Kroll) and enjoyed being the centre of attention, sometimes getting someone to ask him questions solely so he could show off his intelligence by answering them. (TV: The Talons of Weng-Chiang) He believed highly in himself and his brainpowers, (TV: Robot, The Ark in Space, The Invisible Enemy, The Invasion of Time) though was not completely devoid of modesty. (TV: Genesis of the Daleks, The Face of Evil, Destiny of the Daleks) He could get so deep in thought that he completely drowned out the world around him. (TV: Robot, The Masque of Mandragora, The Hand of Fear, The Stones of Blood)

Viewing "one solid hope [as] worth a cartload of certainties", (TV: Warriors' Gate) the Doctor held a strong determination, believing that there was "no such word as can't", (TV: Robot) that "nothing [was] hopeless", (TV: The Seeds of Doom) and that there was "always a way out" of a situation. (TV: The Armageddon Factor) He would openly antagonise his enemies as an act of defiance, (TV: Revenge of the Cybermen, The Brain of Morbius, The Sun Makers, Underworld) though would also charm someone in order to get them to open up for him to extract needful information. (TV: Robot)

He could be literal-minded, (TV: The Seeds of Doom, The Stones of Blood, Nightmare of Eden) and tried to "always accept the unexpected". (TV: The Leisure Hive)

As he felt his regeneration nearing, (PROSE: Into the Silent Land) the Doctor became more sombre and weary at the universe, (TV: Logopolis) preferring sitting back and relaxing than adventuring, (TV: The Leisure Hive) and becoming more vulnerable and less defiant towards peril, (TV: Meglos, Warriors' Gate, Logopolis) even being willing to return to Gallifrey when the Time Lords summoned him, (TV: Full Circle) though he was also bitter towards the lack of control he had over his life. (TV: Logopolis) He also had less fear for consequences, such as removing the randomiser and forgoing its protection from the Black Guardian's revenge due to feeling he was no longer a threat to him. (TV: The Leisure Hive)

Viewing it as "a free cosmos", (TV: Robot) the Fourth Doctor held a consistently anti-authoritarian attitude, with little tolerance for the bureaucracy of military protocol and police procedures, (TV: The Seeds of Doom, The Talons of Weng-Chiang, Nightmare of Eden) seeing himself as a free agent who was "just having fun", (TV: Nightmare of Eden) but held a begrudging respect for the White Guardian. (TV: The Ribos Operation)

Not only was he more inclined towards a solitary existence, (TV: The Face of Evil, The Ribos Operation) such as wishing to be left alone when he had a task to complete, (TV: The Sontaran Experiment) the Doctor also emphasised his distance from humanity, (TV: Pyramids of Mars) though also stated that he found mankind to be his favourite species, (TV: The Ark in Space, The Masque of Mandragora) describing them as "indomitable" for having "survived flood, famine and plague" and "cosmic wars and holocausts", (TV: The Ark in Space) but also acknowledged that when they "[got] together in great numbers, other lifeforms sometimes suffer[ed]". (TV: The Invisible Enemy) He also generally maintained his distance from the Time Lords, and resented that they were capable of controlling his travels whenever they pleased, (TV: Genesis of the Daleks, The Brain of Morbius, The Creature from the Pit) as he "[didn't] like not knowing where [he was] going to turn up next". (TV: The Leisure Hive)

He was almost completely devoid of fear, reacting unfazed to threats of pain, (TV: The Sun Makers, City of Death) and assassination attempts, (TV: Robot, The Android Invasion, The Robots of Death, The Talons of Weng-Chiang) friendlily greeting threats to his safety. (TV: The Sontaran Experiment, Terror of the Zygons, The Android Invasion, The Talons of Weng-Chiang, The Stones of Blood, The Androids of Tara, The Creature from the Pit, The Horns of Nimon) However, he did fear the powers of the Wirrn, (TV: The Ark in Space) Sutekh, (TV: Pyramids of Mars) the Fendahl, (TV: Image of the Fendahl) and the Black Guardian. (TV: The Armageddon Factor) He was also afraid of losing his own sanity. (PROSE: The Fear) When it seemed he was doomed, he resolved to accept his fate, lamenting the long life he had lived (TV: The Power of Kroll) and the friends he had with him. (TV: The Horns of Nimon)

He liked to drink ginger beer (TV: The Android Invasion) and lemonade, (PROSE: Eye of Heaven) and eat oranges, (TV: The Masque of Mandragora) doughnuts, (AUDIO:  The Beautiful People) and kebab. (PROSE: The Brain of Socrates) Aside from jelly babies, he also liked aniseed balls and humbugs. (AUDIO: The Circus of Doom)

He liked bumblebees, (TV: The Robots of Death) "concise answers", (TV: City of Death) ghost stories, (TV: State of Decay) punting, (TV: The Five Doctors) tigers, (AUDIO: The Circus of Doom) butlers, (AUDIO: Destination: Nerva) badgers, (AUDIO: The Sands of Life) and cows. (PROSE: Psi-ence Fiction)

Among his favourite times was 1911, (TV: Pyramids of Mars) and he cited the Megatherium as being one of his favourite animals. (PROSE: The Doctor Who Dinosaur Book) He also had a great appreciation for art and antique furniture. (TV: City of Death)

He "hate[d] goodbyes", instead preferring to "just slip away quietly". (TV: Robot) He also disliked guided tours, (TV: The Seeds of Doom) the colour white, (TV: The Invisible Enemy) "gimmicky gadgets", (TV: The Ribos Operation) swimming, (PROSE: Last Man Running) celery, (AUDIO: The Beautiful People)and bow ties. (PROSE: The Roots of Evil)

The Doctor had little patience for "religious gobbledygook" (TV: The Face of Evil) and "superstitious rubbish". (TV: The Talons of Weng-Chiang) He also tried to avoid being certain of things, as he thought it "a sign of weakness", (TV: The Face of Evil) as there was "enough uncertainty in the universe" for one to "never guess unless [they had] to." (TV: Logopolis) He considered failure to be "one of the basic freedoms". (TV: The Robots of Death)

He looked down on computers, deeming them to be "sophisticated idiots" due to how they "[did] exactly what [someone told] them [to do] at amazing speed[s]" while being "very difficult [at] stop[ping] [from] obeying the original order" if told to stop, (TV: Robot) and also admonished them for lacking imagination. (TV: The Invisible Enemy)

He refused to believe in ghosts, (AUDIO: The Foe from the Future) admired the Peanuts comics, (PROSE: Psi-ence Fiction) and considered his lucky numbers to be 7 (TV: The Power of Kroll) and 740,384,338. (TV: The Creature from the Pit) He enjoyed playing games such as draughts (TV: The Talons of Weng-Chiang) and chess. (TV: The Sun Makers, The Androids of Tara)

Despite his charm and offbeat humour, the Fourth Doctor could be intensely brooding, serious and even callous at times, (TV: Pyramids of Mars, The Seeds of Doom, The Deadly Assassin, Horror of Fang Rock) and would keenly scrutinise his surroundings even when playing the fool. (TV: Genesis of the Daleks, Revenge of the Cybermen, Destiny of the Daleks) He was not against taking a life in extreme circumstances, (TV: The Sontaran Experiment, The Brain of Morbius, The Invasion of Time, The Ribos Operation, The Armageddon Factor, Meglos) but would scold Leela for unnecessary killings. (TV: The Face of Evil)

In his darker moments, the Doctor threatened to deactivate Davros' life-support machine to coerce him into destroying the Daleks, (TV: Genesis of the Daleks) fatally electrocuted an attacking Tesh under Xoanon's control, (TV: The Face of Evil) handed Maximillian Stael a gun with the knowledge he would use it for suicide without much convincing, (TV: Image of the Fendahl) and seemed to have nothing against Leela killing random attackers, as long as she kept quiet about it. (TV: The Talons of Weng-Chiang) He was also willing to sacrifice himself in order to kill Davros via an explosive device in an attempt to prevent the Daleks harnessing their creator. (TV: Destiny of the Daleks)

Though he was much less inclined to use physical violence than his predecessor, the Fourth Doctor would react aggressively if he had no alternative but to defend himself. (TV: The Seeds of Doom, The Deadly Assassin, Nightmare of Eden) However, he would try to see if he could reason with his opponents before he resorted to force, (PROSE: Doctor Who and the Genesis of the Daleks) and would try to ensure that only those that deserved it were harmed by his actions. (PROSE: The Roots of Evil)

While he voiced a dislike for guns, (TV: Pyramids of Mars) and claimed he would never use one, (TV: The Seeds of Doom) he was willing to use the likes of the De-mat Gun and Earth firearms if necessary, (TV: The Seeds of Doom, The Deadly Assassin, The Talons of Weng-Chiang, Image of the Fendahl, The Invasion of Time) though preferred to improvise a non-lethal way of escaping a situation, (TV: The Face of Evil) making a point to never carry a weapon so as not to give reason for people to harm him. (TV: The Robots of Death)

Nevertheless, the Doctor still had a strong moral code, such as confronting J.P. Kettlewell about how the ends never justified the means, (TV: Robot) telling Sorenson that scientists "buy [their] privilege[s] to experiment at the cost of total responsibility" for the outcome, (TV: Planet of Evil) and admonished harming an innocent for science as nothing short of "coldblooded murder". (TV: Full Circle) When ready to destroy the Daleks before the creation, the Doctor hesitated when he realised he would be no better himself than the Daleks if he committed genocide against them. (TV: Genesis of the Daleks) He was also appalled at the actions of the Captain, (TV: The Pirate Planet) and refused to listen to Tryst's attempts to justify drug-running in order to fund his scientific work, simply telling him to go away. (TV: Nightmare of Eden)

However, when the situation called for it, the Doctor could be ruthless in how he acquired results, (TV: Revenge of the Cybermen, The Face of Evil) and become particularly brutish in how he subdued his opponents. (TV: The Seeds of Doom) He did not take kindly to his friends being physically attacked, (TV: The Face of Evil) and also scolded a Tharil for unprovokedly knocking down a servant. (TV: Warriors' Gate) He also despised how greed drove people to complicate a situation. (TV: The Seeds of Doom)

The Doctor was not above the occasional act of hypocrisy, such as telling Harry Sullivan that it was a waste to throw something away, immediately before disregarding a piece of metal that had saved his life. He also told Harry it was "a mistake to clutter one's pockets", despite he himself keeping a large variety of things in his own pockets. (TV: The Sontaran Experiment) He later took an instant liking to Romana's second incarnation when she mimicked his dress sense, despite previously telling her that "external appearances weren't important". (TV: Destiny of the Daleks) He also chastised Bernice Summerfield for her apparent strange sense of priorities while under threat, (COMIC: Time & Time Again) and was unwilling to admit to any wrongdoing on his part. (TV: The Sun Makers)

He was also not averse to deliberately angering his companions as a motivation for them to achieve a task to prove him wrong, (TV: The Ark in Space) nor was he above winding then up on occasion, such as fooling Leela into playing with a yo-yo for an extended period of time, with her believing it was a form of magic, (TV: The Robots of Death) or causing Romana to panic when he pretended to be corrupted by the Key to Time. (TV: The Armageddon Factor)

The Fourth Doctor would affectionately call his other incarnations his "dears". (WC: Doctors Assemble!) He thought his third incarnation was "arrogant", (PROSE: Old Flames) and an "incorrigible show-off", (PROSE: Categorical Imperative) but thought that his first incarnation was a "slyboots". (WC: Doctors Assemble!)

When he came across a statue of the Eleventh Doctor, the Fourth Doctor criticised his future self's nose and bow tie, and also expressed shock of his use of the word "cool." (PROSE: The Roots of Evil) However, when he met his eleventh incarnation in person, he found that he got along well with him, (AUDIO: Babblesphere) and also easily cooperated with the Eighth Doctor. (AUDIO: The Light at the End)

While the Fifth Doctor thought of his fourth incarnation as being "a careless freewheeler who thought he was invincible", (AUDIO: Excelis Dawns) the Eighth Doctor remembered his fourth incarnation as a "casual bohemian" who "dared to take on the evil that stalk[ed] the dark". (PROSE: The Eight Doctors)

Because he did not like the responsibility of looking after them, (TV: The Ribos Operation) the Fourth Doctor would rarely invite others to travel with him, a majority of his companions inviting themselves aboard the TARDIS, (TV: Robot, The Face of Evil, State of Decay) or having someone else persuade the Doctor to let them join him. (TV: The Invisible Enemy, The Ribos Operation, Logopolis) Nevertheless, the Doctor had a close friendship with his companions, and would be crestfallen when they left him. (TV: Terror of the Zygons, The Hand of Fear, The Invasion of Time, Warriors' Gate)

He considered Sarah Jane Smith and K9, and implicitly Leela, to be his best friends. (TV: The Seeds of Doom, Underworld) However, he viewed Harry Sullivan as an imbecile, (TV: Revenge of the Cybermen) and believed that any intelligence that Harry showed was entirely due to his influence. (TV: The Ark in Space)

Younger in appearance than his previous incarnations, the Fourth Doctor found himself drawing closer to his companions than he might have previously. (TV: School Reunion) He tended not to display such feelings himself, being mostly oblivious to other people's attractiveness, believing that telling Countess Scarlioni that she was "probably beautiful" was a compliment, (TV: City of Death) although he acknowledged that Romana was attractive in her first incarnation, (TV: The Pirate Planet) and even kissed her second incarnation. (PROSE: The Well-Mannered War) The Doctor felt a close connection with Romana, due to her being a Time Lord with ideas like his, and was even tempted to cease travelling to be with her. (PROSE: Notre Dame du Temps)

Unlike his predecessors, the Fourth Doctor did not maintain a close working relationship with UNIT, keeping his distance from the organisation except for a handful of occasions, reacting with anger and disdain whenever he was recalled back to Earth by the Brigadier. (TV: Terror of the Zygons, Pyramids of Mars)

The Fourth Doctor "usually[ got] on terribly well with children." (TV: Full Circle)

Commander Stevenson openly wondered if the Fourth Doctor was "quite right in the head", with Harry Sullivan agreeing that he had his "absent minded moments", (TV: Revenge of the Cybermen) and Richard Dunbar asking if he was "quite sane". (TV:The Seeds of Doom) Sarah Jane Smith, when comparing him to his immediate predecessor, likened the Fourth Doctor to an "older brother in for the weekend and in a spot of bother". (PROSE: Still Need a Title!)

Leela described the Doctor as being "very difficult sometimes, but he [had] great knowledge and gentleness." (TV: Image of the Fendahl) According to K9 Mark I, a number of people described the Doctor as "the most insufferably arrogant, overbearing, patronising bean tin." (TV:The Invasion of Time) Adric described the Fourth Doctor as "unpredictable, intimidating and enigmatic, but brilliant". (AUDIO: Psychodrome)

In her first incarnation, Romana diagnosed him with having "massive compensation syndrome", (TV: The Ribos Operation) stating that he was "capricious, arrogant, self-opinionated, irrational, and [didn't] even know where [he was] going", (TV: The Armageddon Factor) while her second incarnation would admit in private that he was an " incredibly resourceful and intelligent person". (PROSE: The Well-Mannered War)

referred to Fourth Doctor as "the bohemian, [and] the wanderer" who was keen to "abandon his roots" and thus "abandoned his sense". (GAME: Destiny of the Doctors) When the Eighth Doctor had a tarot card reading, the Fourth Doctor was identified as "the Fool". (PROSE: The City of the Dead)

After seeing himself being observed by the Watcher, the Doctor became aware his end was nearing, adopting a resigned mood while vowing to stop, eventually losing the strength to keep his grip on the Pharos Project radio telescope's gantry, and fell to his death. As he lay dying, the Doctor spent his last moments thinking of his past companions, and then explained to his present friends that the moment of his regeneration had been prepared for, with a serene glance and a final grin. (TV: Logopolis)

Habits and quirks
The Fourth Doctor would often have jelly babies with him, and offered them as a greeting or peace offering. (TV: Robot, The Ark in Space, The Face of Evil, The Robots of Death, The Talons of Weng-Chiang, Image of the Fendahl, The Sun Makers, The Invasion of Time, Destiny of the Daleks, Nightmare of Eden, The Horns of Nimon) His personal favourites were the orange coloured jelly babies. (TV: The Invasion of Time)

The Fourth Doctor would also let out aloud, "Ah", when he came to a realisation, (TV: Robot, The Sontaran Experiment, Terror of the Zygons, The Hand of Fear, The Deadly Assassin, The Invasion of Time, The Pirate Planet, The Armageddon Factor, The Horns of Nimon, The Leisure Hive) noticed something of interest, (TV: The Ark in Space, Genesis of the Daleks, Planet of Evil, The Brain of Morbius, The Face of Evil, The Talons of Weng-Chiang, The Invisible Enemy, Image of the Fendahl, The Ribos Operation, The Stones of Blood, City of Death, Meglos, State of Decay) needed to explain himself, (TV: The Ark in Space, The Stones of Blood, State of Decay) or as a response to someone's explanation. (TV: The Face of Evil, The Robots of Death, The Invasion of Time, The Ribos Operation, The Stones of Blood, The Androids of Tara, The Armageddon Factor, Dr. Who For Keep Australia Beautiful, City of Death, The Creature from the Pit, Meglos, State of Decay, The Keeper of Traken, Logopolis) He would say, "Ah, there you are", when he noticed that someone had entered his presence or where someone was. (TV: Genesis of the Daleks, Terror of the Zygons, The Androids of Tara, The Horns of Nimon)

He would often say, "come on", when instructing his companions to follow him, as he believed saying it marked him as "the one who leads". (TV: Image of the Fendahl) He would also say, "come along", for a similar reason. (TV: Robot, Genesis of the Daleks, The Brain of Morbius, The Seeds of Doom, The Talons of Weng-Chiang, The Stones of Blood)

The Doctor often talked to himself, (TV: Robot, The Ark in Space, Pyramids of Mars, The Face of Evil, The Invasion of Time, The Stones of Blood, State of Decay) or acted like he was interacting with someone that wasn't there, (TV: The Face of Evil, Image of the Fendahl, The Invasion of Time, Dr. Who For Keep Australia Beautiful, The Creature from the Pit, Warriors' Gate) with Sarah Jane Smith stating he did so "mostly because [he was] the only person who [knew] what [he was] talking about". (TV: The Ark in Space)

He would say, "well...", whenever he was about to explain something, (TV: The Ark in Space, Terror of the Zygons, The Brain of Morbius, The Hand of Fear, The Face of Evil, The Invisible Enemy, Image of the Fendahl, Underworld, The Invasion of Time, The Stones of Blood, City of Death, The Leisure Hive, The Keeper of Traken, Logopolis) and would often interrupt himself with a, "still...", when attempting to explain something and wanted to elaborate on what he was talking about. (TV: Robot, The Ark in Space, The Pirate Planet)

Whenever he heard something he didn't like, he would shout, "what". (TV: Genesis of the Daleks, The Brain of Morbius, The Talons of Weng-Chiang, The Invisible Enemy, The Sun Makers, Underworld, The Invasion of Time, The Ribos Operation, The Pirate Planet, The Androids of Tara, Dr. Who For Keep Australia Beautiful, Destiny of the Daleks, City of Death, Nightmare of Eden, The Horns of Nimon, The Leisure Hive, State of Decay, Warriors' Gate, The Keeper of Traken)

When reaching a conclusion, he would utter, "of course". (TV: The Ark in Space, Revenge of the Cybermen, Terror of the Zygons, Image of the Fendahl, The Pirate Planet, The Stones of Blood, The Armageddon Factor, Destiny of the Daleks, Nightmare of Eden, The Horns of Nimon, The Leisure Hive, Meglos, State of Decay, Logopolis) When met with a concept he rejected, he would describe the ideas as "rubbish". (TV: The Sontaran Experiment, The Hand of Fear, The Deadly Assassin, The Sun Makers, The Ribos Operation, The Pirate Planet, The Armageddon Factor)

The Doctor would say, "splendid", when celebrating a positive outcome, receiving good news or describing a place he liked, (TV: The Ark in Space, Revenge of the Cybermen, Pyramids of Mars, Image of the Fendahl, The Pirate Planet) and often quoted literature. (TV: Revenge of the Cybermen, Planet of Evil, The Android Invasion, The Face of Evil, The Robots of Death, The Talons of Weng-Chiang, Horror of Fang Rock, The Power of Kroll, State of Decay, Warriors' Gate)

He would often ask others if they were listening to him, (TV: The Android Invasion, The Seeds of Doom, The Invasion of Time, The Armageddon Factor) and would tell people to "shut up" when he was concentrating. (TV: Terror of the Zygons, The Face of Evil, The Sun Makers, Underworld, The Invasion of Time, The Stones of Blood, Destiny of the Daleks)

He frequently called those who annoyed him with their perceived poor planning and clumsiness an "idiot", (TV: Robot, The Ark in Space, The Deadly Assassin, The Androids of Tara, City of Death) and would often describe an inhumane adversary as an "unspeakable abomination". (TV: The Sontaran Experiment, The Brain of Morbius)

The Fourth Doctor was prone to boggling his eyes out while flashing his upper teeth in a grin. (TV: Robot, The Ark in Space, Genesis of the Daleks, Revenge of the Cybermen, Terror of the Zygons, The Seeds of Doom, The Masque of Mandragora, The Deadly Assassin, The Face of Evil, The Robots of Death, The Talons of Weng-Chiang, The Sun Makers, The Invasion of Time, The Pirate Planet, Destiny of the Daleks, City of Death, The Creature from the Pit, Meglos, State of Decay, The Keeper of Traken)

When he was not pushing back the ends of his coats to put his hands in his trouser pockets, (TV: Horror of Fang Rock, Image of the Fendahl, Underworld, The Ribos Operation, The Power of Kroll, The Armageddon Factor, Destiny of the Daleks, City of Death, The Creature from the Pit, The Horns of Nimon, Dr. Who For Keep Australia Beautiful) the Doctor would instead rest his knuckles on the pockets' edges. (TV: The Ark in Space, Genesis of the Daleks, The Android Invasion, The Brain of Morbius, Horror of Fang Rock, The Sun Makers, The Stones of Blood, The Armageddon Factor) Other times, he would place his hands in the pockets of his coat, especially with his burgundy jacket. (TV: The Leisure Hive, Meglos, Full Circle, State of Decay, The Keeper of Traken, Logopolis)

The Doctor tended to run his hand through his hair when concentrating on something, (TV: The Ark in Space, Genesis of the Daleks, Pyramids of Mars, The Seeds of Doom, The Masque of Mandragora, The Invisible Enemy, The Invasion of Time, The Stones of Blood, The Armageddon Factor, City of Death) or to calm himself after moments of intensity. (TV: Revenge of the Cybermen, The Masque of Mandragora, The Pirate Planet, The Androids of Tara, The Creature from the Pit)

When in thought, he would scratch at his thumb with his teeth. (TV: Robot, Planet of Evil, Pyramids of Mars, The Android Invasion, The Creature from the Pit) To allure a sense of mystery, the Doctor would often tap his nose when keeping secrets. (TV: Robot, The Brain of Morbius, The Creature from the Pit)

When relaxing, the Doctor tended to put his feet up on a ledge and lean back, often placing his hat over his face as he dowsed off. (TV: Robot, Terror of the Zygons, The Seeds of Doom, Image of the Fendahl, The Invasion of Time, The Androids of Tara) He tended to lightly smack himself when he came to a realisation. (TV: Robot, The Invasion of Time, The Armageddon Factor, State of Decay)

The Fourth Doctor also started a trend of talking to the TARDIS, (TV: The Deadly Assassin, The Robots of Death, Image of the Fendahl, The Horns of Nimon) constantly showing affection for his magnificent machine by kissing it and caring for it when it got damaged. (TV: The Invisible Enemy, The Invasion of Time, The Ribos Operation)

When complimenting his female companions' achievements, the Doctor would say, "good girl". When confused, he would give a quiet, "eh". He frequently rubbed his index finger under his nose. He often whistled to himself. He would shush people to get them to be silent. He would sometimes react with dread to a name, only to then admit he had never heard of the person. He frequently said, "I see", when responding to someone. He would pull at his face when in thought. He sometimes drooped his face.

The Doctor would play with a yo-yo to relax or help determine new environments, (TV: The Ark in Space, Revenge of the Cybermen, The Android Invasion, The Brain of Morbius, The Seeds of Doom, The Masque of Mandragora) and also carried a small telescope that he sometimes used to assess his surroundings. (TV: City of Death, State of Decay)

According to one account, the Fourth Doctor always carried a piccolo on his person, telling Sarah that he "always played the piccolo when [he was] nervous" to "relieve the tension". (AUDIO: Doctor Who and the Pescatons)

Skills
Much like his immediate predecessor, the Fourth Doctor was very physical, being talented at evasive manoeuvres, (TV: Robot, Revenge of the Cybermen) an excellent runner, (TV: Genesis of the Daleks, Terror of the Zygons, The Seeds of Doom) and a skilled hand-to-hand fighter, (TV: The Seeds of Doom, The Masque of Mandragora, The Talons of Weng-Chiang, Logopolis) being capable of withstanding levels of pain that would normally kill a human. (PROSE: The Romance of Crime) He was also capable of rendering someone unconscious with a single blow, (TV: Genesis of the Daleks, Planet of Evil, The Seeds of Doom, The Hand of Fear, The Power of Kroll, City of Death, State of Decay, The Keeper of Traken) and was briefly able to tussle with a Mandrel. (TV: Nightmare of Eden)

Showing incredible accuracy, the Doctor was able to effortlessly throw a gun to Harry with a baton, (TV: Genesis of the Daleks) hit a bullseye on a dart board, (TV: The Android Invasion) strike a strand of rope with a crossbow, (TV: The Face of Evil) throw an axe at Magnus Greel's distillation machine to free Leela, (TV: The Talons of Weng-Chiang) and land his hat on a Dalek eyestalk. (TV: Destiny of the Daleks) He could also gather information from his surroundings to accurately deduce a situation. (COMIC: Under Pressure)

He was also shown to be a highly skilled swordsman, (TV: The Masque of Mandragora, The Androids of Tara) even when using a club as a substitute blade. (TV: The Sontaran Experiment)

The Fourth Doctor possessed telepathic powers, allowing him to project his mind over long distances to communicate with other telepathic users. (TV: The Pirate Planet) Due to his "complex mind", he was able to immunise himself from other telepaths. (TV: The Invasion of Time) He was also able to overpower the Second Morbius in a mindbending duel, though his victory left him severely weakened, with only the Elixir of Life being able to revive him. (TV: The Brain of Morbius)

Claiming to be a master hypnotist, (TV: The Talons of Weng-Chiang) the Fourth Doctor was able to use hypnosis on people with simple eye contact, (TV: Terror of the Zygons) by laying his hands on their temples (TV: The Hand of Fear) or with well-chosen vocal commands. (TV: The Face of Evil, The Sun Makers, The Invasion of Time) Other times, the Doctor would instead use a fob watch to hypnotise someone. (TV: The Talons of Weng-Chiang, The Ribos Operation)

He could repair an android. (TV: The Androids of Tara)

He could check a pulse with his knee. (PROSE: The English Way of Death)

The Doctor could read with incredible speed, detect the level of immuno-agents in blood by its smell, (PROSE: The English Way of Death) and see through cloaking-fields. (PROSE: Managra)

The Doctor could still drive Bessie, (TV: Robot) was able to commandeer and ride a horse with ease, (TV: The Masque of Mandragora) and could pilot an aircar. (TV: The Pirate Planet) He once admitted to Sarah Jane that, he could easily control the destination of his TARDIS if he really wanted to, but that he preferred to only do so in moments of importance. (PROSE: Evolution)

The Doctor could speak Mandarin and Cantonese, among other dialects, (TV: The Talons of Weng-Chiang) such as Swahili. (AUDIO: Trail of the White Worm)

Like several of his incarnations, the Fourth Doctor's pockets appeared to be dimensionally transcendental, as he carried a large array of bizarre items in his pockets. (TV: Robot, Genesis of the Daleks, Revenge of the Cybermen, The Talons of Weng-Chiang) He could also hold his breath for an extended period of time by using a technique taught to him by a Tibetan monk, (TV: Terror of the Zygons) and was talented with sleight of hand pickpocketing. (TV: The Ribos Operation, City of Death)

If his mind came under attack, the Doctor could force himself into a healing coma. (TV: The Invisible Enemy, The Invasion of Time) He could judge character keenly, almost instantly knowing whom not to trust. (TV: The Power of Kroll, City of Death)

The Doctor could also easily draw caricatures of people, (TV: The Deadly Assassin) perform magic tricks, (TV: The Talons of Weng-Chiang) produce a scream powerful enough to shatter glass, (TV: The Power of Kroll) write decryption algorithms for computers, (PROSE: System Shock) and play poker. (PROSE: The Drosten's Curse)

Appearance
Standing at 6'4", (PROSE: The Romance of Crime) the Fourth Doctor was notable for having large, expressive blue eyes, a large hooked nose, a round chin, bright white teeth and a large head of wild curly brown hair, (TV: Planet of the Spiders, Robot) leading him to frequently be described as being "all teeth and curls". (TV: The Five Doctors; WC: Shada, Doctors Assemble!; PROSE: The Touch of the Nurazh; COMIC: The Lost Dimension) He had short, light brown hairs growing on his arms. (TV: Robot)

By the time he was given his quest for the Key to Time by the White Guardian, the Doctor's hair had started to turn grey, and he had acquired a small scar on his upper lip, (TV: The Ribos Operation) which was made worse after he banged his face on the TARDIS control console, (TV: The Pirate Planet) though it soon faded. (TV: The Stones of Blood)

Upon first seeing his reflection, the Doctor lamented that "nothing [was] perfect", and that he had to "take the rough with the smooth", but thought his "nose [was] a definite improvement", though remained unsure about his ears in comparison. (TV: Robot) He eventually came to think of himself as being attractive. (AUDIO: The Power of the Daleks)

Li H'sen Chang described the Fourth Doctor as "tall with wide pale eyes and hair that curls like the ram", (TV: The Talons of Weng-Chiang) with Mena describing him as a "tall curly-headed humanoid". (TV: The Leisure Hive) Adric also called the Doctor a "tall man with curly hair and a silly scarf." (TV: State of Decay) Professor Frederick Marius remarked that the Doctor looked like a "space vagrant", (TV: The Invisible Enemy) while Paul Magrs thought that the Fourth Doctor resembled Tom Baker. (PROSE: Bafflement and Devotion)

The First Doctor described his fourth incarnation as the "taller chap with the teeth and the scarf", (PROSE: Five Card Draw) while the Sixth Doctor called him the "tall one with the teeth and the dark mass of curly hair". (PROSE: The Shadow in the Glass)

When Affinity took on the Fourth Doctor's appearance, the Twelfth Doctor noted that his fourth incarnation's "eyes bulged alarmingly above tombstone teeth". He also doubted that the "battered hat jammed down over a madness of brown curls and an improbably long scarf displayed any sort of style." (PROSE: Silhouette)

Main attires
The Fourth Doctor's most distinctive item of clothing was a series of long, rainbow-styled scarfs that varied in length and pattern formation, (TV: Robot, Image of the Fendahl, The Ribos Operation, Shada) which had originally been knitted for him by Madame Nostradamus, (TV: The Ark in Space) though he also owned a yellow and green striped scarf. (COMIC: Comic Relief Comic) His dark curly hair was often partially hidden by a floppy brown fedora. (TV: Robot)

Aside from his scarf, the Doctor's first outfit consisted of a rust-orange corduroy blazer with elbow patches, a dark brown cardigan with diamond shapes adorning the front, a white dress shirt, an emerald green skinny tie, ankle-high leather shoes and baggy grey tweed trousers (TV: Robot) held up by braces. (TV: The Ribos Operation) He later switched his jumper for a checked-styled waistcoat and discarded his tie altogether, (TV: Terror of the Zygons) until he replaced it with a cravat. (TV: Planet of Evil) Eventually, his switched his blazer for a frock coat. (TV: Pyramids of Mars) After switching his cravat for an ascot tie, (TV: The Seeds of Doom) he eventually abandoned neck wear in favour of an open-necked shirt, (TV: Image of the Fendahl) with a likewise unbuttoned waistcoat, as well as a white ascot tied around his neck. (TV: The Invasion of Time)

He wore several frock coats of different colours, including a burgundy coat, (TV: Pyramids of Mars) a light grey beige tweed coat, (TV: The Android Invasion) and a dark brown coat. (TV: The Power of Kroll) He sometimes adorned his coats with lapel pins and brooches in various shapes, such as a flock of geese, (TV: The Power of Kroll) or an artist's pallet with tubes of paint. (TV: City of Death) He also varied his footwear to include leather boots, (TV: The Deadly Assassin) ugg-style boots, (TV: The Face of Evil) and green knee-high wellington boots, (TV: The Power of Kroll) and also changed his usual style to a purple waistcoat, (TV: The Ribos Operation) brown checkered trousers, (TV: The Power of Kroll) and a yellow, checkered waistcoat. (TV: City of Death) He would also switch his braces for a black belt. (TV: Destiny of the Daleks)

As he felt his regeneration nearing, (PROSE: Into the Silent Land) the Doctor overhauled his outfit to a full-length maroon coat, waistcoat, trousers, buccaneer-style leather boots, a Poet's Hat, an ecru open-neck dress shirt with subtle ecru question marks adorning the collars, and a burgundy scarf (TV: The Leisure Hive) with dwarf star alloy sown into its fabric, (PROSE: The Beast Inside) He kept his trousers up with a pair of braces with a flowery design. (TV: Meglos)

The Doctor occasionally wore trench coats, such as a light brown one with dark brown trim, (TV: The Ark in Space) and a plum velvet one. (TV: The Leisure Hive) He also had a black jeweller's scope, (TV: Robot) and had a pair of small-lensed, dark-tinted glasses that he could wear when tinkering with scientific equipment. (TV: The Sun Makers)

Other information
In the Doctor Who series that the Doctor had some part in creating, (PROSE: Afterword, Stop, Thief!) the Fourth Doctor was portrayed by Tom Baker, who was Paul Magrs's favourite Doctor. (PROSE: The Story of Fester Cat) In a short piece Paul wrote about his inspirations for his books, Paul noted that Tom Baker actually looked like the real Fourth Doctor. (PROSE: Bafflement and Devotion)

Age
While on Earth, the Doctor stated his age to be 749 years. (TV: The Seeds of Doom) After ageing four years from crossing a split in time, the Doctor said he would "still think of myself as 743", before admitting he "could never remember" his age. (COMIC: Doctor Who and the Time Witch) He was approximately 813 when he regenerated into his fifth incarnation. (PROSE: Cold Fusion)

Casting
Actors considered for the role of the fourth incarnation included Michael Bentine, Bernard Cribbins, Graham Crowden, Fulton Mackay and Jim Dale. Tom Baker was cast based on his role as the villain Koura in.

Appearance
According to the creators of the show and Baker, the character's look was originally based on paintings and posters by Henri de Toulouse-Lautrec of his friend, Aristide Bruant, a singer and nightclub owner whose trademark was a black cloak and long red scarf.

Possible romances
Since the fourth incarnation was the youngest in appearance at the time, he therefore appeared closer in age to his companions. This led to concerns being expressed of possible "hanky panky in the TARDIS", a term often used in the tabloid press to suggest the impression of off-screen dalliances between the various Doctors and their young, female companions.

Perhaps to address this, according to the Information Text commentary on the 2007 DVD release of The Stones of Blood, Baker generally tried to emphasise the asexuality of the character, apart from possible subtle romantic tension such as that with Sarah Jane Smith. Despite this, Baker was not above tossing in occasional visual jokes that suggested sexual tension.

For example, in The Stones of Blood the Doctor and Romana have to huddle close in order to be within the confines of a transporter beam and enter what would, in normal circumstances, be seen as a romantic clinch, but neither character appears to recognise this. Likewise, the Doctor and Romana are forced into close proximity in The Ribos Operation when hiding from Graff Vynda-K and neither seem to recognise this as a romantic moment.

Secondary media, on the other hand, has often restrained less from romantic moments; particularly with Romana II. For instance, in the Short Trips story Special Occasions: 2. Do You Love Anyone Enough?, the Doctor gave Romana the last Rolo in the Universe for St Valentine's Day. In PROSE: The Well-Mannered War, the Doctor kissed Romana on the cheek.

In popular culture
The fourth incarnation's distinctive appearance and mannerisms have made him a target for affectionate parody. The character appeared several times on The Simpsons and twice on. Even in 2011, a full 30 years after he left his tenure as the Doctor, an animated parody of his incarnation appeared an episode of. In Hugo 2: Whodunnit?, a computer game, the player's character can save Tom Baker's Doctor from a Dalek, who in return gives the player his sonic screwdriver.

He was frequently impersonated by impressionist Jon Culshaw on the radio and television series. Even had an episode featuring an eccentric man claiming to be a time-traveller and wearing a long striped scarf. Archival footage of the fourth incarnation's first title sequence was also used in the episode "Blue Harvest" to represent and parody Star Wars' hyperspace.

Tom Baker, as the narrator of the series, has referenced Doctor Who. He also appeared in Doctor Who and the Daleks in Seven Keys to Doomsday, a stage play that opened two weeks before Baker began his tenure as the Doctor. In the play, Trevor Martin plays an alternative version of the fourth incarnation.

In the book, there was a scene in which a bunny sits on top of the TARDIS with a noose around its neck as the fourth incarnation runs into it, being chased by a Dalek.

Peter Jackson wore a costume similar to the fourth incarnation's when he played Derek in his film Bad Taste.

On, in the episode, "The Justice League Recombination", Stuart wears the Fourth Doctor's costume to a New Year's Eve costume party at his comic book shop.

The video game Team Fortress 2 features the Fourth Doctor's scarf and hat as cosmetics for the Medic class. The items were renamed as the Chronoscarf and Das Ubersternmann. The hat was the first item added in the game in a 2013 patch while the scarf was not added until a year later in the 18 June 2014 update.

Reprising the role
Unlike his predecessors Patrick Troughton and Jon Pertwee or his successors Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann, Tom Baker was notoriously hesitant to reprise the role of the Doctor. Originally intended as a major player in the 20th-anniversary special, The Five Doctors, Baker pulled out before production began, citing other obligations as his reasoning. The production team rewrote the scripts to give much of his role to the Fifth Doctor, and included the Fourth Doctor by making use of unbroadcast footage from Shada. A Madame Tussauds wax mannequin of his incarnation was used in publicity shots to keep the "five Doctors" concept afloat.

In 1993, Baker was hired to play the Doctor full-on for the planned 30th Anniversary Special The Dark Dimension, but the special was cancelled and instead shot a small cameo for Dimensions in Time. Around this time, he also introduced a VHS reconstruction of Shada, though not apparently in character as the Doctor. In 1997 he returned to the role in a more serious manner in the video game Destiny of the Doctors and in a Superannuation advertisement. He also appeared as Tom Baker as the Fourth Doctor in the comedy docudrama Who on Earth is Tom Baker.

Despite his hesitancy to play the role again, Baker made frequent appearances on DVD releases of his stories, recording audio commentaries for many and conducting on-camera interviews for others.

In the 2000s, Baker made a tentative step towards reprising the role by agreeing to record audio books for BBC Audio, reading the texts from several Target novelisations from his era. Finally, in 2009, Baker agreed to return to the role of the Doctor in a dramatic context, performing the five-part Hornets' Nest story arc, again for BBC Audio, in which he was paired up with Richard Franklin, reprising the Pertwee-era companion Mike Yates.

In March 2010, Baker announced on his official website that he was in discussions with Big Finish Productions to record Doctor Who audio dramas for the company. Big Finish confirmed this on 3 June 2010. A few days later it was also confirmed that Baker would be doing additional stories for BBC Audio, AUDIO: Demon Quest, released at end of 2010.

Prior to the cancellation of The Sarah Jane Adventures following the death of Elisabeth Sladen, Tom Baker was briefly considered to play a role in the series, specifically in a planned 2011 Christmas special entitled Miracle on Bannerman Road, in which he would portray a mysterious traveller. (DWMSE 32)

In 2013, Tom Baker made a cameo appearance in the 50th anniversary story, The Day of the Doctor, as the curator of the National Gallery.

Other matters
From a real world perspective, the Fourth Doctor was the first incarnation to ever face a form of time war in any Doctor Who media, in the DWM comic stories The Deal and The Neutron Knights. However, this only became clear in retrospect following the Fifth Doctor's clash with the Millennium Wars in The Tides of Time.

Narratively, the Fourth Doctor is also one of the few incarnations besides the Eighth who has encountered the mythology of the War in Heaven. However, these encounters are not original stories focused on him, but instead recontextualisations of certain serials within various stories of the Faction Paradox series. Pyramids of Mars, The Brain of Morbius, The Talons of Weng-Chiang, and Image of the Fendahl all became direct aftermaths of War-or War-preparation- events. The DWM comic Doctor Who and the Iron Legion is also strongly implied to be connected to Warlords of Utopia.

The Fourth Doctor became the first incarnation not to have any of the master tapes for his episodes wiped by the BBC, as his were the latest in the show's history, leaving the older tapes more prone to reuse.