Sixth Doctor

The Sixth Doctor was the sixth incarnation of the Time Lord known as the Doctor. Arrogant, dramatic, self-absorbed, driven and stubborn, the sixth incarnation instantly believed himself superior to almost anyone he encountered. Nevertheless, he did possess great reserves of compassion, which occasionally shone through.

With his travels with Peri, the Doctor was always dominant in the decision-making and what he did. This often led to his actions being questioned as they mostly seemed like they were for the wrong reason. (TV: The Twin Dilemma - Mindwarp) When Mel joined him later, the Doctor was forced to partake in a diet and exercise regimen, taking on the reversed role.

By this time, he had mellowed from his original unstable self, even to the point of not interfering unless asked to do so. (TV: Terror of the Vervoids)

He was put on trial again by the Time Lords, but this time to act as a cover for nearly uncovering their involvement with the creation of Ravalox to prevent secrets stolen from the Matrix from being used.

This Doctor met his end following a laser attack on his TARDIS from the Rani; he suffered physical trauma during the attack bad enough for him to regenerate into his next incarnation.

An unstable Start
The Doctor's fifth incarnation regenerated after being exposed to spectrox toxaemia on Androzani Minor and giving Peri Brown the only cure he had. This saved her, but doomed him - unless he regenerated into a new incarnation. He expressed uncertainty as to whether he would regenerate or not, but he did in fact regenerate in his TARDIS (TV: The Caves of Androzani).

Peri immediately challenged him to prove he was still the Doctor. He proved he was despite a new face and personality; he expressed joy at the chance, seeing his previous life as unbecoming. Despite having stabilised physically, he suffered initial personality and mental issues that caused him to lapse into extreme paranoia. He lost control and tried to strangle Peri. After regaining control, the horror of his actions caused him to exile himself on Titan III as punishment until he had attained appropriate humility. On Titan III, he met another Time Lord, his old friend Azmael. Instead of a self-imposed exile, he soon became involved with stopping Mestor from launching his gastropods to other worlds. (TV: The Twin Dilemma)

During these early days, the Doctor's personality ranged from extreme lows to bouts of manic near-insanity, which was accompanied by violence. (TV: The Twin Dilemma - Revelation of the Daleks)

New Adventures With Peri
The Doctor set out to fix everything wrong with his aging TARDIS, even succeeding in fixing its broken chameleon circuit; it began changing shape again. At the same time, he become involved with stopping the Cybermen from destroying Earth with Halley's Comet to save Mondas, which the Doctor destroyed in his original incarnation; though he believed that the Time Lords would intervene because of the severe damage this could do to the Web of Time, the Doctor found himself working solo as their agent, again, much to his anger. By the end of the adventure, the chameleon circuit broke again; fed up with his failed attempts to fix it, the Doctor decided to let the TARDIS stay the way it was. (TV: Attack of the Cybermen) Upon seeing that the TARDIS was running low on Zeiton-7 crystals, the Doctor traced a source of them to the planet Varos; if the TARDIS ran out, he and Peri would be stranded. While searching for the crystals, the Doctor was nearly forced to participate in deadly "games" when he attempted to free those trapped in the Punishment Dome. While stopping Sil, the mastermind behind the games, the Doctor obtained more Zeiton-7, restoring the TARDIS's supply of it. (TV: Vengeance on Varos)

Tracing a time distortion to 19th Century England, the Doctor discovered that the Master had survived their last encounter in his previous life, and had teamed up with a female renegade Time Lord called the Rani; both were working together for one of her monstrous experiments to extract the chemical responsible for inducing sleep from human miners, and for the Master's plan to accelerate Earth technology beyond its normal level. Sabotaging the Rani's TARDIS, the Doctor sent both her and the Master flying through the time vortex while he toke back the chemical and cured the miners. (TV: The Mark of the Rani)

After a fishing trip, the Doctor found himself feeling faint. On Peri's suggestion to see a doctor, the Doctor went to Space Station Chimera to be examined. Much to his surprise, he re-encountered Jamie McCrimmon, the only survivor of a Sontaran attack. Taking him aboard the TARDIS, the Doctor used telepathy to connect with his second incarnation to learn where he was being held captive. He found the Androgum, Chessene working with Sontarans to build a time machine; each planned to double-cross the other.

When Chessene temporarily turned his second self into a partial Androgum, the Doctor was forced to kill Chessene's fellow Androgum, Shockeye in self-defence before he butchered his companions. After his second self reverted, the Doctors worked together to stop the Sontarans while Chessene was killed when the time machine exploded. He was greatly disgusted with himself while experiencing temporary bouts of Androgum behavior, so much so that he declared himself a vegetarian. (TV: The Two Doctors)

The TARDIS accidentally went through a time corridor to planet Karfel, a place he and Jo Grant had visited. He discovered that the sinister Megelen now ruled the planet and was using a device known as the Timelash to send his disobedient subjects through time; the Doctor found the amulet that powered it. He also prevented Megelen from mutating Peri into a hideous mutant like himself in order to mate, sending the madman through his own device, to Loch Ness; the Doctor believed that Megelen would become the fabled creature rumored to live in the depths of the loch. During these events, the Doctor met H.G. Wells, who he unintentionally gave the idea for his book "The Time Machine" to. (TV: Timelash)

The Doctor dropped Peri off at a botany symposium, while he responded to a call from a friend, Willis, but was forced into a situation where he encountered Davros and was forced by Arnold Baynes, one of the richest men in the galaxy, to work with Davros. (AUDIO: Davros)

After confronting Davros, the Doctor collected Peri from her symposium and took her on a cruise in 1900 on the steamboat Lancaster. On board, a murder resulted in the Doctor becoming the prime suspect, but this turned out to be a ruse by Captain Callany to convince the Doctor to help him find the real criminal. An agent of the Forge, acting as chief and second in command, had smuggled a mermaid, Amy, and her daughter on board and were planning on selling them when they reached New Orleans. The Doctor met with Amy’s father and convinced him to help them. He incarcerated the Forge agent at the bottom of the sea. (AUDIO: Cryptobiosis)

The Doctor went to Necros to pay his respects to an old friend, Arthur Stengos. However, it was actually a trap set by the "Great Healer", who was in fact Davros. His old foe had falsified the news of Arthur's death to lure the Doctor to the planet in order to enact vengeance upon him. During his time trading barbs with Davros, the Doctor discovered Davros had created Daleks loyal to him. With the arrival of the original Daleks, who sought to take Davros to Skaro for trial and punishment, the Doctor was glad they were too dense to realise his identity when Davros tried to distract them and escape. (TV: Revelation of the Daleks)

After leaving Necros, the Doctor took Peri to 1980s Blackpool, where they battled the Celestrial Toymaker. (AUDIO: The Nightmare Fair)

On Peri's birthday, the Doctor took her to Las Vegas in 1971 to meet Elvis Presley, where he, with Elvis, was kidnapped by alien traders called the Mongarians. He stopped them from making several clones of Elvis to sell throughout the 20th century, ensuring that Elvis was returned just in time for his performance at the Hilton. (PROSE: Priceless Junk)

Travelling to the Gogglebox in search of a book he left behind on a previous trip, the Doctor and Peri learned of the death of Anthony Chambers, a face from Peri's past. They rushed back to Earth in 1984, where they met Peri’s mother Janine and her best friend Katherine Chambers. They also learned that the Cybermen were converting dead people. Anthony, now a Cyberman, rose from the grave and attacked them. The Doctor was captured by the Cyber-Leader who informed him that he had travelled back in time to lay a trap for the Doctor to force him to time travel them back to Earth’s early history and create a new timeline of Cybermen. The Doctor tricked the Cyber-Leader by taking him to 1984 on Mondas. He left and found that Nate, Katherine’s brother, had been brutally attacked and paralyzed by Anthony. Peri, feeling the weight of all the deaths, decided to leave the Doctor after a teary goodbye. The Doctor returns to the Gogglebox and learned of an explosion in Peri’s house that will claim the lives of her mother and another. He rushed back to Earth, but arrived too late to save her mother. Peri returned to the TARDIS now that she has no family left on Earth. (AUDIO: The Reaping)

The Doctor and Peri arrived at a medieval kingdom with a cybernetic created creature called the Hern terrorising the villagers. Investigation, they discovered that the entire kingdom was an artificially created environment stored on a gigantic space ship. (AUDIO: Leviathan)

Upon being warned in a dream about time experiments, the Doctor and Peri arrived on a colossal spaceship and became separated after Peri fell through a ventilation shaft. The Doctor discovered that the ship’s computer was planning to cause the Big Bang and avert man’s creation into such a violent race. Before he could intervene, a Time Lord drew him, Peri and his TARDIS away and informed him that this event was always destined to occur. Angry at almost averting the existence of the universe, he and Peri took off. When asked where they were going, the Doctor commented that he was going to find the biggest library he could and study up on his history. (AUDIO: Slipback)

Shortly afterwards, the Doctor and Peri visited a galactic fair and took part in a virtual immersion experience that played out as a fantasy. Peri became trapped, while the Doctor tried to convince her virtual self of the danger. An alien parasite using the name Mr. Darcy asked Peri to marry him, knowing that if she accepted, he’d be able to take over her mind. The Doctor intervened, but fell prey to Darcy who had planned on taking him over from the very start. Peri woke up in the immersion room and supplied the system administrator – Cranton – with her own story to feed into the fantasy before returning to help the Doctor and defeat Darcy. (AUDIO: A Most Excellent Match)

Peri soon became homesick for 1980s America, (PROSE: CHAOS) so she parted company with the Doctor for a short time to travel to New York City. (COMIC: Kane's Story) He stumbled upon a Whifferdill, a shape-shifter, who called himself "Avan Tarklu". Avan had planned to collect a bounty from Josiah W. Dogbolter. He turned "the Doctor" in, only it was secretly only him in the Doctor's form. He and the Doctor escaped, with Tarklu deciding to stay with the Doctor. He eventually changed his name to Frobisher, in deference to the Doctor's love of all things English, and his shape to that of a large, rather cartoonish penguin. (COMIC: The Shape Shifter)

The Doctor and Frobisher joined with Peri. They travelled together for some time before Frobisher took his leave. (COMIC: Kane's Story, The World Shapers)

After their series of stressful adventures, the Doctor decided to take Peri to the planet Ravolox to relax due to its similarity to Earth. However, he soon learned that Ravolox was indeed Earth, moved thousands of light years from its original position; this perplexed the Doctor because he wondered who could do such a terrible thing. He met the primitive and dimwitted descendants of humanity, whom he barely avoided being killed by multiple times, and prevented a black light explosion by the egotistical machine Drathro. The Doctor also met con man Sabalom Glitz. who explained Ravalox had been moved to protect secrets of a higher species by the Andromeda "Sleepers". Who these beings that had their secrets stolen were remained a mystery. (TV: The Mysterious Planet)

On the planet Thoros Beta, the Doctor found the Mentors were back at work, trying to make deals with a savage king named Ycarnos through a failed attempt to manipulate his mind. After a failed attempt to probe his mind to see if the Time Lords had sent him to intervene on their behalf, the Doctor pretended to be on the Mentors' side and helped Mentor Kiv transplant his mind to a deceased Mentor. Though the process was successful, Kiv began rambling about fish, due to the previous body's mind; as Peri was the only suitable candidate for the new process of having her mind overwritten with Kiv's, this placed her in danger. Though the Doctor rushed to save her from this fate, the Time Lords put him under their control and forced him to board the TARDS. It re-materialised in the Space Station Zenobia. (TV: Mindwarp)

The Trial of a Time Lord
The Doctor tried to use his status as Lord President of Gallifrey to avoid a trial. However, they had brought him here long after the Fifth Doctor had been appointed and removed from office due to absence. In the trial, the Valeyard acted as prosecutor, with an Inquisitor as judge. Having been taken out of time, the Doctor suffered from partial amnesia. He was again on trial for interfering in the affairs of the universe. He represented himself in the trial, during which he and his prosecutor, the Valeyard, would present as evidence events from his life via the Matrix. (TV: The Mysterious Planet, Mindwarp) The Doctor suffered an emotional blow as he witnessed the apparent destruction of Peri's mind and her physical death on Thoros Beta. (TV: Mindwarp)

The Doctor presented the case for his defence, offering an adventure from his future, by which time he had met an Earth woman Melanie Bush. The Doctor was called to a spaceship to be used as a scapegoat to drive out hijackers. However, it turned sour when the Vervoids had emerged from their pods in storage and killed the passengers. The Doctor destroyed them by fast-forwarding their lifecycle. After the footage was shown, the Doctor pointed out that he had gotten better in a short time as he was clearly asked to intervene and deserved to be let go. However, the Valeyard seized on this to charge the Doctor for the genocide of the Vervoids, prohibited by Article 17 of the Constitution. The Doctor pointed out the hole in the Valeyard's claim of genocide; the Vervoids were artificial in nature; they were never truly alive to begin with. (TV: Terror of the Vervoids) During this time, the Doctor met his eighth incarnation, who was traveling through their past to regain his lost memories. Receiving encouragement, the Doctor was advised to have Borusa testify on his behalf. Both drank many goblets of Rassilon's Red wine. (PROSE: The Eight Doctors)

By this time, the Doctor had won over Darkel to his side. To his surprise, the Doctor watched the arrival of both the Mel from his personal future and Sabalom Glitz; they were brought to act as witnesses. Furthering his shock, the Doctor learned that had done this while in the Matrix. Much to his continued confusion, the Doctor learned that the Valeyard was in fact a manifestation of his inner darkness created between his 12th and 13th lives.

Since the defendant and the prosecutor could not be the same person, the trial was made moot. However, the Valeyard took advantage of the confusion and fled into the Matrix. The Doctor followed and entered a battle of wits with the Valeyard. However, the Master intervened with this and tried using him as bait for his own plots. The Doctor overcame this and proceeded to find out that the Valeyard had prepared a weapon to kill all the Time Lords in the court room.

The Doctor escaped and learned that the Valeyard falsified some of the evidence with the aid of the High Council in a plot to steal his seven remaining lives. To his surprise, he learned Peri had not died, but was now wed to Ycarnos as his queen. As the populace of Gallifrey reacted to news of the dishonesty of their High Council, they seemed ready to overthrow their leaders. Subsequently, Darkel suggested the Doctor as the new Lord President for the third time, but the Doctor suggested that Darkel herself would make a better choice. The Doctor left in his TARDIS with Mel. (TV: The Ultimate Foe)

The Doctor returned Mel to Oxyveguramosa, her original point in time, following the conclusion of the trial, after which he travelled alone. (PROSE: Time of Your Life, Business Unusual, AUDIO: The Wrong Doctors)

Weary wanderings
Immediately after depositing Mel, the Doctor travelled to Torrok to become a recluse to ensure that he would never become the Valeyard, and therefore was paranoid about meeting Mel for the same reason, since he was trying to change his future. The Time Lords erased his memory of much of his trial, since it gave him knowledge of his own future. However, the Time Lords still manipulated the Doctor to come out of seclusion and save Earth in 2191 from Krllxk. During this adventure, the Doctor met Grant Markham, who subsequently travelled with the Doctor. (PROSE: Time of Your Life)

On their first adventure in the TARDIS, the Doctor and Grant arrived on Agora, 2191, when it was being invaded by Cybermen. While Grant helped the human colony on Agora defeat the Cybermen, the Doctor was imprisoned and tortured on a Selachian warcraft. After they left Agora, the Doctor spent weeks in the TARDIS recovering from radiation poisoning sustained on board the Selacian warcraft. The Doctor later said that he didn't have much faith in Grant, which he revealed was an attempt to change his future, by choosing a companion he wouldn't normally travel with and didn't even like. However, after their adventure on Agora, the Doctor admitted that he was actually warming to Grant, and hoped that they could become friends. (PROSE: Killing Ground)

No Doctor Who universe accounts exist depicting Grant's subsequent adventures and eventual departure.

After Grant left the TARDIS, the Doctor decided to "retire" from exploring in space and time, after his recent encounter with the Valeyard and the Trial. The Doctor travelled to ancient Greece where he met Plato and had an adventure with the Spindle of Necessity and an alien race called the Fates. After this adventure, the Doctor decided to continue on his journeys. (PROSE: The Spindle of Necessity)

The Doctor had appeared to have become a more sombre individual, so he travelled to Bianca’s Bar, a place where the answers did actually reside at the bottom of a glass. He also discovered the bar was built on the remains of an old TARDIS, a very drunk Iris Wildthyme being thrown out and a dimensional Nexus Point holding everything together through universal wormholes. He also fell in love with the bar’s star singer Bianca, who he later learned was an evil future distillation of one of Iris’ regenerations who had a similar plan as the Valeyard did in stealing the remainder of Iris’ lives. After confirming his love for Bianca, almost shooting Iris and causing a time ram, together with Iris, the two managed to defeat Bianca and her army of shadows and Wyrms. (AUDIO: The Wormery)

The Doctor later visited Hogarth City on Charisma, a lawless planet inhabited by thieves and murderers, where he battled the Logovore, a shapeshifter. However, he was forced to leave Charisma before he could deal with the Logovore, unaware that it had copied his identity. (PROSE: Death Sentences)

The TARDIS landed in a museum in the city of Excelis on the planet Artaris. The Doctor discovered a thief in the museum, trapped by the security system and hid in his TARDIS while the wardens came. He was arrested shortly afterwards on a suspicion of thieving, but succeeded in convincing the officers of his innocence. Afterwards, he met Reeve Maupassant, a man who looked like Grayvorn whom he met 1000 years ago on Artaris. The Doctor discovered that when they fell from the convent bell tower, the Relic merged Grayvorn and the Mother Superior's minds into one, making Grayvorn immortal at the cost of being unable to sleep. Therefore, Maupassant was behind the raid, intending to trigger a failed theft of the Relic and then claim it for himself under the guise of 'protecting evidence'. So he could use the Relic to transfer one of them into another body, so he could have a body to himself after 1000 years. However, just as Maupassant tried to open the Relic to transfer the second soul into a new host, he was distracted by Danby, an Inquisitor who had been helping the Doctor's enquiries, giving the Doctor the chance to open the Relic on Maupassant and apparently absorb both Maupassant and the Mother Superior into it. After which, the Doctor departed in triumph, although he didn't know that Grayvorn's spirit was actually absorbed by the museum, where he would remain...for now. (AUDIO: Excelis Rising)

At some point while travelling alone, the Doctor visited the Galjari race and adopted the title of “The Sandman”. He proceeded to scare the pillaging Galjari out of a war against the native colony and imprint himself into their fears. He would visit the race every now and again whenever they got out of hand. (AUDIO: The Sandman)

The Doctor went on the trail of a parasite known as "the Darkness", and arrived on Earth, where he was saved from a mugging by UNIT officers, Will Hoffman and Emily Chaudhry. Aided by Will, Emily and once again, UNIT, the Doctor stopped the Darkness from influencing the human population into murdering their loved ones. (PROSE: The Terror of the Darkness)

Taking Emily and Will home in the TARDIS, the Doctor got sidetracked by a distress signal, leading him to an army base in World War II - and a reunion with Edward Grainger, and the two old friends worked to return the Mim back to its homeworld. After this, the Doctor witnessed the birth of Edward's son, John. Preparing to take Emily and Will home, the Doctor received a mission to travel to 1957 to investigate discrepancies in the UNIT archive. (PROSE: Incongruous Details)

Arriving in 1957, the Doctor discovered his whole history of defending the Earth had been wiped off the record at the Ministry of Defence by a British goverment agent called Ronnie Tillyard. After this, the Doctor finally returned Emily and Will home. (PROSE: Untitled)

The Doctor attended the funeral of Alistair Gordon Lethbridge-Stewart, as did all of his other incarnations. (PROSE: The Gift)

Re-Meeting Frobisher
Following his trial, he reunited with Frobisher in 82nd century, when Frobisher became a DI again, and was investigating crimes. After he solved the mystery, involving Josiah W. Dogbolter, Frobisher decided to travel with the Doctor again, for a time. (AUDIO: The Maltese Penguin)

After travelling with the Doctor again, Frobisher used the TARDIS to create an artificial fish to hunt. This caused the TARDIS to go an strike, and take them to pocket universe, where a kingdom full of people existed, as a prison and torture device for a man called Eugene Tacitus (who killed his son). After realising the true nature of the world he lived in, he killed himself, destroying the universe around him. Frobisher later realised that the TARDIS deliberately brought him here, so he would understand that cruelty to artificial beings was still valid cruelty. (AUDIO: The Holy Terror)

During later adventures, Frobisher met Sabalom Glitz, (PROSE: Mission: Impractical) and encountered the descendants of a Peri that married Yrcanos. (COMIC: The Age of Chaos)

After Frobisher left him, the Doctor was arrested and faced execution on the planet Braspal by the Inquisitor because he had saved a younge boy's life on his last visit, and the younge boy grew up to become a vicious dictator who caused billions of deaths on Braspal, which the Inquisitor grudgingly held the Doctor responsible for. However, the Doctor showed him that the slaughter the population had suffered strengthened the people of Braspal, who went on to defeat a Dalek attack force, saving the whole universe. After this, the Inquisitor released the Doctor, and the Doctor saved the Inquisitor from execution in return. (PROSE: The Inquisitor's Story)

A reminder of the past
After travelling alone again, the Doctor received a distress signal and he crash landed on a planet where his TARDIS was heralded as a godly artefact. He encountered Peri, who had tended to him while he was unconscious. Apparently the Timelords lied about her being happy and that she was now stranded on the planet. The two discovered the Doctor’s TARDIS was emitting a dangerous temporal energy that was ageing the people of the planet into dust. While investigating, Peri contracted a deadly disease and died. Furious, the Doctor set about to uncover the plot he was being tangled in. he discovered that everything that had happened after he received the distress signal had been a hallucination and that he was hooked up to a dream machine. The death of Peri and his TARDIS had been a ploy to lure the Doctor into committing suicide. (AUDIO: Her Final Flight)

Upon meeting a simlation of Peri, it prompted him to travel to Los Angeles, 2009 to meet a version of Peri who was transported to Earth, with all her memories of travelling in the TARDIS wiped. During an adventure involving the Piscon, the Doctor and Peri discovered that due to the manipulations of the Time Lords, five alternate Peri's exist in the universe, simulataneously. After this encounter, the Doctor offered Peri the chance to return to the TARDIS, but she refused. (AUDIO: Peri and the Piscon Paradox)

Adventures with Evelyn
The Doctor then spent some travelling alone. He, at some point after his trial, was tracking a nexus point distortion and encountered Evelyn Smythe. The Doctor then took her back in time to stabilise the nexus point and save her life. Upon doing so, the Doctor offered Evelyn the chance to travel in the TARDIS with him. (AUDIO: The Marian Conspiracy)

While Evelyn was trapped in the TARDIS, (PROSE: Instruments of Darkness) the Doctor visited the Kurgon Wonder. The Doctor was led into a series of events involving an alternate timeline, the Knights of Velyshaa and an invasion of Gallifrey. Following an encounter (and seeming absorption) by the Temperon, he found himself on Gallifrey with his fifth and seventh selves. Together they worked to attempt to escape Gallifrey and set history along its correct path. However it was the Doctor (his sixth self) that freed the Temperon, allowing it to set history amongst its correct path. (AUDIO: The Sirens of Time)

Whilst travelling with Evelyn the Doctor once again met his old friend Alistair Gordon Lethbridge-Stewart and while on the planet Etra Prime the Daleks once more. He also assisted Romana's escape from them and her return to Gallifrey. (AUDIO: The Apocalypse Element)

Stopping for Fried Duck in South of England, the Doctor and Evelyn meet Amelia and Reggie, a couple experimenting with vampire DNA. Evelyn befriends a young mother named Cassie while the Doctor helps Amelia prefect a cure to stop their mutation. A sinister vampire named Nimrod, head of a secret Black Ops organisation called The Forge, hunted Amelia down in an effort to correct his mistake for creating the vampire kind. Amelia tricked the Doctor and turned the cure into a virus, first infecting Cassie, before going to infect the rest of the world. Nimrod joined up with the Doctor to stop Amelia. Amelia drowned and the Doctor learned that Nimrod blew up Amelia’s blood bank along with himself. He took Cassie to Norway to hide while he developed a cure for her condition. Unbeknownst to him, Nimrod survived. (AUDIO: Project Twilight)

The Doctor returned to Klutch to scare the Galjari into submission as he has done countless times previously. There he learned of mysterious deaths blamed on his actions. Upon investigating, he came under attack by Galjari seeking to end his terror, but managed to convince him that another force was using his reputation against them. After dealing with the looming threat, the Doctor made peace with the Galjari. (AUDIO: The Sandman)

The Doctor and Evelyn investigated an ancient Mayan temple on an expedition group after being informed of a distress call mentioning "Cybermen". The Doctor met a young doctor named Goddard who turned out to be a hybrid Cyberman from the 1930s and also came under attack by partially converted Cybermen. After nearly causing a paradox involving the Earth and the late 32nd century, the Doctor was able to defeat the Cyber-Controller, but unbeknownst to him, Evelyn had contracted the virus that was responsible for infecting Goddard’s people in his timeline. (WC: Real Time) After finding a cure for the Twilight virus, the Doctor and Evelyn returned to find Cassie. They learn that Cassie was now an agent of the Forge and of Nimrod. The Doctor was captured by Nimrod while Evelyn tried to undo Nimrod’s control over Cassie. Nimrod attempted to force the Doctor into undergoing regeneration so that he could study it. Cassie was freed from Nimrod’s influence and rescued the Doctor, but was killed by Nimrod’s crossbow before she could escape with the Doctor. (AUDIO: Project Lazarus)

Cassie's death and the Doctor's inability to save her strained Evelyn's relationship with him. She needed some time away. During this time, on the planet Világ, Evelyn grew close to a man named Rossiter. But felt that she could not leave the Doctor for him. (AUDIO: Arrangements for War)

The Doctor and Evelyn travelled to Rome, 101 BC, approximately, October. They meet a young lady of 19, Aurelia. She mentioned her husband - Julius Caesar. Evelyn was excited, but her excitement soon turned to confusion. (AUDIO: 100 BC) The Doctor came under the influence of an external force that informed him that they had sent an assassin to inject him with a lethal virus that would kill him in 100 days. Together with Evelyn, he narrowed down the planets and went to investigate, seeing some of his other incarnations that included his previous incarnation, Peri and Erimem attending a party, his next incarnation being held at gunpoint and being rescued by two of his companions and two of his eighth incarnations playing poker in a bar, he tracked down the assassin and tricked him into thinking that he too was dying. The Doctor managed to retrieve the antidote just in time. (AUDIO: The 100 Days of the Doctor)

On a visit to 2010, the Doctor and Evelyn encountered Thomas Brewster, a companion of the Doctor's previous incarnation. Brewster was trying to return to his own time when he was contacted by Symbios, a sentient planet. Symbios was being invaded by an alien robot species called the Terravore. Brewster provided Symbios with hosts who were riding the tube. After defeating the Terravores with the Doctor, Flip Jackson and DI Patricia Menzies, who already knew the Doctor. Although he had never met her before, (from his perspective). Brewster stole the TARDIS key, snuck aboard and held the Doctor and Evelyn at gunpoint, demanding they return him to his own time. Which the Doctor begrudgingly did. (AUDIO: The Crimes of Thomas Brewster)

While they were travelling in the Time Vortex, the Doctor and Evelyn managed to disarm Brewster, and change the course before they arrived at their destination. The Doctor justified his actions, by saying that if Brewster returned to his own time, then using his future knowledge would cause chaos and anarchy. The Doctor, Evelyn and Thomas materialised on the Axos spaceship in the mid-21st century that the Doctor trapped in a time loop on 20th century Earth. Earth was trying to use it to solve the world energy crisis. However, the Doctor and Thomas managed to trap Axos in the time loop again. (AUDIO: The Feast of Axos)

After an adventure in Victorian Lancashire, Brewster was left behind by the Doctor. However, he went on to travel with an alien trader. (AUDIO: Industrial Evolution)

On a return trip to Világ, Evelyn left the Doctor to marry Rossiter. The Doctor reacted badly and refused to say goodbye properly. (AUDIO: Thicker than Water) However, another account suggests that it was the Doctor who decided to leave Evelyn behind, but on Earth, 1988, to "keep an eye out for any old enemies", such as the Irish Twins. On this occasion, both the Doctor and Evelyn parted on bad terms. (PROSE: Instruments of Darkness)

After Evelyn
Still slightly bitter about Evelyn leaving the TARDIS, the Doctor had an adventure in 2001, with the Brigadier, and they attempted to solve a secret about Adolf Hitler, and prevent the Fourth Reich from rising. This involved the Doctor and the Brigadier travelling back to the Second World War in Germany and infiltrating the German government by befriending Hitler. Meanwhile, they were forced to investigate this connection between a Neo-Nazi society, and a conspiracy involving an alien spaceship that had crashed on the southern coast of England during the 1940s. (PROSE: The Shadow in the Glass)

Shortly after Evelyn left the TARDIS, (AUDIO: Thicker than Water) the Doctor began to accept the inevitable, and travel to Pease Pottage, 1987 to pick up Mel. However, an earlier version of his current incarnation with an older Mel (having just left the trial) also arrived, causing confusion while battling Stapelton Petherbridge. It soon became clear that Petherbridge was an alien who had create a fake Pease Pottage and isolated it outside of time, in an attempt to trap the Doctor. During this occasion, the younger Doctor was almost killed, meaning the older Doctor faced losing all his experiences since his trial. However, the two Doctors and the two Mels defeated Petherbridge, but it resulted in the younger Mel's death. Noticing a discrepancy in the timeline, the older Doctor used Petherbridge's technology to alter events, putting her back in the real Pease Pottage in 1987, while the younger Doctor decided to deposit the older Mel on Oxyveguramosa, where she was taken by the Time Lords before the trial. Electing to let history run its natural cause, the older Doctor decided to continue travelling alone, until he met Mel again, properly. (AUDIO: The Wrong Doctors)

Meeting Flip Again
Tracking the Davros and the Daleks to the Battle of Waterloo on 18 June 1815, the Doctor learned that Davros was plotting to change history by helping Napoléon Bonaparte win. He used Davros’ mind exchange machine to switch bodies with him to try and reform the Daleks but Davros escaped and reunited with one of his former associates Flip Jackson and her boyfriend Jared. Convincing Flip that the Doctor that she been accompanying was an imposter, Flip defected to the Doctor’s side while Davros convinced the Daleks of his identity. Together, the Doctor tricked the Daleks into think he was Davros and showed Napoleon their true nature, after which Napoleon surrendered. Flip elected to travel with the Doctor afterwards. (AUDIO: The Curse of Davros)

Sitting down to watch cricket on his Time-Space Visualiser, the Doctor and Flip encountered a disturbance which trapped Flip in another dimension. The Doctor tracked the signal to the planet Trans-mission. There he found Porchians attempting to steal a new television station’s Reality Generator – a device that could project recordings into reality. Flip was caught in the movie dimension, but due to a sabotage, the dimension’s villain – Lord Kran – escaped into reality and started to invade it. The Doctor used the Reality Generator to create a bomb that would destroy any fictional aspects, but leave anything that belongs in reality alone. (AUDIO: The Fourth Wall)

The Doctor and Flip transmatted to Earth in 16127 to see how Earth was getting on. They befriended a family in Scotland before the Transmat system became deactivated. The Doctor detected the Wirrn’s presence and had Flip glide to the nearest city to warn them. She crashed, causing the Doctor to go and look for her. The Wirrn awakened and began attacking, but the Doctor used the Transmat system to freeze them under the surface of Lake Loch. (AUDIO: Wirrn Isle)

Experiencing the Ultimate Adventure
At some point after his travels with Flip, but prior meeting Mel, the Doctor arrived during the French Revolution in 1789, where he met Jason. He was sentenced to death by the guillotine, but was rescued by the Doctor and became his companion. (AUDIO: The Ultimate Adventure)

At some point after he arrived, the Doctor took Jason to Metebelis III in the Acteon Galaxy, which was nowhere near as peaceful as he had been led to believe. (AUDIO: Beyond the Ultimate Adventure)

After receiving a summons from Margaret Thatcher in 1988, the Doctor and Jason defeated a plot by the Daleks and the Cybermen to kill the Doctor and destroy the TARDIS. This led them to arrive in Bar Galactica, meet Madame Delilah and Karl the Dalek mercenary, and to take a return visit to the French Revolution, moments after Jason escaped before. During this adventure, they were helped by Crystal and Zog, whom the Doctor invited to join them on their travels. (AUDIO: The Ultimate Adventure)

The Doctor, with Jason, Crystal and Zog later visited Leisureworld on the living planet, Krennos, where they uncovered a plot by the Chameleons. (PROSE: Face Value)

After Zog left the TARDIS crew, the Doctor, Jason and Crystal were summoned by Karl, to return to Bar Galactica to attend Madame Delilah's funeral, which was her last request. After this, Karl sent the TARDIS crew on a quest for treasure and universal danger, into an obscure dimension, to the icy world of Ultima Thule, where they met The Eidolon. (AUDIO: Beyond the Ultimate Adventure)

Encountering a Future Companion
While travelling on his own again, the Doctor picked up a distress signal from a desert island in the year 500,002. There, he rescued a young girl named Charley Pollard who, unbeknownst to the Doctor, was, in fact, the companion of one of his later incarnations. Together they landed in a hotel room on 29 February, 2008 and found a dead body. While trying to investigate the death, the Doctor and Charley encountered DI Patricia Menzies, who had never met the Doctor (from her perspective). She believed that the Doctor was the murderer, but he revealed that he was a time traveller, and eventually convinced her that it was true. Investigating further, they realised that an alien named Slater had let slip a case full of a strange new toxin that bonded its victims to the building itself. The toxin infected a man named Sam. The Doctor was too late to save Slater from Sam’s wrath and reluctantly took Charley on as his companion. (AUDIO: The Condemned)

After Charley accidently alerted the library of Alexandria about an overdue book, the Doctor and she landed in a tomb near the Doomwood family. There, they learned of a mysterious curse that loomed over the family and before long, one of its members died. Charley became influenced into thinking that she was the bride of a nobleman before turning into Gypsy Charlotte, a highway robber partnered with Dick Turpin, a character in the novel they were planning on returning. The Doctor followed on horseback and realised that Charley had the Doomwood curse. He followed Charley and Dick to York where he learned that the particles that were making up the fiction were spreading and that before long, everyone would become possessed by fiction. Figuring out that the only way to save Charley is to surrender to fiction, the Doctor took on the personality of a fictional character and met up with Charley, who snapped out of her trance and freed him too. (AUDIO: The Doomwood Curse)

The Doctor and Charley travelled to 2008, where they encountered DI Menzies again. They discovered that a pound coin from 2012 appeared in a coin-operated vending machine four years too early. This led them into the middle of a war between the Cyrox and the Tabbalac, with Earth as its battleground. After the war was ended, Menzies asked the Doctor if she could travel with him. The Doctor politely refused, citing the growing mystery surrounding Charley's true identity, but indicated that one day he might take her up on the offer. (AUDIO: The Raincloud Man)

The Doctor became suspicious of Charley’s secretiveness and eventually confronted her. She collapsed in the TARDIS and was placed in the Zero Room to recover. The Doctor discovered that Charley had been infected with a virus and spent several years trying to cure her. He traced the virus to the Amethyst Viral Containment Station, which had been constructed by the Viyrans, and found a conspiracy involving the Daleks. The Daleks were trying to find Patient Zero. Charley woke up in the TARDIS and confronted a strange woman that seemed to have a large amount of knowledge about the Doctor. This person identified herself as Patient Zero and confessed that she had infected Charley with the virus. The virus was created to turn infected people into copies of whoever infected them. Patient Zero had been experimented on by the Daleks and infected with the virus. She snuck abroad the TARDIS while the Doctor was being chased by them and had remained in the TARDIS ever since. While the Doctor took care of the Daleks, Charley discovered that Patient Zero (Mila) had been infected by Charley after she infected Charley. Mila had planned to take over Charley’s life by transforming into a replica of her. Unable to stop her, Charley faded out of existence while Mila took her place. (AUDIO: Patient Zero)

The Doctor received a summons from an old deceased friend and travelled to Draconia once more. There he discovered a conspiracy involving the new crown prince of Draconia, his mother and an army of paper soldiers that were used by the previous kings of Draconia to amuse themselves while they drifted in their tombs in space. (AUDIO: Paper Cuts)

After travelling for several months, the Doctor and Mila landed in an alternate timeline created by the Viyrans' attempt to remove a virus from Earth's population. Here the Doctor discovered that Mila wasn't the real Charley, and Charley had been found and cured by the Viyrans, whom she helped for several millenia in their quest to expunge all the viruses which had escaped from the Amethyst station. After Mila sacrificed herself to save the Doctor and the Earth, Charley revealed her identity to the Doctor. To make him want to forget his travels with her, she told him that when he met her, he would die (still believing that the Eighth Doctor had not regenerated). She used the Viyrans' memory-altering technology to replace Mila with herself in the Doctor's memories of their travels together. (AUDIO: Blue Forgotten Planet)

Rejoining with Jamie McCrimmon
The Doctor was reunited with a version of Jamie McCrimmon. He had no memories of the Doctor or his travels with him, however, after an adventure during the Battle of Culloden, Jamie decided to travel with the Doctor again. (AUDIO: City of Spires) The two shared several adventures together. (AUDIO: Night's Black Agents, AUDIO: The Wreck of the Titan)

However, after a while, the Doctor and Jamie discovered that they were in the Land of Fiction all along, and that Jamie was a fictional character created there, from a cut revealling that his blood was made of black ink, the lifeblood of the land. He was created by Zoe Herriot as a friend and a mystery for the Doctor to solve. At that time, the Land of Fiction was being invaded by the Cybermen, so he and Jamie helped to stop the invasion. While the Doctor returned Zoe to the Wheel, the Time Lords' conditioning of her mind returned and she lost her memories of him for the last time. However, Jamie decided to remain in the Land, and told the Doctor to find the real Jamie if he ever found himself in the Scottish Highlands again. (AUDIO: Legend of the Cybermen)

On one occasion, the Doctor tracked Ulrick to the site of an early Dalek battle between Ulrick’s ancestors and the Daleks. He convinced Ulrick to trust him, turn a roboman under his control and meet him on the roof of the building. There, the Doctor used his TARDIS to transport the Dalek Prime and Ulrick backwards in time. The Doctor joined his Fifth, Seventh and Eighth incarnations briefly before being returned to his own timeline. (AUDIO: The Four Doctors)

Living in Victorian London
The Doctor arrived in Victorian London during the 1890s, due to the temporal experiments performed by Professor Payne, which caused him to crash land. While in this time period, the Doctor used the alias "Professor Claudius Dark," sunk the TARDIS in the underground to avoid detection and attempted to investigate Payne and his experiments. However, the Doctor discovered his old friends, Henry Gordon Jago, George Litefoot and Leela, were already investigating the incidents, and tried to contact them. When Payne and his temporal experiments were stopped by them, the Doctor found he was still trapped on Earth, discovering it was due to the interventions of Mr Kempston and Mr Hardwick, who had also crashed on Earth, due to Payne's experiments, and tried to steal the TARDIS to get more advanced time travel. (AUDIO: The Hourglass Killers)

So he invited Jago and Litefoot to meet him, and help him investigate them, (although they didn't recognise him since he was in his fourth incarnation when they first met), but didn't reveal his identity. (AUDIO: Chronoclasm) They escaped from "Claudius", believing him to be hostile, but he still worked with Leela (who recognised him) and made the suggestion that they all go to Brighton while the Doctor investigates Kempston and Hardwick. (AUDIO: Jago in Love) However, this didn't work out, so the Doctor gave them all tickets to Oscar Wilde's new show, where they had an adventure with him. (AUDIO: Beautiful Things) The Doctor arrived in time to save Jago and Litefoot from a train trapped in a time loop caused by Kempston and Hardwick, where he revealed his true identity. (AUDIO: The Lonely Clock) With the help of Jago, Litefoot and Leela, they discovered that Kempston and Hardwick were part of a crashed Temparon vessel, and defeated them. After retrieving his TARDIS, and seeing off Leela, the Doctor offered Jago and Litefoot the chance to travel with him in the TARDIS, which they accepted. (AUDIO: The Hourglass Killers)

Voyages with Jago and Litefoot
On their first trip through space and time, the Doctor took Jago and Litefoot to Venus in the far future, where they discovered the corrupt Venusian Queen Vulpina was imprisoning an alien race called the Thraskin. However, they defeated Vulpina and released the Thraskin, resulting in a peaceful treaty between the Thraskins and Venusians. The Doctor, Jago and Litefoot then left Venus. (AUDIO: Voyage to Venus)

Although they intended to return to London, the TARDIS arrived in the Roanoke Island, 1590, and were held hostage by a local tribe of Native Americans. They discovered that the tribe were being terrorised by a group of ethereal children, who had been present for four hundred years. Whenever they kidnapped natives, they would leave behind the word Croatoan, inscribed in the place where they once were. The Doctor, Litefoot and Jago discovered that Croatoan was an island, which they intended to explore, but not before Henry was kidnapped.

When they arrived on Croatoan Island, they found Henry, and discovered the TARDIS, which had been on Croatoan for four hundred years. When they found Henry's captor, he revealed that he was Sir Walter Raleigh, who had discovered the TARDIS, while the Doctor and George were venturing to Croatoan. After tampering with the controls, Raleigh travelled back four hundred years, and encountered a group of alien beings, who would later become the children who had terrorised the tribe. He taught them how to live and hunt and, in return, they extended his life. However, the Doctor managed to communicate with Walter in the TARDIS, four hundred years prior, and prevent him from travelling in the TARDIS. This then caused the alternative Walter to disappear, and the aliens would never have terrorised the tribe.

After restoring the timeline, the Doctor deposited Litefoot and Jago back in London. However, after leaving, he didn't realise that he had left them stranded in London, 1968. (AUDIO: Voyage to the New World)

Return to the Drashani Empire
Whilst he was travelling alone, the Doctor arrived on Cawdor, deep in the heart of the Drashani Empire, during the middle of a war. The Doctor had previously arrived in the Drashani Empire, on the planet Sharnax, in his fifth incarnation. (AUDIO: The Burning Prince) The Doctor discovered a plot by a figure called Tenebris (who seemed to recognise the Doctor) to use a secret weapon called the Acheron Pulse. However, the Doctor foiled this plan, and the war continued. (AUDIO: The Acheron Pulse)

History takes its course
After foiling a plot by the Master and the Usurian to take over the stock market, the Doctor finally met Melanie Bush (for the first time in her timeline) on a beach in Brighton in 1989. Mel was a computer programmer. They were forced to defeat the Nestene Consciousness, and the Doctor met the Michael Townsend and the Irish Twins again. (PROSE: The Scales of Injustice) After the problems were resolved, the younger Mel elected to travel with the Doctor until the end of the Doctor's sixth incarnation. (PROSE: Business Unusual)

The Doctor and Mel then travelled to Tantane Spaceport, (AUDIO: Spaceport Fear) and confronted his old enemy The Eminence. (AUDIO: The Seeds of War)

While playing a game of monopoly, the Doctor’s TARDIS answered a distress signal from the far future where everything had already been discovered. On the planet Generious, he and Mel encountered two scam artists who were claiming to be the Doctor and were creating fake dangers to con the people into paying them to help. Another threat, a real one appeared in the skies and offered to let the people live if they handed over the three greatest treasures of Generious. The Doctor and Mel teamed up with their phony counterparts and underwent a quest to find the treasures. (AUDIO: The One Doctor)

While visiting her uncle in 2003, Mel was transported to 1782 where she awoke with amnesia. The Doctor and her uncle travelled there and learned that she had been taken in by a local aristocrat. Mel had mistakeningly been drugged by one of the village doctors, not knowning it was partly because of the medicine that her memory stayed distorted. The Doctor realised that Mel had become one of her own ancestors and struggled with trying to maintain the timeline, but found a way around it in order to save Mel. (AUDIO: Catch-1782)

One account depicts the Doctor and Mel arriving on Vilag, where they met Evelyn after she decided to leave the Doctor and live there with her husband, Rossiter (which was apparently Mel and Evelyn's first meeting with each other). (AUDIO: Thicker than Water) However, another first meeting between them occurred on Earth, 1993, after the Doctor had left her behind, before her native time zone. The Doctor revealed that he initially left Evelyn behind, because he realised that Evelyn wanted to leave. But he didn't want her to go, so he left her in 1988 out of spite. Regretting his actions, the Doctor took Evelyn back to her native time, parting on friendlier term. But not before taking a short side trip to the Eye of Orion, since she didn't have the chance to visit it during her initial travels. (PROSE: Instruments of Darkness)

Death
After encountering his future self in the TARDIS, the Doctor's adventures eventually led him to the Library of Carsus, where he worked with an old Time Lord friend, Professor Rummas and many alternative versions of himself from different universes to stop the Lamprey, a pan-dimensional being, from destroying creation with the power of the Spiral Chamber, a powerful Time Lord artefact that acted as a portal into the nexus of the Time Vortex. However, the Doctor was forced to sacrifice much of his energy to trap the Lamprey inside the Chamber. (PROSE: Spiral Scratch). Dying, the Doctor materlised the TARDIS in deep space to take one last look at the universe. However, the Rani bombarded The Doctor's TARDIS and caught it in a tractor beam. she forced the TARDIS to land on the planet Lakertya. The attack on the TARDIS caused the Doctor to incur a "bang to the head" on top of his chronal drain, and this final injury caused the Doctor's body to give out. He died on the floor of his TARDIS, which initiated his regeneration. The Doctor finally regenerated into his seventh incarnation, just after the Rani invaded his TARDIS. (TV: Time and the Rani)

The Doctor's final words before his regeneration were "Local... tractor beam..." (PROSE: Spiral Scratch)

Undated/Unchronicled events
Apparently, Evelyn Smythe was present during this encounter with Travers, and on that occasion he proposed to Evelyn. (PROSE: Instruments of Darkness)
 * At some point when Peri wasn't present and Frobisher hadn't joined the Sixth Doctor visited Zazz and met the Lorduke. (COMIC: The Gift)
 * The Doctor had met Captain Travers at some point prior to 2986. (TV: Terror of the Vervoids)
 * Presumably at some point after this the Doctor and Mel experienced the encounter with the Vervoids chronicled during the Doctor's trial, and the Doctor's personal chronology finally synched with Mel's after she was returned to her proper time zone after having assisted the Doctor earlier in his life during the trial. (TV: Terror of the Vervoids)
 * River Song met the Sixth Doctor, but did not care for him, comparing him to a clown put through a woodchipper. She wiped his memory with mnemosine recall-wipe vapour so their personal timelines wouldn't be contaminated. (GAME: The Eternity Clock)

Encounters with other incarnations
He encountered his second incarnation and Jamie McCrimmon whilst investigating temporal research on Space Station Chimera. (TV: The Two Doctors) The Doctor also met his fifth and seventh incarnations in an alternative timeline. He saw only meeting two other versions of himself to be a "small mercy". (AUDIO: The Sirens of Time).

He described his seventh incarnation as "a small type with an odd accent" to his companion Evelyn Smythe, telling her that he was "not looking forward to that." (AUDIO: Arrangements for War) He later told Evelyn that from what he had heard of his future self's activities, his future self was "always blowing up planets." (TV: Remembrance of the Daleks; PROSE: The Pit, Blood Heat, Cold Fusion)

He briefly encountered his fifth, seventh and eighth incarnations after helping to change the course of the Jariden-Dalek conflict, but the memory of the meeting was erased by temporal changes. (AUDIO: The Four Doctors)

He once told his companion Flip Jackson that many of his other incarnations were "astonishingly irritating." (AUDIO: The Fourth Wall)

Personality
The sixth incarnation saw his new body as an improvement and felt that his previous incarnation had a feckless charm that wasn't him. This Doctor was unpredictable, consistently arrogant and self-absorbed, stubborn and childish, argumentative and tasteless, and often unlikeable or even loathsome. He could be melodramatic. He rarely doubted his abilities and considered himself greatly superior to nearly everyone whom he encountered. This included his companions, especially Peri, though he seemed to have mellowed by his time with Evelyn. However, he could be quite critical of himself in some situations, claiming that only he would be foolish enough to attack a knight of the Grand Order of Oberon. (TV: Revelation of The Daleks)

He once described this incarnation as pragmatic. (AUDIO: The Sirens of Time) He did not suffer fools gladly. He sometimes seemed to endure his companions' presence far more than he enjoyed it, but the new incarnation's brash exterior hid the fact that this was a Doctor more determined than ever to defeat the evil which he encountered. He was possessed of a tenacity and a thirst to do what was right far more visible than before. Despite his often unstable demeanour, he was quick to act when the situation called for it, and very little, even his companions, could hope to get in his way. More than his other incarnations, the Doctor was a fatalist, more than once deciding he was doomed and resolving to accept his fate.

During this incarnation, he began to see the logic in murder. (PROSE: Alien Bodies) This might be reflected in being slightly more accepting of violence. While his physical attack on Peri could be attributed to a post-regenerative crisis, he reacted with humour at witnessing two men fall to their death in an acid bath. (TV: Vengeance on Varos) He smothered Shockeye to death in self defence. (TV: The Two Doctors) He also killed Chintor at close range with a double-barreled shotgun. (PROSE: Retribution) Peri sometimes seemed nervous around the Doctor (TV: Attack of the Cybermen, Timelash), perhaps due to his initially erratic behaviour as his memory seemed to have "been through a grinder' due to him often mistakenly calling her by the names of his past companions.

When Peri was distressed over the non-existence of London, the Doctor tried to comfort her, even showing empathy for her plight. However, he encouraged her not to become emotional. Peri noted he talked about the planet's ruin as if he were in a planetarium instead of there in person. (TV: The Mysterious Planet)

This Doctor also viewed the cause of his regeneration, which he described as "a bang on the head" as being unfitting. (AUDIO: Zagreus)

However, this incarnation also had a more emotional and caring side. He was determined to save the survivors of the Ravolox conspiracy from Drathro, stating "I can't let people die if there's a chance of saving them." He was devastated when presented with the false news of Peri's demise on Thoros Beta, and was enraged that the Time Lords had decided to act like second rate gods and engineer her execution, threatening he had every intention of discovering what they were up to. When he discovered the Time Lords were behind the Ravolox conspiracy and had murdered billions of humans to preserve their secrets, he announced his purpose was to stop evil and power mad conspirators, but that he should have stayed on Gallifrey and not travelled the universe to do so. (TV: The Mysterious Planet, Mindwarp, The Ultimate Foe)

After the events of the Trial and subsequently becoming a recluse, the Doctor became more aggressive and irascible. (PROSE: Time of Your Life) However, this was used to cover up a deep feeling of depression which resided within. This depression was so deep and consuming, that he even got to the stage where he contemplated suicide. Furthermore, the Doctor showed a lack of faith and even a dislike for his companion, Grant Markham, as a means of changing his future, demonstating his lack of consideration for his companion, and even self absorption for his own problems. However, his opinion of Grant changed, after Grant proved that he wasn't as dislikeable as he initially believed, shown more of a warmth towards Grant. (PROSE: Killing Ground)

This warmth between the Doctor and Grant apparently softened this feeling of deep depression. After Grant left, the Doctor did become a sombre individual, rather than being genuinely depressed. (AUDIO: The Wormery, Excelis Rising)

After he began to travel with Frobisher again, (AUDIO: The Maltese Penguin) the Doctor became friendly and playful, as well as sharing jokes with each other during serious situations. Although the Doctor maintained most of his fundamental negative qualities, they were less noticeable and controlled. This new persona would be maintained for the rest of his incarnation. (AUDIO: The Holy Terror)

Habits and quirks
After an unpleasant encounter with an Androgum in Spain, the Doctor said he was becoming a vegetarian, though there is little in the chronicles to suggest he actually followed through with this. (TV: The Two Doctors)

Commonly, he would overreact with rage when questioned about his methods or if his plan seemed insane.

He also had a taste for poetry, often reciting bits of it. (TV: The Twin Dilemma, The Mark of the Rani, Terror of the Vervoids) On occasion, the Sixth Doctor would carry a multi-coloured umbrella that matched the clashing colours of his clothing (TV: The Two Doctors, The Mysterious Planet, Time and the Rani).

This Doctor also had a habit of walking in a direction other than his proclaimed intention. This quirk was later mirrored by his tenth incarnation and once by the eleventh incarnation, although these incidents were caused by a lack of knowledge of directions and post-regeneration "steering" problems, respectively.

Appearance
Physically, the Sixth Doctor was a tall man, with long, curly, blond hair. His last companion Mel thought him overweight, and forced him to take up both a diet, consisting mainly of carrot juice, and an exercise regime, neither of which he felt he needed. (TV: Terror of the Vervoids)

Clothes
The sixth incarnation's taste in clothes were the subject of much ridicule, though it was suggested that he wore his outlandish coat in order to distract people from noticing anything else about him. He once mentioned that his coat was the "height of sartorial elegance". (AUDIO: Jubilee) At some point, the Doctor abandoned his outlandish multi-coloured outfit for a more subdued blue costume, (WC: Real Time) though by the time of his regeneration, he had resumed wearing his original garb. (TV: Time and the Rani) The Doctor ran into a younger, amnesiac version of Mel, who liked his original outfit, which led the Doctor to wear it again for her. (AUDIO: The Wrong Doctors) This Doctor usually wore a variety of waistcoats and cravats to accompany his multi-coloured coat, each possessing a different colour and design. He first wore a knitted waistcoat that was dark brown in colour, along with a turquoise polka-dot cravat. (TV: The Twin Dilemma - Revelation of the Daleks) During and beyond the time of his trial by the Time Lords, he wore a bold red gingham dupion silk waistcoat accompanied by a red polka-dot cravat (TV: The Trial of a Time Lord, Time and the Rani). During his struggle with the Vervoids on the Hyperion III, the Sixth Doctor wore a pink, purple and green dupion silk waistcoat with a yellow cravat decorated with a starfield pattern (TV: Terror of the Vervoids). In the pockets of these waistcoats, he usually bore a neon-green watch chain.

This Doctor wore a number of other clothing points during his life. While confronting the Sontarans in Seville, Spain in 1985, the Sixth Doctor briefly replaced his usual outlandish coat and jerkin for an open, Hawaiian style waistcoat. (TV: The Two Doctors) On another occasion, he briefly wore a a blue cape over his usual attire as mourning for the supposed death of Professor Arthur Stengos on Necros. (TV: Revelation of the Daleks)Much later, while as Professor Claudius Dark, the Doctor wore typical clothing of the time period. (AUDIO: Jago in Love, Beautiful Things (audio story), The Lonely Clock (audio story), The Hourglass Killers) He wore a waiter outfit on "The Titanic". (AUDIO: The Wreck of the Titan)

Much like his late fourth and fifth incarnations, the Sixth Doctor also wore a plain white shirt with question marks embroidered on the collar (TV: The Twin Dilemma, et. al) Also, like his fifth incarnation, he wore braces adorned with question mark symbols. (TV: Vengeance on Varos, The Two Doctors) He took to wearing a set of striped, yellow trousers during this incarnation. His generally preferred footwear was a pair of orange spats over green ankle boots.

The sixth incarnation was very fond of cats, and always wore one of a number of cat-shaped pins or brooches on his lapel (in lieu of the celery stalks favoured by his predecessor). By the time of his tenth incarnation, however, he had developed a dislike for the animal. (TV: Fear Her)

Regeneration
Colin Baker declined an invitation to film the regeneration sequence at the start of Time and the Rani due to the circumstances of his dismissal from the role. His successor, Sylvester McCoy, donned a blonde wig and briefly appeared on screen as the unconscious sixth Doctor. McCoy's face was obscured from camera view, first by the TARDIS console and then by the regeneration FX, before the final reveal of the Seventh Doctor. McCoy thus became the first and only actor to play more than one incarnation of the Doctor.

Circumstances
Spiral Scratch by Gary Russell gives a "revisionist" account of the circumstances behind the Doctor's regeneration, explaining that it had not happened simply because he had hit his head. Love and War by Paul Cornell offered a different explanation, or at least implied one, although it should be noted that neither theory expressly contradicts each other. Spiral Scratch features the Doctor being weakened after having his chronal energy drained fighting the Lamprey, while Love and War implies that he deliberately flew into the tractor beam to trigger his regeneration, but it is possible that the injuries the Doctor sustained in the beam were simply made worse by his already weakened state and his incarnation could have otherwise lived for a while longer.

Other matters

 * According to an interview with Colin Baker in DWM 118, the Doctor's coat was created because John Nathan-Turner had the idea that it should be in "very bad taste" to show the Doctor's alien nature. He had wanted to wear black to reveal the Doctor's darker side.
 * In AUDIO: The Curse of Davros, the Sixth Doctor was played by Terry Molloy as the Doctor switched bodies with Davros in an attempt to reform the Daleks.

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