Twelfth Doctor

The Twelfth Doctor emerged from his predecessor's explosive regeneration on Trenzalore, being the product of "regeneration number thirteen." He was the first incarnation of the Doctor's second regeneration cycle, which had been bestowed upon him by the Time Lords. Clara Oswald, continuing her travels with him after he regenerated, served as his primary companion, and at times acted as his moral compass.

Assured of the survival of Gallifrey, he was no longer chained down by his guilt. A darker character with a withdrawn and spiky attitude, he was less amiable and habitually questioned his own goodness. Although this incarnation was no stranger to kindness and humour, he often dispensed with niceties in a tense situation, becoming cold and calculative in critical moments that required sound judgment and the occasional application of sharp practice.

However, because of his detachment from emotions, he could come off as unpleasant, fearsome, and ruthless. These qualities often terrified those who were around him, even his companions. He became harder to trust, and acknowledged his shift toward negative personality traits, feeling incensed and fearful at what he was changing into. However, after resolving his morality crisis, he started to show his lighter side more clearly.

Unlike his predecessor's adventures with Clara, this Doctor found more strain was being placed on their relationship; Clara was dating fellow Coal Hill teacher Danny Pink, whom the Doctor disliked.

Preparations
During a visit to a parallel universe where he was a fictional character in a television series, the Eleventh Doctor told his portrayer, Matt Smith, that Peter Capaldi, whom he had previously rescued from a Mandrel, would be a good choice to play him on the show. (COMIC: The Girl Who Loved Doctor Who)

Post-regeneration
After fighting in the Siege of Trenzalore for 900 years, (PROSE: Tales of Trenzalore: The Eleventh Doctor's Last Stand), the Eleventh Doctor, facing extermination by the Daleks, and already dying of old age, was ready to accept that he had reached the end of his life. Unable to accept that his death was unavoidable, Clara Oswald appealed to the Time Lords to intervene, and they responded by granting the Doctor a new regeneration cycle. After using the energy from the explosive reset that followed to destroy the Dalek forces besieging Trenzalore, the Doctor, still dying from old age, returned to his TARDIS to undergo his thirteenth regeneration.

Suddenly changing in a flash before Clara's eyes, the new Doctor voiced his surprise at having new kidneys. The TARDIS then began shaking violently, and the Doctor implied to have forgotten how to pilot his ship, much to a shocked Clara's dismay. (TV: The Time of the Doctor) Crashing in pre-historic Earth, the TARDIS was chased and subsequently swallowed by a female tyrannosaur; when the Doctor brought the TARDIS to 1890s London, the dinosaur was accidentally brought along with it.

After the TARDIS was spat out, the Doctor, in a severe bout of post-regenerative trauma, acted very wild and irrationally. He peeked out of the TARDIS door, shushed Strax, slammed the door shut momentarily, and then finally crept out of the TARDIS, trying to identify him as one of the Seven Dwarves. Unable to remember names or faces clearly, he sputtered at the sight of the Paternoster Gang, before being joined by a frazzled and annoyed Clara, trying to keep some degree of control on his livid and maddened state.

Though put to bed to stabilise, the Doctor soon awoke and, grabbing a piece of chalk, doodled strange equations all over the bedroom. Hearing the dinosaur in pain, the Doctor climbed out onto the rooftop and left on horseback when he saw the T-Rex was being burned to ashes. Deciding to investigate, but still suffering a degree of post-regenerative stress, the Doctor wandered the streets of London. Talking to a passing tramp, the Doctor examined his new facial features, taking particular note of his new eyebrows, as well as his new Scottish accent, before trading in his previous incarnation's favourite watch for the tramp's coat. (TV: Deep Breath)

Seeing an ad in a newspaper placed by, (TV: Death in Heaven) which seemed to be a message from Clara, the Doctor infiltrated a suspicious restaurant, where he and Clara learned that time travelling Clockwork Droids, under the leadership of the Half-Face Man, had been harvesting humans to repair themselves and reach the Promised Land. Trying to speak on peaceful terms, the Doctor snapped the Control Node out of his illusion of the Promised Land by revealing the true state of his existence. Conflicted and unsure, the Half-Face Man fell out of his escape pod, either jumping or having been pushed by the Doctor. (TV: Deep Breath)

The Doctor briefly left Clara behind to redecorate the TARDIS console room and settle on a new outfit. Returning for Clara, the Doctor spoke of the suspicious way Clara had met him in his previous incarnation, only for Clara to likewise voice her uncertainty of the Doctor's identity and asked to be returned home. Attempting to return Clara home, the Doctor ended up in Glasgow by mistake. However, Clara decided to go out for coffee with the new Doctor after the Eleventh Doctor called her and encouraged her to help the Doctor through his regeneration. (TV: Deep Breath)

Am I a good man?
Leaving Clara behind in Glasgow to get coffee, the Doctor shared an adventure with a mutant called 78351 during his quest for coffee. (PROSE: Lights Out)

Intending to return with the coffee, the Doctor saved a Combined Galactic Resistance fighter pilot named Journey Blue from a Dalek Saucer attack, though left her brother behind in the explosion. After prompting her into asking nicely, the Doctor returned Journey to her command ship, the Aristotle, where Colonel Morgan Blue introduced him to a Dalek that had developed a fault and turned good.

Returning for Clara, three weeks later from her perspective, the Doctor asked her if she thought he was a good man, a question that Clara found herself unable to answer, and returned to base to help the Dalek. Joined by Journey and two other soldiers named Gretchen Carlisle and Ross, the Doctor and Clara used a Molecular nanoscaler to miniaturise themselves and enter the Dalek — whom the Doctor nicknamed "Rusty". After losing Ross to the Dalek's antibodies, the Doctor discovered a radiation leak from within the Dalek and learned that Rusty had turned good after seeing a star being born. Following the radiation, the Doctor discovered damage to Rusty's power source was slowly killing him, and repaired the damage with his sonic screwdriver.

However, fixing Rusty's power core resulted in the malfunction that turned Rusty good to be reversed, with Rusty's destructive nature returning, and causing Rusty to go on a killing spree, as well as send a distress beacon to summon the Daleks to the rebels' base. After getting slapped and lectured by Clara for his apathy, the Doctor realised he could turn Rusty good again by reawakening his memory of the star being born.

Instructing Clara to find a way to restore Rusty's memories of the star, the Doctor made his way to the Kaled mutant within Rusty to mind linked with him, causing Rusty to see the Doctor's hatred of the Daleks and destroy the Daleks that had responded to his distress beacon. Leaving to continue his crusade against the Daleks, Rusty commented that Doctor would have made a good Dalek before both of them left. After declining Journey's request to travel with him and Clara, the Doctor returned Clara home, both still unsure if the Doctor was a good man, but with Clara convinced he was at least trying to be one. (TV: Into the Dalek)

New adventures with Clara
Spending some more time on his own, the Doctor became alerted to a creature that disguised itself as a motorway to consume planets into other dimensions. Summoning Clara to assist him, the Doctor was surprised when the creature disappeared, unaware that Clara had tricked the creature into consuming itself. (COMIC: Road Rage)

He and Clara then returned to Victorian London and assisted the Paternoster Gang in defeating the scheme of Orestes Milton to weaponise people. (PROSE: Silhouette)

Deciding to give Clara the choice of their next destination, the Doctor took her to Sherwood Forest to meet Robin Hood, though he was sceptical of Robin's actual existence. He was proven wrong when Robin shot his TARDIS with an arrow seconds after they arrived; however, he refused to believe Robin and his Merry Men were real upon visiting their camp.

After participating in an archery contest for a golden arrow, the Doctor got himself, Clara and Robin captured by the Sheriff of Nottingham, who had allied with alien robots disguised as his knights. Escaping, the Doctor and Robin found out the robots were trying to reach the Promised Land, but lacked sufficient gold to repair their engine. Believing Robin was also a robot, the Doctor was re-captured by the Sheriff as Robin took Clara and escaped through a window. Leading a revolution in the Sheriff's dungeon, the Doctor was informed by the Sheriff that Robin Hood was not a robot, just as Robin came to his rescue and defeated the Sheriff. Assisting Robin with Clara's help, the Doctor helped launch the golden arrow into the ship to allow it to escape velocity and explode harmlessly in space.

Robin, having learned about the Doctor's story from Clara, noted that the two of them were not so different from each other. Both of them were people born into status and privilege, giving up both to live the life of an adventurer in order to fight injustice. (TV: Robot of Sherwood)

The Doctor and Clara used a goo bomb to foil the Sibro's attempt to weaponise a Conlanian clock tower, (COMIC: Chime Time) orchestrated a ceasefire in a war between anthropomorphic cats and dogs by allying them against an army of alien fleas that planned to attack every planet in the universe, (COMIC: Once Bitten) and helped the World Brain find a new way of life after crash landing on its factory planet. (COMIC: Crash Landing)

While sightseeing on the HomeWorld, the Doctor saved a hospital from a missile, but was framed as the ringleader of various crimes by the Judge and locked up in the colony's asteroid prison until he exposed its darkest security measure. (PROSE: The Blood Cell)

The Doctor and Clara rescued the spaceship Genetrix from Whispies on Venus by using the ship's sifters to suck them up. (PROSE: Sunset Over Venus)

On Hoopoe, the Doctor acted as Clara's lawyer when she was arrested for walking on the ground by the Court of Birds. His attempt to convince them she and him weren't cats backfired when the owls accused them of being mice, but the Doctor had foreseen this and had recruited the native cats to attack the owls with makeshifts wings, but ensured that the wings were too difficult to use properly, rendering them useless in the cats' pursuit of the owls. As he left with Clara in the TARDIS, the Doctor rewarded the cats with a box of canned tuna. (COMIC: The Court of Birds)

During one of Clara's breaks from the TARDIS, the Doctor became obsessed with the idea that a creature designed to hide was following him around and that everyone was similarly being followed. Visiting Clara for help in finding the hiders, by using the TARDIS telepathic circuits to pilot into her past. However, Clara got distracted by a phone call from her date, Danny Pink, and piloted them into his past instead, back when Danny was a child called Rupert and living in a care home. Finding a figure under Rupert's bed sheet, the Doctor had Clara and Rupert turn their backs to allow the being to walk out the room unobserved, leaving them unsure if it really was a creature or just another child playing a trick on Rupert.

Returning Clara to her date, the Doctor continued to follow his theory by trying to use a trace of Clara left in the telepathic circuits, ending up at the end of the universe where a time traveller named Colonel Orson Pink, Danny's descendant, had been trapped for six months. Intrigued by how following Clara's timeline led him to Orson, the Doctor returned for Clara and had them wait at the end of the universe for the night, believing it to be the perfect time to find out if the hiders were real. Finding a chance to confront the creature outside the ship, the Doctor sent Clara into the TARDIS and seemed to get a look at what he's been chasing before the atmospheric shell broke and Orson had to rescue him. As the Doctor was knocked out, and the TARDIS seemed to be under attack, Clara used the telepathic circuits to fly the TARDIS away.

Waking up to find Clara gone, the Doctor called out to her and inadvertently alerted his younger self to Clara's presence. Before he could investigate, Clara re-entered the TARDIS and made him promise to leave and not find out where they had landed. Afterwards, the Doctor returned Orson and Clara to their own times and, satisfied by what he had learned, underlined the word "Listen" that the creature had written on his chalkboard. (TV: Listen)

The Doctor planned to rendezvous with Clara at Coal Hill School, but instead arrived at a replica of the school on an unnamed planet, where Clara and Jeff Delobel, a French teacher, had been abducted by primitive aliens planning to infiltrate Earth via Coal Hill School. In order thwart the invasion, the Doctor told the aliens a tale of Earth's Guardian, informing them that he was the guardian, scaring the aliens off. (COMIC: The Monsters of Coal Hill School)

Resuming their travels, the Doctor and Clara helped stranded Seevith launch their ship, (COMIC: More Than Meets the Eye) and helped Professor Faster end the 17th century witch trials. (COMIC: Witch Work)

Returning to pick up Clara, and persuade her to away from a date with Danny Pink in favour of other travel destinations, the Doctor received a call from Madame Karabraxos, who requested he free the Teller and its mate from the Bank of Karabraxos, as he had done on the day she met him. Realising the ramifications of this request, the Doctor built up the identity of "the Architect", using this identity to stage a bank heist for him to commit, with the assistance of Clara, an augmented human named Psi, and a shape shifting mutant human named Saibra.

Using memory worms to erase the plan from their minds and prevent the Teller from alerting the young Karabraxos, the Doctor and Clara found themselves already in the Bank with their accomplices, their last memory being the TARDIS phone ringing.

Receiving instructions from the Architect on their location, objective, and the Bank's security system, the team infiltrated the Bank. Entering a safety deposit box, Team Not Dead - the Doctor's name for the assembled team - set of a dimensional shift bomb into a service corridor, where the team found a briefcase containing six teleporters disguised as atomic shredders.

Seemingly losing Saibra and Psi to the shredders when the Teller locked onto them, the Doctor figured out that time travel was involved with the heist plan when a perfectly-timed solar storm unlocked the Bank's vault. Retrieving what the Architect had promised Psi and Saibra as payment, the Doctor and Clara were caught by the Teller and delivered to the bank manager, Ms. Delphox. After Delphox left them to be executed, the Doctor and Clara were saved by Psi and Saibra, who revealed the true nature of the "shredders".

Venturing into the Bank's private vault to find his and Clara's reward, the Doctor instead found Director Karabraxos, and discovered that Delphox, as well as a majority of the bank's staff, was an exact clone of Karabraxos. Seeing Karabraxos' hatred of her own clones caused the Doctor to have an epiphany on the identity of the Architect, and he gave his phone number to Karabraxos as she fled from the solar storm about to hit the Bank. Subjecting himself to the Teller's powers, the Doctor regained his lost memories and realised the true objective of the bank heist. Freeing the Teller and its mate to a place to live in solitude, the Doctor then parted ways with Psi and Saibra, giving them their rewards, and returned Clara home for her date. (TV: Time Heist)

The Doctor and Clara were later pitted against the Wyrresters during their second attempt to invade Earth, with the Doctor also travelling back to ensure the failure of their first attempt and Clara briefly switching bodies with a Wyrrester before they were defeated. (PROSE: The Crawling Terror)

The Doctor and Clara were left to the mercy of sand piranhas while chained to posts on a Desert planet, rendezvoused with fish people, (TV: The Caretaker) were saved from an Aaraanandal slime beast by a survivor of the 22nd century Dalek invasion named Simon, (PROSE: When the Wolves Came) outran soldiers to escape in the TARDIS, (TV: The Caretaker) and saved a small village from a Cephla at Christmas. (COMIC: Gift Snatched!)

Planning to visit Eden 2, the Doctor was joined by a reluctant Clara, after she phoned him to drop her off at work after she overslept. When the duo arrived, they found the under assimilation by the Vladlack, but it turned out that the planet was a trap, to lure in and arrest invaders of planets. Fearing that innocents could be inappropriately punished, the Doctor set up a warning beacon around the planet, then dropped Clara off at Coal Hill School. (COMIC: Freeze)

Meeting Danny and Courtney
Discovering a Skovox Blitzer near Coal Hill School, the Doctor went in "deep cover" as the school's temporary caretaker to dispatch of the killer robot, much to Clara's dismay.

Initially planning on using chronodyne generators to send the Blitzer into the future, the Doctor's plan was accidentally foiled by Danny Pink; Danny had seen the Doctor act suspicuously and believed the devices were of malicious intent, deactivating some. As a result the Blitzer was sent a short time into the future, rather than centuries. After Clara introduced him as her boyfriend, the Doctor took a dislike to Danny as he was a former soldier and feared he wasn't good enough for Clara. He changed his plan to using a communication device to make the Blitzer think the Doctor was its superior.

Rather a few days, the Blitzer returned during the next evening; to the Doctor's surprise, Danny used his military training to help keep the Blitzer occupied, allowing him to repair the malfunctioning device. After successfully commanding the Blitzer to deactivate with Danny's help, the Doctor took into space and ejected it from the TARDIS, taking Clara's troublesome pupil Courtney Woods with him after she discovered his identity, deciding that there was no harm in having Courtney tag along as a travelling companion, (TV: The Caretaker) but didn't see anything special in her. (TV: Kill the Moon)

Further adventures with Clara
The Doctor and Clara travelled to the planet Isen VI, so that Clara could practice skiing for a school trip. Although the Doctor remembered it as a very cold and snowy planet, it had been converted to a warm and tropical paradise. After rescuing Clara from monkey-like creatures, the Doctor found an artificial leaf, which led to him and Clara being accused of trespassing by the planet's owner, Kano Dollar. The Doctor found that as a result of the planet's manipulation a global cataclysm was imminent, but Dollar wouldn't listen. The Doctor and Clara rescued two workers from an underground earthquake with the TARDIS and moved to a cavern beneath the tower. The Doctor had discovered a Gallifreyan signal and wanted to investigate. They found a giant terraformer, which had fused with a ship underground. From the ship came a Hyperion called Rann-Korr, who announced the universe would fall.

The Doctor released the ship's coolant gases, allowing him and the others to escape to the TARDIS. He explained that Rann-Korr's reanimation was a result of the terrorformer's work, and conceded he had no plan to defeat him. They returned to the surface and made plans with the workers. The Doctor returned to confront Rann-Korr in a last stand. As Rann-Korr prepared to kill the Doctor, the terrorformation was reverse-engineered, returning the area of Isen VI around him to its original icy state. The Doctor escaped in the TARDIS, and Rann-Korr was extinguished in the cold. He and Clara bid farewell to the workers and left. (COMIC: Terrorformer)

While Clara was having her portrait painted by Leonardo da Vinci in 1505, the Doctor received a summon to 2315 India from an old acquaintance of his, Tiger Maratha, who foresaw a timeless evil. The Doctor and Clara arrived in 2315 to find he had been killed and drained of life, and along with Tiger's daughter Priyanka were confronted by police who attempted to arrest the Doctor. Escaping capture, Priyanka told the Doctor and Clara that Tiger had worked for a group known as the Family Scindas. The Doctor, Clara and Priyanka travelled to the Scindas' ancestral home to find information, however the Doctor stumbled through a dimensional door into 1825 India, where he was attacked by a demon but rescued by renegade amazon Rani Jhulka. The Doctor and Rani found a necro-cloud harvesting the spirits of the dead, and then attacked by more of the demons. Before they could be overpowered by the demons, the TARDIS arrived, Priyanka having unintentionally activated the telepathic circuits. She told the Doctor Clara had been taken by the demons.

Back in 2315, the Doctor, Priyanka and Rani found a final recorded message from Tiger made before his death, in which he explained he had collected three of the four mythic swords of the goddess Kali for the Family Scindas and had a premonition of evil over the swords. The Doctor was then summoned to see Chandra Scindas, the patriarch of the Scindas family. The Doctor deduced that they were beings known as the Kaliratha, putting themselves throughout time and space and Hindu mythology. Chandra revealed he had Clara hostage, ready to be burned by the Exodus rocket, forcing the Doctor to agree to find the fourth sword of Kali for them. The Doctor, Priyanka and Rani collected the fourth sword and returned to Chandra, who revealed he had used Clara as a host for the resurrection of Kali. Priyanka took control of the rocket while the Doctor battled with Kali. The Doctor revealed he hid his sonic screwdriver in the fourth sword, so that Kali unwittingly freed the evil spirits from her and released Clara's body, while Rani killed Chandra. The Doctor, Clara, Rani and Priyanka then attended a festival in Mumbai. (COMIC: The Swords of Kali)

While attempting to hang flowers on the exterior of the TARDIS, the Doctor was spooked by a future Clara and fell out of the TARDIS into the orbit of an asteroid. When Clara's attempt to avert the crisis ended up causing it, the TARDIS was able to save the Doctor by creating a time field around him. (PROSE: A Long Way Down)

Picking up a signal, the TARDIS arrived on the Quartz Wastes of Asmoray. Although the Doctor believed it was an uninhabited wasteland, Clara pointed out there was a harvester nearby extracting electricity from the quartz. The Doctor and Clara were brought aboard the harvester by two workers, where beings within the electricity had broken through and killed four workers. Their leader, Luther, was insistent on continuing their work regardless. Investigating, the Doctor and Clara found the creatures were only attacking because they were being attacked - sucked into the harvester's storage batteries. With Clara's help, the Doctor was able to free the electricity beings back into the quartz. (COMIC: The Body Electric)

Heading for Rome, the Doctor and Clara wound up in a Germanic forest, where they were apprehended and taken into a nearby encampment. There they learnt that robotic mosquitos were spreading disease and killing off dozens of soldiers. Tracking the energy fields of the mosquitos to a tower in the woods, the Doctor discovered the occupants were using the mosquitos to search for a cure to a plague infecting their own world. The Doctor convinced them to leave. Although Clara was worried about the rest of the sick soldiers, the Doctor told her to leave them, saying that everybody dies. (PROSE: Silver Mosquitos) After stopping a hostile invasion in the future, the Doctor travelled to UNIT HQ, where he had just been in time to shut down a Void portal. The Doctor came into conflict with the Fractures, natives of the Void that possessed humans, who believed they had to drag anyone mark with Void stuff into the Void to protect reality from unraveling. The chaos was started by a UNIT scientist from an alternate Earth, Paul Foster, who wished to be with a version of his family. Recruiting UNIT, Kate Stewart and the Fosters' help, the Doctor and Clara opened the Void, drawing the Fractures back inside and freeing their victims. At Clara's insistence, the Doctor allowed the alternate Paul to join his family in their universe, knowing the Fractures were entirely out for him now. (COMIC: The Fractures)

The Doctor and Clara travelled to the Sands Hotel in 1964 Las Vegas after the Doctor found some tickets to see Frankie Seneca in a drawer. After proving to be a surprisingly good gambler, he caught the attention of Johnny Dragotta, who accused him of cheating. However, they were distracted when Mikey Nero, who was thought to have been killed, arrived, demanding control of the hotel. The Doctor unmasked Mikey as a disguised agent of the Cybock Imperium, who began attacking the hotel. While trying to immoblise it, the Doctor was grabbed and throttled by the Imperium, but was saved by Sonny Lawson.

The Doctor and Sonny discovered the Imperium's ships, and rescued Clara from their captivity. Clara gave the Doctor a Time Gun of Rassilon, which had been in the alien's possession. As the Imperiums attacked the hotel, the Doctor intervened and offered the aliens a game of Russian roulette with the gun. Although they agreed, the Doctor knew the gun would not work on a Time Lord, and it would self-destruct if one attempted to use it on a Time Lord. When the aliens' leader, Kronos, attempted to shoot the Doctor with the gun, it accordingly wiped away his timeline, and the other Cybocks with him. The Doctor, Clara and Sonny then finally went to see Seneca perform. (COMIC: Gangland)

After preventing the Lady of Neverness from breaching reality through the hundreds of photos being taken at the San Diego Comic-Con, (COMIC: Selfie) the Doctor and Clara attempted to go to Margate but ended up landing in 1845 Derbyshire, where they encountered a woman called Charlotte. They helped her to her lodge, the North Lees Hall. There, the Doctor accepted an offer from Lord Malborough to stay at the house upon learning of a mysterious "dreaming sickness". That night, the Doctor was attacked by a possessed servant, which he suspected to be linked to the sickness. The following day, during Malborough's preparations for a house party, the Doctor and Charlotte discovered a salvaged space vessel in a barn, the Doctor deducing that there was an alien influence to the sickness. They crashed the party to find Clara and the guests being attacked by a possessed Malborough with insects. Escaping the possessed guests, the Doctor and Charlotte discovered the source of the posessions was an Aranox, taking everyone's psychic energy. The Aranox refused to take mercy and attacked the Doctor and Charlotte with insects. However, Malborough was freed from his possession and attacked the Aranox with a lantern, setting it on fire and breaking the psychic control. As the house burned down, everyone escaped, but the Doctor felt guilty for the Aranox as it had been the last of its kind. As Charlotte left for a village with Malborough, she revealed her full name was Charlotte Brontë. Clara was humored to learn that the Doctor and the events of the story had been the inspiration for Jane Eyre, and suggested to him they go get some fish and chips. (COMIC: Unearthly Things)

Multi-Doctor event
The Doctor and Clara visited an alien world, which was not inhabited by any race or developed in any way, to the point that Clara doubted that it had a name. As the Doctor sulked at its emptiness, Clara discovered a hidden relic, where she discovered that a cataclysmic event was approaching which involved a picture of the Doctor with his previous two incarnations.

Clara asked the Doctor about the planet Marinus, where the picture was taken, but he did not remember the planet. That night, as the Doctor slept, Clara used the Telepathic circuits to travel to Paris, France in 1923 so she could convince two of the Doctor's previous companions, Alice Obiefune and Gabby Gonzalez, to help avoid the event.

The Doctor woke up to find the TARDIS in 1923 Paris, to find Clara missing from the TARDIS. He went to the Cafe, where his two previous incarnations also happened to be headed to meet their respective companions. The Tenth Doctor refused to consider the Twelfth Doctor a possible incarnation of himself, as he knew that he had only one regeneration left, and that the Eleventh Doctor was his successor. Although the Eleventh Doctor tried to break it up, the Tenth and Twelfth Doctors argued until they brushed fingers, causing a spark of the Blinovitch Limitation Effect. All three Doctors realised they had caused a paradox at a fixed point in time, resulting in the appearance of Reapers.

While the Reapers chased the Eleventh Doctor, the Twelfth and Tenth Doctors, Clara, Alice and Gabby ran back to the Twelfth Doctor's TARDIS, only to find the Reapers' presence had turned it into an empty shell. As the Eleventh Doctor returned, the three Doctors touched to send a narrow focus beam, docking their TARDISes together and restoring its exteriors. As the Reapers continued their pursuit, the group made their way to the Tenth Doctor's control room where the Twelfth Doctor set it to dematerialize, thus forcing the Reapers out. Although this worked, the Twelfth Doctor was worried about how his other selves would understand his actions. Clara encouraged him to have some "me time" and to work things out.

Back in Paris, Clara showed the Doctors a photo of them together on Marinus, which was in the circumstances of a catastrophic event. The Tenth Doctor realised that all three of them were connected as post-Time War Doctors. Unable to contain their curiosity, everyone traveled to Marinus to find out what would happen. There, they were attacked by a mysterious beam. The Doctors conversed over what had happened, little knowing that it was the actions of the Voord, who snapped the photo which had brought the three together just as they began bickering again.

The Voord began to attack, forcing everyone to split up and run into a maze. The Twelfth Doctor ended up running with Gabby, who criticized his views on others while the Doctor considered his current self to be more "wholemeal". Everyone ended up near a continuity bomb that exploded, creating three separate alternative timelines and trapping them in a loop. These alternative timelines included one where the Tenth Doctor allowed Wilfred Mott to die in the radiation chamber, one where the Eleventh Doctor allowed River Song to spare him on 22 April 2011 and finally one where the Twelfth Doctor would become an untrustful recluse inside the TARDIS after the betrayal Clara would commit against him. In order to escape from the loop the Doctors committed to the last alternative timeline assuming it to be the less dangerous one, so the Twelfth Doctor touched his alternate self to make them solid. The alternative Twelfth Doctor was surprised to see Clara again, but recognized everyone else and agreed to give everyone a lift. They materialized in a small pocket universe and were approached by the Voord who offered the alternative Twelfth Doctor a capsule. All of them were horrified to see the alternative Doctor merge with the suit, revealing that he planned all of this from the start and that he was the leader of the Voord.

The alternative Twelfth Doctor revealed that after Clara's betrayal, he found companionship and healing in the Voord city, which had been placed in the pocket dimension in the event of the undoing of their evolution. Upon learning there was a main timeline in which he did not find his happiness with the Voord, he had arranged the meeting of Doctors to ensure his timeline would be whole. He planned to erase the Tenth and Eleventh Doctors and Gabby and Alice's memories of the event but implant mental commands in the Twelfth Doctor and Clara's minds to ensure they would fall out in the betrayal, allowing the Twelfth Doctor to become him. As they were being led to have their memories altered, the Tenth and Eleventh Doctors staged a distraction, allowing Gabby and Alice to escape. The Doctors and Clara were then taken to the Conscience, where the alternative Twelfth Doctor began to alter their memories. (COMIC: Four Doctors)

Fallout with Clara
At Clara's urging, the Doctor took her and Courtney to the Moon in 2049, so that Courtney could be the first girl on the Moon to bolster her confidence. Landing instead in a recycled space shuttle heading for the moon, the Doctor was informed by Captain Lundvik that the moon had inexplicably gained mass, and that she and her crew were going to use nuclear bombs to dispose of the additional mass.

Investigating a disused mining base from a previous mission, the Doctor, his companions and the astronauts found corpses preserved in webs and research that suggested that the moon was disintegrating. Soon after, the group was attacked by a spider creature, which Courtney killed with washing up equipment, but not before Lundvik's crew were killed.

Taking a scared Courtney back to the TARDIS, the Doctor voiced his uncertainty of the Moon's fate to Clara, calling it a "gray area" in time. Exploring the moon's surface for the reason behind the deterioration, the Doctor, Clara and Lundvik discovered a horde of spider germs beneath the Moon's surface, as well as amniotic fluid, prompting the Doctor to investigate beneath the Moon for answers.

Scanning the Moon's core, the Doctor discovered that the Moon was, in fact, an egg for an ancient creature that was hatching. Reuniting with Clara and Lundvik after the shuttle and the TARDIS fell into a canyon, the Doctor informed them of his discovery after establishing contact with Courtney's phone. While Clara and Lundvik argued about killing the creature for the sake of the Earth, the Doctor had Courtney bring the TARDIS to him via DVD, deciding that it was not his place to decide the Moon's future, and left in his TARDIS for Clara, Lundvik and Courtney to decide on behalf of humankind.

After Clara chose to spare the creature, despite humanity voting for its death, the Doctor returned for the three women, taking them to a beach on Earth to see the creature hatch and the Moon harmlessly disintegrate in Earth's atmosphere. Confirming that the sight of the moon hatching kick started the humans pioneering into space, and seeing the creature hatch a new egg with same mass as the old Moon, the Doctor returned Courtney and Clara to Coal Hill School.

However, Clara, angered by the position the Doctor had put her in, asked the Doctor if he had known the egg was harmless, which the Doctor confirmed as true. Tired of the Doctor's apathy, Clara argued with the Doctor about how he had almost caused her to kill an unborn creature. He defended that he was helping the human race by not playing a part in this choice. However, Clara had been deeply hurt by the Doctor's constantly patronising attitude toward humanity, and now that he had demonstrated it with her, Clara felt reduced to the likes of an idiot in the Doctor's eyes. With tears rolling down her face, she told him to leave and not return for her. The Doctor was left stunned by her reaction and immediately took off. (TV: Kill the Moon)

Time alone
Spending some time away from Clara, the Doctor joined a crew of six travellers, including a young Geoffrey Chaucer, on a journey to the church at Santiago de	Compostela to avoid the plague. At the church, one of the travellers gave birth, then the group were attacked by life-feeding aliens disguised as wooden skeletons. However, the aliens recoiled in horror upon seeing the new baby. The Doctor realised the church was actually the aliens' disguised spaceship, and he and the crew escaped as the ship took off and away. The Doctor explained to Chaucer that the baby, representing new life, was enough to frighten away the death-conquering aliens. (PROSE: The Mercy Seats)

Responding to a distress call from Dalek prisoner aboard a Cyber Ship, the Doctor discovered that the Daleks, Cybermen and Sontarans were searching for the Orb of Fates to gain control of a powerful Time Lord weapon called the Starbane. The Doctor joined forces with the Dalek prisoner, who had been altered by the Cybermen and "seen the light" and nicknamed it "Lumpy". Following the Orbs' Artron energy to the Cyber-tombs of Telos, the Doctor restored a minimum of Lumpy's power, not trusting the Dalek to allow full use of its power, and sent him to retrieve the second Orb while he studied the first in the TARDIS.

As Lumpy descended into the depths of Telos, the Doctor discovered that the Orbs were powered by temporal energy; The only way to destroy them was to create a temporal implosion. Leaving Telos for Sontar, the Doctor and Lumpy were trapped in a stasis field by Major Skar, but the Doctor was able to open the field and allow Lumpy to escape undetected while he stayed behind as a diversion. After Lumpy acquired the last Orb and deactivated the stasis field, the Doctor escaped with Lumpy, deciding it best to stay clear of Sontar for a while. They next travelled to the Starbane. However, Lumpy pointed out that it was already occupied by Daleks. When learning Lumpy was not turned to good, Doctor had found a way to access Lumpy's controls remotely and used this ability to destroy the Starbane. (GAME: The Doctor and the Dalek)

On Christmas Eve 2014, the Doctor teamed up with Ceri, an understudy, to fraught an Addos attempt to recreate a Mummers play by genetically altering actors from the Palace Theatre. (PROSE: Behind You)

The Doctor learnt that an invasion fleet of Megrati were planning to attack the planet of Lemaria, a plan he had previously stopped in his first incarnation. The Doctor send them an invitation to give them some time to talk. While waiting for them to arrive, the Doctor took part in a Freedom Day celebratory play about the original defeat of the Lemaria, playing himself. The Doctor realised his fifth incarnation, Adric, Nyssa and Tegan Jovanka were in the audience before the real Megrati arrived. As his past self and companions watched, the Doctor convinced the Megrati to leave the planet by threatening to destory their ships. (PROSE: The Constant Doctor)

Clara rejoins
Reuniting with Clara for a farewell trip, the Doctor took her to a space-bound Orient Express. He later confessed to her that he had chosen the destination with an inkling that something exciting would happen after having been lured with phone calls, mysterious summons and free train tickets.

After discovering the death of an elderly passenger, and urging himself to investigate, the Doctor went to the engine room to examine the dead passenger's Excelsior Life Extender, meeting Chief Engineer Perkins in the process, and learned the rumor of the Foretold. Seeking advice from Emile Moorhouse, a fellow passenger who was a Professor of Alien Mythology, the Doctor soon discovered a second death had occurred in the kitchen.

Confronting Captain Quell with his theory, but getting ignored, the Doctor joined Perkins and Moorhouse in the engine room to research the deaths. Calling Clara to update her, the Doctor discovered that she and Maisie Pitt were trapped in a storage cart with a sarcophagus. Fearing that Clara was trapped with the Foretold, the Doctor tried to rewire the door open, only to find the sarcophagus empty, and himself under arrest by the Captain for being a stowaway.

However, after witnessing a third death firsthand, Quell realised that the Doctor was right and allied with him, just as the Doctor deduced the true nature of the Orient Express; the passengers were all experts and scientists in specific fields of study, gathered there to study the Foretold. With a lab revealed and the hologram passengers disappearing, the train's computer, Gus, gave the scientists the necessary instructions and equipment. Losing Moorhouse to the Foretold, the Doctor and Perkins figured out that the Foretold was targeting the weaker passengers after looking at the medical history of the previous victims, just as Quell was killed by the creature, as he had post-traumatic stress, but not before he gave the Doctor the necessary description to defeat the Foretold.

Realising that Maisie was next due to her breakdowns, the Doctor told a reluctant Clara to bring Maisie to the lab. Arriving there, the Foretold appeared to Maisie, but the Doctor saved her by implanted a replica of her grief into his head, confusing the Foretold into thinking the Doctor was Maisie. Deducing that the Foretold was an ancient soldier augmented with technology, the Doctor surrendered, and, after a final salute, the ancient soldier crumpled to dust, with only the technology that kept him alive remaining.

With the objective completed, Gus released the air out of the cabin, but the Doctor beamed all the dying passengers into the TARDIS, and tired to hack Gus to find out who had created him, but this trigged a security measure, causing the train to self-destruct. Dropping everyone but Clara and Perkins off at the nearest civilised planet, the Doctor waited for Clara to awaken on a beach before explaining everything.

Back in the TARDIS, the Doctor invited Perkins to travel with him, but Perkins politely declined and he and the Doctor bade each other goodbye. Reflecting on a conversation she had with Maisie, Clara, having forgiven the Doctor, decided to continue travelling with him, telling the Doctor that her leaving was all Danny's idea. (TV: Mummy on the Orient Express) The Doctor landed on the Pollyanna, the first of the Ninth Era sunships, which had been on an expedition to circumnavigate the Sun. Seeing one of the Umbra come out of the Sun and enter a plasma intake, the Doctor rushed to the plasma lab and carried the injured Professor Alice Dubrovnik to safety. The Umbra, who had been trapped in the chromosphere for millions of years, began swarming the Pollyanna, anchoring the ship to the Sun to try and hijack it and use it as a way of reaching Earth. As the Umbra on board took on more humans as vehicles, the Doctor was ejected out of a plasma intake to attract the Umbra to his regret. He set up the final link to Alice's graviton inverter on the hull of the ship, allowing Alice to briefly boost the inverter and create a secondary gravity envelope, which inverted the gravity and the heat, freezing the Umbra on the ship to death. (COMIC: The Eye of Torment)

Trying to return Clara home, the Doctor instead landed in Bristol when the Boneless began draining power from the TARDIS, drawing it off course and causing the exterior to shrink. Sending Clara to find the cause, the Doctor re-entered the TARDIS to study the shrinking effect, only for the TARDIS to shrink further, trapping him inside. Equipping Clara with his psychic paper and sonic screwdriver, the Doctor used nanotechnology to hack into Clara's optic nerve and establish a visual contact with the outer world. After Clara recruited the aid of a local named Rigsy, pretending to be the Doctor while doing so, the duo discovered that creatures from a two-dimensional universe were killing and dissecting missing locals to understand their three-dimensional bodies.

After discovering that Clara had lied to him about Danny's approval, the Doctor realised that a mural dedicated to local missing people was in fact the missing people, killed and worn by the creatures as camouflage. With Clara leading a gang of surviving community servers, the Doctor theorised that the creatures were trying to communicate, and that the deaths were but a mere misunderstanding. When the theory was proved wrong, the Doctor invented a 2Dis — a device that could reverse the creatures' flattening abilities — as Clara and her gang retreated to an underground tunnel.

After Clara accidentally dropped the TARDIS onto a train line, the Doctor activated the TARDIS' siege mode to protect it from an oncoming train. Now unable to even open the doors, which had been removed by the activation of siege mode, and with the life support systems failing as the power drain continued, the Doctor congratulated Clara for being worthy of the title Doctor, unsure if she could hear him or even if she was still alive. Clara and Rigsy were able to trick the creatures into supplying the TARDIS with the necessary power to restore it to full working conditions. Naming his adversaries the Boneless, and declaring himself as "The man that stops the monsters." the Doctor banished them back to their home universe. The Doctor then took the survivors to the surface. (TV: Flatline) The Doctor tried taking Clara to the frost fair in 1641, but instead, was drawn off course and landed in the Sahara Desert in 1941, where they were captured by Nazis. While requesting business with Field Marshall Rommel, the Doctor learnt from Rommel that Germany's allies, the Tuareg tribesmen, had made new extraterrestrial allies. The Doctor believed it was urgent to see the Tuareg and went with Rommel to meet them. After being taken to the tribe's chieftain, Bhaki, to see these "men from the stars" Bhaki introduced the Doctor and Rommel to the Tuareg's new allies, the Sontarans. The Sontaran commander Kygon Brox, believing the Doctor was looking for the Sontaran world engine weapon, the Warsong, tried interrogating the Doctor with a mind scythe. The Doctor made the link go the other way, and Kygon explained the history of the weapon to the Doctor. He told the Doctor that the Warsong was taken to Earth, and that there was someone seeking the weapon after signals from it began increasing exponentially. The Doctor realised that the "highly decorated" Nazi officer Heinz Bruckner wasn't who he claimed he was, but a Rutan spy and watched from a distance as the Warsong was triggered.

Realising that Bruckner took Clara with him to the Warsong's activation, the Doctor came up with a plan to converge the Allied, Axis and Sontaran forces towards the still-forming Warsong to distract Bruckner while he and Rommel snuck into the Warsong and broke through its defences. The Doctor stopped Bruckner from conducting the milennia-old preset programming of the Warsong by using a Sontaran osmic projector to send Bruckner's trigger mechanism through time. Rommel threw Bruckner into the Warsong, killing him, while the Doctor destroyed the "orchestra" of the Warsong by using his sonic screwdriver to blow it up. Afterwards, he brought Clara to the frost fair. (COMIC: The Instruments of War)

After spending some time on his own, the Doctor landed in London, only to find it and the rest of the world overrun by trees after Maebh Arden, a student of Coal Hill Year 8 Gifted and Talented Group under Clara and Danny's care, looked for the Doctor after hearing about him in what Maebh believed was a thought that came from Clara. With his theories constantly being proven wrong, the Doctor came to the conclusion that the trees' sudden overgrowth was an act of aggression, while also dealing with Clara's students in his TARDIS after Clara and Danny arrived to collect Maebh, only for Maebh to slip away in the commotion, just as the Doctor noticed her homework had predicted the events of that day.

Following Maebh deeper into the forest, the Doctor discovered that a sentience identifying itself as "the life that prevail[ed]" had caused the overgrowth, in preparation for a devastating solar flare about to hit the Earth. Believing Earth doomed, Clara inquired him to use the TARDIS as a lifeboat, only to inform him that she had said that to get him back to his TARDIS so he could survive the catastrophe alone. Despite some reluctance, Clara eventually convinced him to leave. Immediately afterwards, having discovered upon further reflection that the trees were going to absorb the harmful solar flares by pumping the atmosphere with excess oxygen, "like a massive, highly inflammable airbag", the Doctor returned to Clara and explained his discovery to the Gifted and Talented Group.

When he was informed of a government operation aiming to destroy the trees, the Doctor opened every mobile network on the planet to allow Maebh the opportunity to deliver a speech written by the Gifted and Talented Group to leave the trees alone. With Danny taking the children to their homes, the Doctor and Clara watched the trees that grown around the world harvesting and extinguishing the solar fire in the TARDIS, and then returned to watch the trees disappear on Clara's balcony. (TV: In the Forest of the Night)

The darkest hour
The Doctor rejoined Clara for a trip, where she suggested they go see a volcano. As the Doctor set the TARDIS to go, Clara attempted to put a mood patch on his neck, but the Doctor realised what she was doing and turned it on her. Not realising she was drugged, Clara imagined being at the volcano and throwing all the Doctor's TARDIS keys into lava, to blackmail him to save Danny, who had been killed in a road accident. The Doctor refused, and Clara came out of her dream state after destroying all the TARDIS keys. Despite her betrayal, the Doctor agreed to search for an afterlife to find Danny.

The Doctor and Clara arrived at 3W, which held dead bodies in water tanks. They were greeted by, who identified herself as a greeting droid and kissed the Doctor as part of her greeting routine. They met Dr. Chang, who showed them the use of dark water in the mausoleum. Clara received a call from Danny, who was in the Nethersphere, and the Doctor and Chang left her to take it.

The Doctor and Chang discovered that the water tanks that held the bodies were being drained by Missy, who killed Chang and revealed that all the tanks held Cybermen, who were preparing to invade Earth. Escaping the building, which he discovered St Paul's Cathedral, the Doctor tried to warn away nearby people, but Missy called out his warnings as insanity, and told him it was too late. The Doctor asked for her identity, and, to his shock, Missy revealed she was, (TV: Dark Water) before she and the Doctor were apprehended by UNIT and brought aboard the plane Boat One, where the Doctor was made President of Earth to battle the Cybermen. Missy overpowered UNIT, killed Osgood, and attempted to kill the Doctor by blowing up the plane, but the Doctor survived his fall to Earth by skydiving into the TARDIS. He travelled to a cemetery and reunited with Clara, who was comforting a converted Danny. Missy arrived and, as a "birthday present", gave the Doctor control of all the Cybermen.

Missy planned to turn the Doctor into the leader of the new army, intending to prove that the two of them were not that different after all, believing that she had put him in the impossible position of either accepting control of the army and using it to 'save' the universe or letting humanity die and conquer the universe as the Cybermen. However, reflecting on his past, the Doctor realised that he was just a man in a box who travelled around to help where he could, proclaiming that he was not a good man, a bad man, the leader of an army or a President. He then turned command of the army over to Danny, realising that the teacher had held on to his love for Clara even with his emotions deactivated, who led the Cybermen into the clouds where they self-destructed and stopped the rainfall from converting the living. A devastated Missy told the Doctor he could find Gallifrey in its original location with coordinates she provided, but Clara threatened to kill Missy for what she had done, until the Doctor prepared to do it himself. However, a rogue Cyberman disintegrated Missy instead. The Doctor realised it was his old friend the Brigadier — resurrected as a Cyberman — helping him again. The Doctor saluted the Brigadier, fulfilling a life-long wish of his old friend, noting that the Brigadier would never be anywhere else but by his side when Earth and the Doctor faced their darkest hour.

The Doctor entered the coordinates Missy gave him into the TARDIS and looked at his location, expecting to find Gallifrey. However, it turned out the coordinates were false and led to nowhere. With his only way to find Gallifrey gone, the Doctor attacked the TARDIS console in a furious rage, before breaking down emotionally. Meeting up with Clara in a café, and believing that she was back with Danny, the Doctor lied to her that he had found Gallifrey so as to allow her to continue with her life. Upon hearing this, Clara told him that she was happy and ready to settle down with, and they both bid farewell and parted ways. (TV: Death in Heaven)

Dreaming of Santa
Some time later, the Doctor was attacked by a dream crab, which put him into a scenario where he was brooding alone in his drifting TARDIS, (TV: Last Christmas) and was snapped out of his funk as when he heard Santa Claus knocking on the TARDIS door, asking the Doctor what he wanted for Christmas. (TV: Death in Heaven)

The Doctor travelled to Clara's home and collected her from her rooftop, where she had also encountered Santa. Urging her to believe in him, they arrived at a North Pole base, which they found was under attack from dream crabs. Santa arrived to help with the problem, but Clara was attacked by a crab and fell into a dream state. As no one could find a way to remove the crab from her face, the Doctor let himself be attacked by one to get her out of her dream before the crab could kill her.

Entering Clara's dream, the Doctor found she was dreaming of spending Christmas with Danny, and learned that Danny was dead. The Doctor urged her to break out of the dream, after Danny bid her farewell. Waking up in the base, the Doctor came to the realisation that everyone in the base was dreaming, having been attacked by crabs after they arrived. They woke up from the dream and the Doctor and Clara prepared to leave, but Clara reminded the Doctor of Santa having been on her roof, and he realised they were still dreaming from different places and times. The infected personnel in the base began to attack the survivors, however, everyone managed to escape by dreaming Santa was flying them home. The Doctor, Clara and the base scientists flew over London as they each woke up back in their own times.

Waking up where he had been, the Doctor travelled to Clara's home and removed the dream crab attached to her, only to find it had been sixty-two years since he left her and she was now an old woman. Clara filled her in on the years, but the Doctor felt remorseful of leaving her when he did. Santa suddenly appeared and asked the Doctor what he'd do if he had another chance, and the Doctor woke up from his dream, this time for real. He saved the younger Clara from the crab. Spurred on by what could have happened to her, the Doctor invited her to resume her travels with him, and she accepted. They set off together in the TARDIS, the Doctor remarking that he rarely got second chances with his companions, and commenting that he didn't know who to thank for this one. (TV: Last Christmas)

Second chance with Clara
Discovering that a group of aliens were going to turn a planet of anthropomorphic pink hippopotami into stone, the Doctor intercepted the aliens at the early stages of their invasion and led them to ancient Egypt, where they petrified a large cat-like alien, creating the Sphinx and getting crushed in the process. He and Clara then returned to the planet of the anthropomorphic pink hippopotamuses to reverse the petrified effect. (COMIC: Petrified)

The Doctor and Clara turned Captain Ratlett's crew against him and showed them a better life, (COMIC: The Wheelers) were almost consumed by robotic bananas for stealing food from the moon Luna Schlosser, (COMIC: Five a Day) and saved the Cloud City of Mirmi 24 from being eaten by an alien snake. (COMIC: The Very Hungry Snake)

The Doctor attempted to take Clara to Blackpool, but they ended up arriving in 2089, by which point the pleasure beach had become an overgrown jungle. The Doctor befriended and named Meghan, a wounded donkey shot by a man called Triss, who was planning a hunting trip in hover pods powered by the Blackpool Tower. The Doctor shut down the power, ending Triss' hunting plans. The Doctor and Clara had a dance in a ballroom, and then he enjoyed a play in the water with Meghan. (PROSE: All the Empty Towers)

The Doctor and Clara travelled to a galactic auction in Earth's orbit where unclaimed storage was being bidded on, with the storage pod belonging to Hyphen T Hyphen, a reclusive collector, containing a mother Rigellan Hyper-Kraken, which began killing everyone when the pod was opened. Before the mother Hyper-Kraken's eggs could hatch, the Doctor widened the dimensional shunt's focus on the Hyper-Kraken, her eggs and the storage pods and safely transported them elsewhere. (COMIC: Space Invaders!)

Taking Clara to the Taj Mahal in India for a holiday, the Doctor was chosen to act as a hostage by Stellar Nexus while Nexus tried to get payment for Earth's supposed tax bills. When the Doctor challenged Nexus's claim by pointing out the illogic in his statement, and then insulted him by asking why he had never heard of Nexus's Empire, the Doctor was locked in a cell while an illusion of him was set against a dragon in a gladiator battle. When Clara managed to pilot the TARDIS into the Doctor's cell, the Doctor used his sonic screwdriver to deactivate Nexus's illusions, exposing that Stellar Nexus was a child-sized con artist whose entire Empire was an illusion. Sending the defeated Nexus away, the Doctor decided to treat Clara to a curry. (COMIC: Empire's Fall)

The Doctor took Clara to see the Lights of Tanzarr, but instead found that the Nameless Mist had entered his dimension and was threatening to devour the cosmos. Originally wanting to flee, the Doctor was convinced by Clara to save the inhabitants of Ferrous-Ferra, and was inspired to recruit Cold Steel to headline the "loudest rock show in history of sound". While Clara triangulated the transmissions to cover the local galaxy, the Doctor used the loud music to thwart off the Nameless Mist. With the day saved, the Doctor returned to the concert to celebrate with crowd surfing. (COMIC: The Big Hush)

After Clara accidently freed the Djinx from his imprisonment, the Doctor was trapped in his TARDIS by the vengeful entity. Sending Clara instructions on her phone, the Doctor was able to instruct Clara on how to defeat the Djinx and free himself. (COMIC: Doctor in a Bottle)

The Doctor and Clara went on a tour of Snowcap University in Antarctica in 2048. While taking a helicopter ride, they learnt that one of the students, Polly Evans, had stayed behind at the end of term to join the classified Project Sub-Zero. When another student, Quinn Norton, who also a part of Project Sub-Zero, was killed in a helicopter crash the Doctor and Clara narrowly avoided being on along with Polly's father George, they returned to Snowcap U to investigate. With the help of the spy Paul South, the Doctor found an ice cavern where the missing students had been experimented on, engineered by Dr Patricia Audley to survive in extreme cold. To their shock, the Doctor and Clara also met Winnie Clarence, one of Clara's splinters who refused to accept her only purpose was to save him. Paul and Winnie released most of the imprisoned humans from captivity.

The Doctor transmitted a signal with his sonic causing Dr Audley's animals to go wild. After feigning betrayal of the two, Winnie threw the Doctor the key to free the hybrid subjects from their cells, and saved the Doctor's life by pulling Dr Audley into a vat of liquid ice after Audley pulled a gun on him. Dr Audley was killed, but Winnie survived when she unwittingly had a syringe of Dr Audley's experimental blue blood serum injected into her, allowing her to live inside the ice. Clara realised that this meant that not all of the splinters died saving the Doctor, and several of them had lives of their own. (COMIC: Blood and Ice)

Following Clara's request to meet the Greek storyteller Homer, the Doctor found himself drugged by an innkeeper and bound to a post with Homer and Clara to be fed to a bunch of Cyclopes. Before he could be eaten, however, the Doctor managed to convince the Cyclopes to listen to Homer's harp, and the young man's music soothed the hungry Cyclopes to sleep. Using a Sub-conscience reading reality device, the Doctor discovered that the beasts were refugees from a war that had destroyed their world and, after using his device to convert them to a vegetarian diet, the Doctor let Clara convince them to live in peace in the hills. (COMIC: Doctor on the Menu)

The Doctor and Clara visited the liberation of Paris in World War II, where they thwarted a plan by the Darapok Empire to brainwash humanity into destroying itself by destroying their transmitter on the Eiffel Tower, and then frightening them off. (COMIC: Trust)

The Doctor learnt from a friend of his, Hitch, that a sentient superweapon called the Hadax Ura had gone missing. Hitch was putting together a recovery team and needed the Doctor's technical expertise. The Doctor agreed to join the team, dragging Clara away from her class to assist. As the ship carrying the team headed for the planet carrying the weapon, Unnamed BX-4, the Hadax Ura shot the ship down, revealing the weapon's location, but everyone on board was able to escape with jetpacks. Clara was attacked by pterosaurs and dropped into the Jungle. The Doctor went off on his own to look for Clara, and found Clara with an organic avatar who had taken on the appearance of Danny. The avatar told them that the Hadax Ura had been "devouring" the Jungle, and turning its indigenous life into an army, and asked them either to destroy the weapon, or to take it elsewhere. The Doctor realised that this meant it intended to end the war between the Hub Alliance and the Axis Worlds, and the Hadax Ura began augmenting Clara and Mr Wiremu to become its footsoldiers. (COMIC: Spirits of the Jungle)

Undated events

 * The Twelfth Doctor helped his previous incarnations place Gallifrey in a pocket universe at the end of the Last Great Time War. (TV: The Day of the Doctor)
 * The Twelfth Doctor was forced to disguise himself as a nun to escape the Church of Vindication's Inquisitors. (COMIC: The Swords of Kali)

Personality
A cynical man armed with a dry, acerbic wit, a brutal honesty and a lot of internalised anger, the Twelfth Doctor was a radical change from his predecessor, adopting a less caring attitude and more hostile nature, (TV: Into the Dalek, Robot of Sherwood, The Caretaker, Kill the Moon, Flatline, Dark Water; COMIC: Terrorformer) though he believed he gave people the benefit of the doubt. (PROSE: The Blood Cell) He was perfectly comfortable with placing his companions in danger if it meant appeasing his curiosity, often leaving them out of the details in his plans, or using them to distract attention away from himself. (TV: Deep Breath, The Caretaker, Kill the Moon, Mummy on the Orient Express) However, if he believed the situation was too dangerous for them, the Doctor would send his companions to the safety of the TARDIS while staring down the threat alone. (TV: Listen)

Despite coming across as uncaring, with a complete disregard for social niceties, he would fight to protect those in his care, and he would react with devastation if harm befell them. Such was his reaction to the death of a female Tyrannosaurus rex that had been inadvertently dragged through time by the TARDIS, (TV: Deep Breath) and to the death of Guardian Gillian Donaldson. (PROSE: The Blood Cell) However, for the most part, the Doctor was detached and occasionally callous, reacting with indifference during his first encounter with Journey Blue, who had just lost her brother, (TV: Into the Dalek) and laughed at Orson Pink's name, though he apologised for the latter. (TV: Listen)

The Doctor also showed a strong compassionate streak, running into a burning libary to save Lafcardio from being ejecting into space, (PROSE: The Blood Cell) putting himself in harm's way to save Maisie Pitt from the Foretold, (TV: Mummy on the Orient Express) and assisting Clara in finding Danny in the afterlife, even after she had attempted to blackmail him. (TV: Dark Water)

While he described himself as having had "sophistication and timeless sartorial elegance" restored, (COMIC: Terrorformer) the Doctor was not above acting childish; requesting a children's menu at Mancini's Family Restaurant, (TV: Deep Breath) sliding down stairs and ladders, (COMIC: The Monsters of Coal Hill School; TV: Death in Heaven) wriggling his toes to make the pigs on his socks dance, (PROSE: The Blood Cell) whistling "Another Brick in the Wall" to annoy Clara, (TV: The Caretaker) ecstatically steering Santa Claus's sleigh, (TV: Last Christmas) and bickering with the likes of Robin Hood and Father Christmas. (TV: Robot of Sherwood, Last Christmas)

Even though he identified himself as a pacifist, (COMIC: Terrorformer) the Twelfth Doctor showed even less restraint than his predecessor, and would get frank and physical with his enemies. (TV: Deep Breath) However, he had a conflicted sense of morality and struggled with his inner darkness. While he sometimes voiced preconceptions about the Daleks or human nature, he often questioned his own judgement afterwards. Indeed, behind his cold exterior was a man who was extremely self-reflective, to the point where he questioned whether he was still a good man. (TV: Deep Breath, Into the Dalek) The Doctor was well aware of the fact that he often found himself in situations that forced him to make terrible decisions, (PROSE: The Blood Cell; TV: Mummy on the Orient Express) and believed he was "overbearing, manipulative and consciously aware of his own intelligence." (TV: Time Heist) Eventually, he came to the conclusion that he was neither a good nor bad man, but rather just "an idiot, with a box and a screwdriver. Just passing through, helping out, learning." (TV: Death in Heaven)

Though he retained a respect for humanity, the Doctor would insult humans for being slow minded and violent, dubbing Earth the "planet of the pudding-brains." (TV: Deep Breath) Nonetheless, he tolerated the company of those who could engage him intellectually, as with Perkins and Osgood, (TV: Mummy on the Orient Express, Death in Heaven) and claimed to respect humanity enough to allow it to determine its own future without any interference from him. (TV: Kill the Moon) As with his previous incarnation, the Twelfth Doctor also liked people who got straight to the point, and thought that someone who wasn't scared in a life-threatening situation was an idiot. (TV: Last Christmas)

Though he did not know the reason, believing it to simply be his old age, (PROSE: The Blood Cell) the Doctor expressed a strong dislike for soldiers, (TV: Into the Dalek, The Caretaker) though claimed his disdain was flexible in a crisis, (PROSE: The Blood Cell) and retained a respect for the Brigadier. (TV: Death in Heaven) He was also easily annoyed by swashbucklers who did not take things seriously. (TV: Robot of Sherwood) He also claimed to dislike liver, karaoke, mime, babysitters, bantering, salutes, (TV: Deep Breath, Into the Dalek, Robot of Sherwood, Death in Heaven) Candy Crush, pantomime, (PROSE: The Blood Cell, Behind You) outside interference, money, being taken prisoner, and cyclopses. (COMIC: Terrorformer, Doctor on the Menu)

He did, however, like babies and bicycles, which reminded him of Call the Midwife, as well as stars, candy floss, (PROSE: The Blood Cell, All the Empty Towers) and "a show-stopping entrance". (COMIC: Terrorformer) The Doctor had a liking for books, particular ones about Garfield, though he believed them to have been written by the cat as well, reacting with anger to those he believed burned books. He also believed that women who liked books to be the best kind. (PROSE: The Blood Cell)

Unlike his immediate predecessor, the twelfth incarnation was not an affectionate individual, failing to return Clara's hugs, or protesting against them, believing they were just another way to hide one's face, (TV: Deep Breath, Listen, Death in Heaven) but claimed them a good way to smell someone's hair. (PROSE: The Blood Cell) However, he hugged Clara to comfort her after she was almost shot, (PROSE: The Blood Cell) and again when they parted ways. (TV: Death in Heaven) He also expressed a dislike of holding hands with others, but made an exception with Clara. (TV: Last Christmas)

Uncomfortable with kissing, he was momentarily dumbfounded when Maid Marian pecked him on the cheek in gratitude for saving her, (TV: Robot of Sherwood) and reacted with horror after he was snogged by. (TV: Dark Water) However, he pecked Missy on the lips in gratitude for forcing him into self-reflection, (TV: Death in Heaven) kissed Clara's forehead while complimenting her brilliance in a moment of excitement, (COMIC: The Big Hush) and also gave Meghan, a donkey he had befriended, a kiss on the head when he thought no one was looking. (PROSE: All the Empty Towers)

Though he initially stated that murder was against his "programming", the Doctor showed a willingness to kill the Half-Face Man if he had to, though with some reluctance, first offering him a drink of alcohol and trying to persuade the clockwork droid to self-destruct of his own free will before engaging in fisticuffs. (TV: Deep Breath) He also stated that, despite how much he hated him, he had no intention of killing the Architect, (TV: Time Heist) but was willing to kill to spare Clara from doing it. (TV: Death in Heaven) He also released the Judge on a group of Guardians in an elaborate bid to gain their trust, resulting in the death of Chandress, (PROSE: The Blood Cell) and orchestrated the deaths of two Kaliratha that were keeping him prisoner by taking them to a point in time prior to their bodies being discovered. (COMIC: The Swords of Kali)

Unlike his immediate predecessor, the Twelfth Doctor was unwilling to alter the Web of Time, believing it was okay to send people to their deaths if history recorded them as deceased, (PROSE: The Crawling Terror; COMIC: The Swords of Kali) and also refused Clara's request to save Danny Pink from being hit by a car due to it being a part of her timeline, and undoing it would cause a paradox. (TV: Dark Water)

Much like his seventh and war incarnations, the Twelfth Doctor was heavily inclined to err toward a greater good and was willing to allow a few inevitable deaths if it meant saving the majority. Through this attitude, he acted like a pragmatist that would not hesitate to abandon someone whose fate was already sealed, nor mourn for an ally until his objective had been reached. (TV: Into the Dalek, Time Heist, Mummy on the Orient Express) However, the Doctor was still willing to save people if their deaths were not an immediate inevitability, desperately yelling for people to flee from St. Paul's Cathedral when the Cybermen began their invasion, (TV: Dark Water) and attempting to save Albert Smithe from the Dream crabs. (TV: Last Christmas)

Also like his previous incarnations, he relied on his companions to keep him from succumbing to his darker nature, but, unlike his predecessors, the Twelfth Doctor actively praised them for it, even claiming that Clara Oswald needed a "raise" for dealing with him. (TV: Into the Dalek) He also enjoyed it when they asked him obvious questions, claiming that it helped him think. (PROSE: The Blood Cell)

In stark contrast to his previous incarnations, the Twelfth Doctor was more willingly to leave a situation if he believed he had nothing to contribute; abandoning Jason Clearfield when he could not offer medical assistance, (PROSE: The Crawling Terror) abandoning soldiers dying of diseases after solving the mystery of the source, (PROSE: Silver Mosquitos) leaving Clara, Courtney Woods and Captain Lundvik to decide the fate of the Moon when he felt it wasn't his place to decide for them, (TV: Kill the Moon) and leaving the North Pole base immediately after defeating the Dream crabs, despite Clara claiming the team was still in danger. (TV: Last Christmas) The Doctor justified his attitude by pointing out the dangers of everyday life, claiming that "[everything is] dangerous if you want it to be", and once pointing out to Clara that he was not humanity's mother. (TV: Kill the Moon, Last Christmas)

By his own testament, the Twelfth Doctor did not suffer fools gladly, (PROSE: The Blood Cell) nor did he tolerate poor manners, even when held at gunpoint, and he believed that one should make requests politely, as well as avoid bad language. (TV: Into the Dalek, Kill the Moon)

Despite his grumpy nature, the Doctor got along well with children, giving Rupert Pink an enthusiastic pep talk about fear being a super power, (TV: Listen) and comparing the TARDIS' dimensions to the sugar in a coke bottle for Maebh Arden. (TV: In the Forest of the Night) After realising he had hurt Courtney Woods's feelings, he decided to take her and Clara to the Moon, so that Courtney could be the first girl on the Moon, to help her feel special. (TV: Kill the Moon)

An absent minded incarnation, the Twelfth Doctor had trouble recognising people's age group, (TV: Into the Dalek, The Caretaker, Kill the Moon, Last Christmas) often neglected to ask for people's names because they "weren't his area", (TV: Deep Breath, In the Forest of the Night) believed that minor clothing changes hid his identity, (TV: The Caretaker) could not grasp the concept of an English lesson, (COMIC: The Fractures) and failed to understand Dr. Chang's joke about the application of dark water in public swimming pools. (TV: Dark Water) He would also make contradictory statements, such as dismissing himself as a hero at one moment (TV: Robot of Sherwood, Death in Heaven) to later proclaiming himself as "the man who [stopped] the monsters". (TV: Flatline)

The Twelfth Doctor believed that education came quicker in life threating situations, and claimed that begging "wasn't [his] style", (COMIC: Terrorformer) unless his friends were threatened. (COMIC: Spirits of the Jungle) He also didn't care about sexuality, instead being bothered by people hating each other, and didn't approve of revenge. (COMIC: The Swords of Kali)

He listed "investigating", "playing with time" and "resistance" among his specialties, (COMIC: Terrorformer, The Swords of Kali, The Fractures) with Clara adding "interfering and infuriating" to the list. (COMIC: Terrorformer)

After redecorating his console room, the Doctor designed it with a more lived-in state, filling it with bookshelves, chairs, and workbenches, (TV: Deep Breath, The Caretaker) and even once having a meal in it with guests. (TV: Time Heist)

The Twelfth Doctor's hatred toward the Dalek species was rigid, with Clara describing it as "prejudice". He seemed conditioned to believe Daleks could not change and was closed-minded as he dealt with their presence. After his act of fixing a malfunctioning "good" Dalek caused it to revert to "evil," the Doctor was almost pleased that his belief of there being "no such thing as a good Dalek" was vindicated. (TV: Into the Dalek) Despite his hatred of them, the Doctor admitted to the Governor that the Dalek Emperor "[was] nothing compared to your average mobile phone sales assistant." (PROSE: The Blood Cell)

Additionally, the Twelfth Doctor was, at times, critical of his previous incarnations' clothing; thinking that his fourth incarnation's scarf "looked stupid", (TV: Deep Breath) and regarded his immediate predecessor's fondness for bow ties as "a bit embarrassing", (TV: Time Heist) but complimented Osgood's bow tie as "nice". (TV: Death in Heaven) According to Affinity, the Doctor kept his predecessors "lodged in his head", and held a low opinion of them and himself. (PROSE: Silhouette)

When he met his two previous incarnations, he had a frosty accord with the Tenth Doctor, who refused to consider the twelfth incarnation as a future incarnation until the Blinovitch Limitation Effect confirmed he was. Conversely, the Eleventh Doctor was willing to accept him as his next incarnation and was happy to know he had more life in the future. The Twelfth Doctor, however, expressed concern that the two would come to know him as the "scary Doctor". (COMIC: Four Doctors)

He disliked his immediate predecessor for his enjoyment of bow ties and fezzes, and overuse of the word "cool". (COMIC: Terrorformer) However, upon seeing Adrian Davies, a teacher at Coal Hill School with a resemblance to his previous incarnation, the Doctor, mistaking Adrian as Clara's boyfriend, arrogantly assumed that Clara was dating Adrian because of his uncanny resemblance to "a certain dashing young time traveller", reflecting more favourably to his predecessor. (TV: The Caretaker)

The Oracle described the Twelfth Doctor as "a man of taste and discrimination." (PROSE: The Blood Cell)

Both Clara Oswald and Kate Stewart viewed the Twelfth Doctor as an egotist. (TV: Robot of Sherwood; COMIC: The Fractures) However, when questioned by Lisa Foster, Clara reluctantly admitted she thought the Doctor was "kind of [cool]. In a strange sort of way", which Lisa interpreted as meaning "an uncool sort of way". (COMIC: The Fractures)

Much as his tenth incarnation expressed, the Twelfth Doctor associated regeneration with death, recalling Snowcap as "the place where he died". He viewed the process as "huge, [and] terrible", with his self-preservation preventing his memories of the experience from consuming him. (COMIC: Blood and Ice) He also believed that regeneration was to be used only when completely necessary, and to use it to fix a broken toe was "a waste of a life". (PROSE: The Blood Cell)

Habits and quirks
Much like his seventh incarnation, the Twelfth Doctor spoke with a Scottish accent, which he took as an entitlement to complain about things, (TV: Deep Breath) and was often prone to making subtle or climactic boasts. (TV: Deep Breath, Into the Dalek, Robot of Sherwood, Mummy on the Orient Express, Flatline)

When proposing a theory, the Doctor would use words such as "question" or "proposition", and would begin his conclusion with "answer" or "conjecture". (TV: Deep Breath, Listen, Time Heist) After working out the important questions in his head, he waited for others to come to the same conclusion, becoming increasingly annoyed with each wrong question or answer they proposed. (TV: Deep Breath)

When in a moment of realisation or thinking intensely, the Doctor would often tell people to "shut up", regardless if others would be speaking or not. (TV: Deep Breath, Listen,  Time Heist, The Caretaker) He would also issue the instruction to those who had earned his ire, regardless of their status or occupation, (PROSE: The Blood Cell; TV: Death in Heaven) and when he wished to avoid a subject of conversation. (TV: Dark Water)

Like the Ninth Doctor labelling humanity as "stupid apes", the Twelfth Doctor would call them "pudding brains" when he found them slow-minded or stupid. (TV: Deep Breath, Robot of Sherwood, Flatline) He would also accuse things, even other people, of developing faults when he didn't think they were working the way he though they were meant to. (TV: Deep Breath, Dark Water)

The Doctor often made puns, (TV: Into the Dalek, Flatline) used clever word play, (PROSE: The Blood Cell; COMIC: Terrorformer) or quoted classic fairytales. (COMIC: The Eye of Torment, The Swords of Kali)

Unlike his first and eleventh incarnations, the Twelfth Doctor had a tolerance for alcoholic beverages. (TV: Deep Breath, Time Heist, Mummy on the Orient Express) Much like his third and eighth incarnations, he took his tea with extra sugar. (TV: Death in Heaven)

Much like his predecessor, the Twelfth Doctor also used hand gestures to extenuate a point, but applied more dedication to his movements, standing firm, while speaking with conviction, though would become more spontaneous when thinking intensely. (TV: Deep Breath, Listen, Time Heist, The Caretaker) He also once mimicked his first incarnation's habit of holding his lapels in an attempt to order others around, much to the annoyance of the Tenth Doctor. (COMIC: Four Doctors)

He was also known to tap his teeth with his finger when thinking. (PROSE: The Blood Cell)

The Doctor made a habit of assigning nicknames to others, giving them names based on their appearance, by an accessory they carried or by their profession, (TV: Deep Breath, Into the Dalek, The Caretaker) owing to the fact he often chose to forget people, (TV: Last Christmas) and would insist on addressing them as their nickname, calling Danny Pink "P.E.", despite Danny being a Maths teacher, due to seeing him as more a PE teacher than Maths. (TV: The Caretaker, Death in Heaven)

When not out adventuring, the Doctor could be found jotting down equations and theories on various chalkboards in the TARDIS console room, or on hard surfaces that could bear chalk markings. (TV: Deep Breath, Robot of Sherwood, Listen)

The Doctor would occasionally offer out jelly babies in a similar way to the Fourth Doctor, but, unlike his fourth incarnation, the Twelfth Doctor kept his jelly babies in a cigarette case. (TV: Mummy on the Orient Express; COMIC: The Swords of Kali)

Skills
Highly observant, the Doctor was able to point out the Half-Face Man as non-human from his lack of interest in a burnt dinosaur corpse, and later noticed that he and Clara were trapped in a room full of Clockwork Droids because they weren't breathing, (TV: Deep Breath) as well as detecting a light shield aura, (TV: The Caretaker) finding Maebh Arden's "breadcrumb" trail, (TV: In the Forest of the Night) and foiling Clara's attempt to drug him with a sleep patch. (TV: Dark Water) He was also able to make accurate deductions from observing his surroundings, identifying the Aristotle as a medical ship within seconds of being on board, (TV: Into the Dalek) correctly deducing Captain Quell's backstory, and solving the riddle of the Foretold within sixty-six seconds. (TV: Mummy on the Orient Express)

The twelfth incarnation retained predecessor's ability to converse with other species, such as dinosaurs, horses, (TV: Deep Breath) and donkeys. (PROSE: All the Empty Towers) Much like his tenth incarnation, the Doctor also had a good sense of smell, which he used to assess his surroundings to deduce the time period he was in. (COMIC: The Swords of Kali)

Strong and durable, the Doctor was able to support his own weight single-handedly, wrestle the Half-Face Man into a corner, (TV: Deep Breath) withstand several blows from Abesse, (PROSE: The Blood Cell) and smash up the TARDIS console with his bare hands in a grief-stricken rage. (TV: Death in Heaven) Both the Half-Face Man and Kali noted that Doctor was stronger than he looked. (TV: Deep Breath; COMIC: The Swords of Kali)

Like several of his predecessors, the Twelfth Doctor was a highly proficient swordsman, able to best Robin Hood in a duel using a spoon, (TV: Robot of Sherwood) and take on Kali's three swords with a single blade. (COMIC: The Swords of Kali) He was also skilled in Venusian aikido, using it to defend himself from Abesse and disarming a distracted Robin Hood. (TV: Robot of Sherwood; PROSE: The Blood Cell) Even without his Venusian aikido, the Doctor proved to be skilled in unarmed combat. (TV: Deep Breath; COMIC: The Swords of Kali)

Despite initially forgetting how to pilot his TARDIS due to post-regenerative trauma, (TV: The Time of the Doctor) the Doctor soon mastered his way around the TARDIS console, being able to save Journey Blue by piloting the TARDIS around her, one second before her ship exploded. (TV: Into the Dalek)

Like his previous incarnations, the Twelfth Doctor also displayed telepathic abilities, being able to link his mind with Rusty to try and show the Dalek the beauty of the universe, (TV: Into the Dalek) clear the Governor's thoughts by tapping him on the head, telepathically communicate with Marianne Globus by placing his hands on her template, (PROSE: The Blood Cell) put Rupert Pink to sleep by placing his index finger on his forehead, editing his memories while he did so, (TV: Listen) putting Clara through a telepathic scenario with the aid of a sleep patch, (TV: Dark Water) and sending messages on blackboards to Clara while a Dream crab was sedating her. (TV: Last Christmas)

A credited escapologist, the Doctor boasted at teaching Harry Houdini "everything he [knew]", (COMIC: The Swords of Kali) and was repeatedly able to escape from his cell at the Prison. (PROSE: The Blood Cell) He was also a talented gambler, winning $800,000 in less than an hour, which he credited to simple mathematics, (COMIC: Gangland) and dancer, with Clara noting that he could apply for Strictly Come Dancing. (COMIC: Trust)

The Doctor possessed at least a limited medical knowledge, being able to resuscitate Lafcardio with artificial resuscitation after Lafcardio's lungs were filled up with soot, with the Governor noting that the Doctor worked on Lafcardio like an expert. (PROSE: The Blood Cell)

As cunning as his seventh incarnation, the Doctor was able to spin a fatal outcome into an advantage, such as using Ross's death to help him, Clara, Journey and Gretchen Carlisle escape Rusty's antibodies, (TV: Into the Dalek) or using the deaths of Emile Moorhouse and Captain Quell as an opportunity to figure out a way to defeat the Foretold. (TV: Mummy on the Orient Express) He was also able to organise a bank heist to save the the Teller and its mate, even erasing his planning of the heist to guarantee success. (TV: Time Heist)

The Doctor could not only perform eye-fixation hypnotism with verbal commands, but he claimed that, as a Time Lord, he could perform hypnotisms that effected all the senses. (COMIC: Trust)

Like his third incarnation, the Twelfth Doctor was a skilled inventor, being able to create an electron magnet and a sonic spoon in the Prison's craft workshop, (PROSE: The Blood Cell) a communication device to order a Skovox Blitzer to deactivate itself, (TV: The Caretaker) and a 2Dis to combat the Boneless. (TV: Flatline)

Appearance
While his predecessors began their lives looking young, (TV: The Parting of the Ways, The End of Time) the Twelfth Doctor started out appearing very much older. He had short grey hair, a hooked nose and sharp silvery blue eyes, with big ears. (TV: The Time of the Doctor) He was of a light build. (COMIC: Chime Time)

Most changed were his eyebrows, which went from "delicate" (TV: The Time of the Doctor) to extremely thick and furrowed. (TV: The Day of the Doctor) Startled by the change, the Doctor described them as "attack eyebrows", which could "take bottle tops off" and were "ready to set up their own independent state of eyebrows". (TV: Deep Breath) He later considered his intimidating eyebrows as both a major contributor to his gravitas, (TV: Time Heist) and the reason many viewed him as a hostile. (COMIC: The Swords of Kali)

Tall and gaunt, he was once described by Clara as looking like a "grey-haired stick insect", (TV: Listen) with Robin Hood describing him as "pale as milk". (TV: Robot of Sherwood) Shona McCullough described him as a "skeleton man". (TV: Last Christmas)

The Governor believed the Doctor had "a face for fury", and that it was "made up of storms" and "[boiled] away like a dying star". (PROSE: The Blood Cell)

The Doctor described himself as a "distinguished gentleman with [a] twinkle in his eye." (COMIC: The Swords of Kali)

Physically, he resembled Lobus Caecilius, a man he had met in his tenth incarnation, (TV: The Fires of Pompeii) with the Doctor himself noting that he had "seen [his] face somewhere before". (TV: Deep Breath)

Clothing
Immediately following his regeneration, the Doctor initially wore his predecessor's attire, a Victorian nightshirt, and then a coat that he "bought" from a tramp, before stealing a Clockwork Droid's suit in order to masquerade as one. (TV: Deep Breath) After having a chance to return to the TARDIS, though, the Doctor chose a new outfit for himself, with the intention of "aiming for minimalism", but instead felt that he "came out with magician" after solidifying his wardrobe. (TV: Time Heist)

The Doctor initially donned a navy blue Crombie coat and cardigan with a white collared shirt, matching blue trousers, and black brogue boots. Over the top, he sported a thigh-length, dark blue jacket with red lining, often wearing it with the top button done. On his left hand ring finger, he had a pair of gold rings, a normal gold band and a second ring with a greenish amber setting that rested atop the first band. (TV: Deep Breath) Occasionally, the Doctor would replace his cardigan with a waistcoat, with colours ranging in dark blue and plain black. (TV: Into the Dalek, Flatline) His socks were decorated with cartoony animals. (PROSE: The Blood Cell)

Though his Crombie coat remained a constant staple of his appearance, the Doctor would wear variations of his attire, switching from vested garments with a white collared shirt for simply a dress shirt on its own, such as purple, (TV: Robot of Sherwood) dark blue, (TV: Time Heist) or black with a white polka dot pattern. (TV: Kill the Moon) Other times, he would dispense with the shirt as well and don a black crew neck jumper with small holes on the front. (TV: Listen, The Caretaker, In the Forest of the Night) On at least one occasion, he also wore a black hooded top over this shirt. (TV: Last Christmas)

While imprisoned on The Prison, the Doctor was fitted with a standard orange uniform. (PROSE: The Blood Cell)

When going into "deep cover" as Coal Hill School's temporary caretaker, the Doctor donned a ocher brown warehouse coat over his black crew neck jumper. (TV: The Caretaker)

While aboard the spacecraft Orient Express, the Doctor wore a very formal attire consisting of a black double-breasted evening jacket, black trousers, grey waistcoat, his black brogue boots, a white dress shirt and a black cravat. (TV: Mummy on the Orient Express)

While visiting 1963 Las Vegas, the Doctor donned a blue Fedora at Clara's urging. (COMIC: Gangland)

Behind the scenes

 * Like the War and Ninth Doctors, the Twelfth Doctor debuted on television before his regeneration from his predecessor was screened.
 * His first words — "Kidneys! I've got new kidneys!" — keep to the modern tradition of new Doctors commenting on their bodies. Previously, the Ninth Doctor commented on his ears, (TV: Rose) the Tenth Doctor commented on his "new teeth", (TV: The Parting of the Ways) and the Eleventh on his legs. (TV: The End of Time)
 * In DWM 477, showrunner Steven Moffat jokingly answered one fan's question on what colour the Doctor's kidneys now were (he had complained he hated their colour) as "Froon. This is an entirely new colour, which only the Doctor can see."
 * His costume was revealed in DWM 470 and online earlier than planned to preempt a tabloid scoop.
 * He starred in The Daft Dimension, a comic strip published in Doctor Who Magazine.
 * Peter Capaldi wanted to wear his wedding ring as part of his Doctor's attire, and requested a prop to disguise it. He was given an amber ring with a gemstone that fits over the top of his original band. The First Doctor also wore a gemstone ring, and as such the Twelfth Doctor is the first incarnation since then seen to sport one. He is also the first incarnation since the Third Doctor to wear an ordinary ring.
 * Promotional material for Doctor Who Experience mentions that the green amber stone on the Twelfth Doctor's ring was 'allegedly' collected on the planet Raxacoricofallapatorius. However, this has yet to be stated in the narrative.

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