The Thirteenth Doctor




 * “Yes. I'm glad you asked that again. Bit of adrenaline, dash of outrage, and a hint of panic knitted my brain back together. I know exactly who I am. I'm the Doctor. Sorting out fair play throughout the universe. Now please, get off this planet while you still have a choice.“
 * —The Thirteenth Doctor being asked who she is by Tzim-Sha.

Dynamic, curious and endlessly caring, the Thirteenth Doctor was the result of her predecessor's last stand for kindness. This incarnationof the Doctor believed in hope and practised compassion, providing help to anyone who asked.

After being separated from her TARDIS during her post-regenerative trauma, the Doctor was assisted in her recovery by Graham and Grace O'Brien, Ryan Sinclair and Yasmin Khan. Following a battle with the Stenza she dubbed Tim Shaw, that resulted in Grace's death, the Doctor inadvertently brought Graham, Ryan and Yasmin with her in her search for the TARDIS.

After finding the TARDIS, the Doctor initially planned to take Graham, Ryan and Yaz back home, making several accidental trips along the way. After briefly returning to Sheffield, Graham, Ryan, and Yaz officially joined the Doctor in her travels; they shared a close, familial bond, calling themselves Team TARDIS.

Though at first she kept her past very much behind her, sharing almost nothing about herself even to her closest friends, the Doctor's history began to catch up with her when she met a new incarnation of the Master, and discovered that he had ravaged their home planet Gallifrey.

Before Regeneration
When encountering the "Vortex Butterfly", the Tenth Doctor was cryptically told that he would not be "limited" to "thirteen lives". When the Twelfth Doctor broke his toe, Clara Oswald suggested that he regenerate to heal the injury, but he berated the idea as a waste.

When threatened by Captain Lundvik, the Twelfth Doctor told her she would have to shoot him, Clara Oswald and Courtney Woods, but warned that she would "have to spend a lot of time shooting him because he would keep on regenerating." Clara, during a falling out with the Doctor, later threatened to "smack him so hard he would regenerate".

The Twelfth Doctor once gazed at a female mannequin positioned in the doors of the TARDIS as if he held knowledge of his next incarnation being female. While suffering from the common cold, the Twelfth Doctor, overreacting to the illness, considered the possibility of needing to regenerate.

When the Twelfth Doctor confronted Rassilon in Gallifrey's Drylands after escaping from his confession dial, Rassilon contemplated using his gauntlet to force the Doctor to regenerate as a method of torture, rhetorically wondering how many regenerations the Doctor had been granted, but was interrupted before he could attack the Doctor with the gauntlet.

After the Monk invasion, the Twelfth Doctor needed to know if his companion, Bill Potts, was under the control of the Monks, and deceived her into shooting him in a rage to see if she had succumbed to the mind control, secretly putting blanks in all the guns, and faking his regeneration to complete the illusion. He made it look like the process had started, but emerged as himself to show her that he had deceived her.

When making his case for entering the dimension of the Eaters of Light to prevent them breaking through a inter-dimensional temporal rift, the Twelfth Doctor noted that he would regenerate if the light-eating locusts killed him. After the Twelfth Doctor was captured by the Master and Missy on a Mondasian colony ship, they debated throwing him off a hospital roof to kill him, but decided against it when they realised their uncertainty on how many regenerations he had remaining, believing they "could [be] up and down the stairs all night."

A New Body
After the Twelfth Doctor was gravely wounded by the Cybermen on the Mondasian colony ship, the regenerative process began. However, tired of "being someone else", the Doctor delayed the change for two weeks, until an encounter with his first incarnation, Archibald Hamish Lethbridge-Stewart, and the Testimony caused the Doctor to concede that another regeneration wouldn't "kill anyone". After taking a final look at the universe and providing advice to his next incarnation, the Twelfth Doctor regenerated inside his TARDIS in an explosive fashion.

As they regenerated, the Doctor relived memories from each of their past lives while the Twelfth Doctor continued to give advice, recalling the magnificence of their TARDIS; their first human friends, Ian and Barbara, the strangeness of some of their adventures, their love for London and how the Third Doctor and Sarah Jane saved the city from the Dahensa; and for parts of Earth outside the UK, such as New York City. With the new incarnation becoming a certainty instead of a possibility, her actualised potential sent postcards to various friends, including V. M. McCrimmon and Grandfather Halfling in the City of the Saved, as a "hello to the world".

As she continued the recollections, the Doctor settled into a new body. She next remembered Gallifrey and the regeneration limit, how the Sixth Doctor saved the Triumvirs from the Haxeen; the Master, how things weren't always as they appeared, and the Last Great Time War. As the regeneration finished, the Doctor noticed that her clothes no longer fitted and felt "there was something different about this body". After the Twelfth Doctor's ring fell off her finger, the Doctor remembered how the Ninth Doctor had to relearn to be "the Doctor" after the Time War, how the Tenth Doctor helped Elizabeth Garrett Anderson become the first female doctor in England, River Song, and the Daleks.

Still hearing her predecessor in her head, the Doctor staggered to the console to examine her reflection, and saw her new face, a change she felt was "brilliant". Before she could do more than press a button on the control console, the TARDIS suddenly spiralled into chaos, with the Doctor being thrown out as the time rotor exploded from the damage caused by the explosive regeneration. As she fell towards 2018 Sheffield, the TARDIS vanished.

The Women Who Fell To Earth
Crashing through the ceiling of a train that was being besieged by an alien energy coil, the Doctor saved Karl Wright and Graham and Grace O'Brien from the creature by forcing it to retreat, and took charge of the situation when PC Yaz Khan showed up with Grace's grandson, Ryan Sinclair. It was here that the Doctor was made aware that she was now a woman when Yaz adressed her as "madam". While Karl opted to leave without getting involved, the Doctor asked Yaz, Ryan, Graham and Grace to assist her, as she was still feeling uneasy after her regeneration, to the point that she collapsed. Waking up in Graham and Grace's house, the Doctor found that she and her new friends had had DNA bombs implanted in them, but was able to remove them and use the bombs to track the coil creature. Tracing the creature's signal to a warehouse with a Stenza transport pod, the Doctor, having lost everything in her pockets when falling out of the TARDIS, made a new sonic screwdriverusing Stenza crystals and scrap metal, and then confronted the Stenza warrior, Tzim-Sha, who had arrived in Sheffield to hunt Karl as a rites of passage.

The Doctor and her friends were able to find Karl at a construction site, and the Doctor was able to trick Tzim-Sha into activating the DNA bombs that had been downloaded into him, and he was forced to retreat. Unfortunately, Grace was killed when she was thrown off a crane while trying to overload the coil creature. The Doctor went to Grace's funeral, where she comforted Ryan. After the funeral, she went to a charity store with Ryan and Yaz, and chose a new outfit. Needing to find her TARDIS, the Doctor rigged up Tzim-Sha's transport pod, and transported herself to where she traced the TARDIS, accidentally bringing Graham, Yaz and Ryan with her.

Winding up on a spaceship crash landing on the planet known only as Desolation, the Doctor and her companions accompanied a duo of space racers, Epzo and Angstrom, while they finished the Rally of the Twelve Galaxies. While on Desolation, the Doctor overlooked the ocean as she considered her uncertainty about her future, knowing only that it would be "amazing".

Managing to survive the SniperBots hidden throughout the ruins of the planet, the Doctor uncovered a sabotaged science experiment conducted by another alien race subjugated by the Stenza, who had forced them to create weapons that eventually poisoned the planet and reduced it to a barren wasteland. Cornered by their Remnants, who attempted to read her mind, the Doctor destroyed them by igniting the gas in the air. After the space racers left the planet, having decided to end the race with a draw, the TARDIS returned to the Doctor with a redecorated interior, and the Doctor made to return Graham, Yaz and Ryan to their home. However, the Doctor had some trouble piloting the TARDIS back to Sheffield due to the new controls, and made several accidental stops along the way.

Returning to Sheffield
After fourteen failed attempts to return to Sheffield, the TARDIS arrived in Montgomery on 30 November 1955, where the Doctor noticed an influx of artron energy in the area, and decided to investigate. After Ryan was assaulted due to his skin colour, the Doctor was spared from having to interfere when Rosa Parks stepped up to alleviate the situation. When scanning Rosa revealed that she had been exposed to artron energy, and with her starting the Montgomery Bus Boycott just a day away, the Doctor discovered that a mass murderer from the far future named Krasko was attempting to prevent Rosa from initiating the boycott in the hope that doing so would prevent equality between races, but he could not harm anyone due to a neural restrictor in his brain, forcing him to use a temporal displacement weapon instead. Engaging Krasko in a game of out doing each other, the Doctor, Yaz, Ryan and Graham were able to keep history on track, even realising that they were always part of the events, and ensure Rosa was arrested after refusing to follow James Blake's order to move seats for Graham to sit on the bus.

The Doctor eventually got the TARDIS to Sheffield, but decided to stick around for tea at Yaz's flat after she was invited. She met Yaz's father and sister, Hakim and Sonya, and went to retrieve an unclaimed package for Hakim with Ryan when Yaz left to pick up her mother, Najia. Going to the neighbour's flat, the Doctor and Ryan met Dr. Jade McIntyre, and found that the neighbour had been killed by a giant spider. When Graham arrived claiming to have found another giant spider in his house, the Doctor, Ryan and Graham were brought by Jade to her laboratory, where the Doctor found that a Robertson Luxury Hotels hotel was at the epicentre of the spider sightings. Arriving at the hotel to find Yaz and Najia being threatened by a massive spider with the hotel owner, Jack Robertson, the Doctor investigated underneath the hotel, and found that an old mine filled with waste disposed by Robertson's disposal company had caused a specimen from Jade's lab that was thought deceased to mutate.

The Doctor, Graham, Ryan and Yaz, working with Robertson, Najia and Jade, were able to trap the entire brood of spiders in Robertson's panic room, and Robertson killed the spider mother with a gun, much to the Doctor's outrage, as the spider was already dying due to being too large to support itself. Later that night, as the Doctor prepared to depart, Yaz, Ryan and Graham returned to the TARDIS, explaining that they had all chosen to continue travelling in the TARDIS; Graham wished to have something to do to help him cope with Grace's passing, Ryan wanted more excitement in his life, and Yaz yearned to see more of the universe. Though the Doctor tried to persuade them to reconsider due to her dangerous lifestyle, the trio accepted the risks, pulling the dematerialisation lever together to continue their journeys as Team TARDIS.

Early Day’s
The Doctor took her friends to a singing waterfall made of pink crystals, a unicorn sanctuary on a lost moon, the Big Bang and the upward tropics of Kinstarno for rain bathing. After Team TARDIS encountered the Death Eye Turtle Army, the Doctor found herself having to "profusely" apologise to Graham for taking a risk he disagreed with. They also visited the Great Kalisperon Bike-Off. The Doctor and her friends went to see Elizabeth II's coronation in 1953, where the Doctor photobombed the picture of the royal family on the balcony of Buckingham Palace. She then saw that Eva De Ville, who had been sent to assassinate her, was leaving the scene, but her attempt to interfere resulted in Queen Elizabeth being taken by De Ville by mistake. Tracking De Ville, the Doctor landed the TARDIS on the Phasmatodea Cartel representative who hired De Ville and was able to retrieve the Queen.

Hoping to stock up on spare parts for the TARDIS, the Doctor went to a junk galaxy to scavenge, where Graham accidentally set off a sonic mine that knocked Team TARDIS unconscious for four days. Fortunately, the Tsuranga medical ship had been nearby when the mine detonated, and they had been brought on board for treatment shortly after the blast. Upon regaining consciousness, the Doctor found out that the rescue craft was on a preprogramed route and could not take them back to the TARDIS until docking at Resus One. As the Doctor tried to find a way to get back to her TARDIS, a Pting managed to get aboard the ship, and began eating it. The Doctor stunned the Pting by making it eat a device that overloaded it with energy and ejected it into space.

Stopping to watch the Sentient Nebulae on Blecplam Two and a Half in 3912, the Doctor and her friends encountered a rip in time that the Doctor recognised as the same anomaly she had encountered before, in her tenth and twelfth incarnations. As a hand emerged from within the anomaly, the rip vanished as before, but the Doctor was able to track it down again to an unnamed planet, where they successfully saved the trapped man, Dr. Leon Perkins, before being imprisoned by the Grand Army of the Just. While imprisoned, Perkins explained that he had become stuck in a time-loop when he and his superior, Dr. Irene Schulz, activated the prototypes of their prototype vortex manipulators, only for his to malfunction.

Using her sonic screwdriver, the Doctor opened their containment cell and Team TARDIS escaped with Perkins. After a detour that saw them find a war room containing statues of a presumed deity called "The Judge" and what appeared to be war plans, the group finally made it back to the TARDIS safely, before Perkins attempted to hijack the ship at gunpoint, an attempt which was rendered pointless, as the TARDIS had neutralised his weapon. In an act of compassion, the Doctor quizzed Perkins over a pot of tea: he explained that he and Schulz had come into contact with an alien, whom they dubbed "the Hoarder", who forced them to steal treasures from across the universe using their time travel technology, as well as children to act as hostages. When the duo refused to bring him new hostages, Schulz was injected with a toxic substance as punishment.

Eventually reaching the Hoarder's resident planet, the Doctor, her friends and Perkins found Schulz, who further explained that she had Perkins suspended in the time loop in order to keep him from the Hoarder's grasp, until she could find an antidote for the toxin in her system, which she would have also used as an inoculation on Perkins. Bringing the ingredients Schulz had already gathered back to the TARDIS, the Doctor put together an antidote, curing Schulz. Returning to the Hoarder's lair, Perkins and Schulz proclaimed to the alien that they were done working for him, while Team TARDIS got to work finding and freeing the hostages, as well as tipping off the Time Agency to the hoarder's activities. Surrounded by Time Agents, the Hoarder tried to escape using Perkins' vortex manipulator, unaware that it was still faulty, resulting in him being frozen in a time loop. Team TARDIS parted ways with Perkins and Schulz, assured that they would work to get the children home and the treasures back to their rightful places. When Ryan and Graham suggested throwing a surprise birthday party for Yaz, the Doctor went to look for a cake, balloons, and birthday candles. She bought a Sontaran Frosted Boom Cake at a bakery on Sontar, obtained some Zeppelins for balloons from London during the Blitz, and took a candled Candelabra in Paris. When the party began, the cake exploded and covered Team TARDIS in pink chocolate, but Yaz was happy nonetheless.

At Yaz's urging, the Doctor took Team TARDIS to 1947 during the Partition of India, so Yaz could learn more about the life her grandmother, Umbreen, had had before she moved to Sheffield, as Umbreen refused to talk about that time of her life. Meeting Umbreen and her fiancé, Prem, who Yaz claimed not to be her grandfather and had no knowledge of, the Doctor discovered Thijarians, a species of known assassins, near the body of a deceased holy man and assumed they were responsible for his death. However, the Thijarians revealed that they no longer killed, having been absent during the destruction of their planet, instead taking the role of witnesses to watch over the dying as they could not do this for their own people, and also revealed that Prem was destined to die during the Partition. Knowing history had to play out, the Doctor officiated the marriage of Prem and Umbreen in the place of the holy man, before Prem was killed on the orders of his brother, Manish, for marrying a woman of a different religion.

While travelling in the Time Vortex, the TARDIS was boarded by a Kerb!am Man to deliver a fez the Doctor had ordered in a previous incarnation. On the packing slip, Yaz found a message begging for help. The Doctor took the team to Kerb!am to find the source of the distress call and they began investigating the mysterious disappearances of workers. The Doctor eventually determined that the Kerb!am AI itself had sent the distress call in response to the disappearance of the employees. Shortly after making this revelation, Ryan deduced that Charlie Duffy, a maintenance worker, was behind the disappearances, and Charlie revealed his plan to have an army of Kerb!am Men deliver packages with bombs in the bubble wrap to kill Kerb!am customers and prevent automation from completely replacing a human workforce. The Doctor was able to reprogram the robots to open their own packages and detonate the explosives within, destroying the army and killing Charlie when he refused to escape with the Doctor.

On a whistle-stop tour of the Seven Wonders of the Universe, Team TARDIS arrived in the Jewelled City of Glude to find it a burning wreck, before witnessing the destruction of the Twelve Moons of Dhost by missile. The Doctor tracked the source of the destruction back to a film director in Follyrood, who had filmed the destruction for use in a movie starring Errol Flynn. The Doctor unleashed a box of data bugs, who lived on Dhost, that destroyed the director's film equipment and put an end to his destruction spree, and his career.

Attempting to see the coronation of Elizabeth I, the TARDIS instead brought Team TARDIS to Bilehurst Cragg in the 17th century, where the Doctor interfered in a witch trial, though she failed to save the accused, Mother Twiston, from drowning. Disgusted at the callousness of the landowner, Becka Savage, the Doctor tried getting her to see that there was no supernatural evil in her village, but the arrival of King James I hampered her attempts, especially when he dismissed her as a woman. Deciding to investigate elsewhere with Yaz while Ryan and Graham remained with King James, the Doctor visited Twiston's granddaughter, Willa, and learned of the unexpected depletion of the local fauna. The Doctor, Yaz and Willa investigated Old Mother Twiston's grave and saw her rise as a Morax. As Graham and Ryan arrived with King James and Becka in tow, the Doctor instructed Graham, Yaz and Ryan to follow the Morax as she questioned Becka. However, when she realised that Becka knew more than she was letting on, Becka accused the Doctor of being a witch, and King James ordered her drowned.

As she prepared to face a witch trial, the Doctor discovered that Becka was infected by the Morax Queen when she chopped down the lock keeping the Morax DNA imprisoned, thinking it was only a tree. Escaping her bonds after being submerged, the Doctor exposed Becka just before the Morax Queen took control of her and kidnapped King James, planning to turn him into a vessel for the Morax King. However, the Doctor was able to reactivate the prison to suck the Morax back in. Unfortunately, as the queen resisted, King James burned her with a torch, causing her to dissolve. Disgusted with the king, the Doctor refused to speak to him until she departed, with King James promising the end the witch trials and have the events in Bilehurst Cragg be stricken from the history books. Team TARDIS next arrived at a pizza parlour in New Port City, where they discovered the body of Iz. The Doctor and Graham investigated Iz's local Grey Zone Mall, but found that the posh dress she was wearing wasn't sold there. The Doctor attempted to find the teleportation coordinates to the Black Zone Mall above, but instead, Graham and the Doctor found themselves outside the city next to the teleportation system's core. Needing to bypass the core's teleportation block, they returned to the pizza parlour and used spray cheese to provide a forcefield while Graham drove a moped to the core. The Doctor and Graham rescued Ryan and Yaz from having their sperantium harvested, as the city's dictatorial mayor Ronan Sumners was accidentally ported into a Pizza-Porter oven.

The Doctor and her companions travelled to the planet Gatan, arriving in the City of Radiant Stone in the midst of war. As the group split up to help a lost girl called Tondi find her mother, the Doctor and Yaz were attacked by a looter called Gorny when the Doctor asked him for directions. The Doctor was able to subdue him, but they quickly got caught in the crossfire between two enemy warriors named Tumat and Kraytos. The Doctor learned from Gorny that the two of them had been fighting for months, causing the destruction of the entire city, but upon attempting to confront them, she was grabbed by a robotic reporter named Sandola Dell and teleported to her boss, Berakka Dogbolter. Berakka revealed the history of the warriors to the Doctor and how she was using enterprise to profit off of their fighting and attempted to kill the Doctor to protect her plans, before being interrupted by Graham and Ryan. Returning to Gatan, the Doctor helped lure Tumat and Kraytos into a teleport pad and forced them to re-emerge in the same place as one combined being. With the new Chimera stopping the war, the Doctor shut down Berakka's network and bade farewell to the Chimera.

After halting a war on the planet Lobos between the Loba and the human colonists, the Doctor and her companions departed in the TARDIS. When they attempted to return to retrieve Ryan's mobile phone, the TARDIS slipped almost six-hundred-years into the future, where the planet was now ruled by human zealots, served by slave Loba, whose religion was largely based on a misinterpreted joke made by Graham, who was worshipped by them as "the Good Doctor". First relegated to the background and having to do things through Graham's authority, the Doctor came into conflict with the ruling Temple of Tordos, and had to fight an artificially enhanced Loba Tromos to the death. In the end, the Doctor succeeded in uncovering the lie of the zealots, setting the record straight and brokering a lasting peace between humans and Loba.

The Doctor and her friends visited Adamantine, where the entire civilisation lived inside the hollowed shell underneath the planet's exterior, and befriended Ash, one of the native silicon-based life forms, and the daughter of the planet's first scientist, Basalt. The Doctor soon determined that the civilisation was under threat as the exterior of the planet began to crack and let in water which threatened to cool the lava that Basalt's people needed to survive. While Graham and Yaz tried to calm the people, the Doctor and Ryan travelled up to the surface with Ash, learning that the cracks were caused by a mining expedition that had been abandoned after the original team was killed by an exploding gas pocket while leaving their equipment running. The Doctor was able to contact the original company and obtain the necessary command codes to shut down the equipment and use it to repair the worst of the damage threatening Basalt's home city.

After the TARDIS passed through an energy anomaly, it landed in 451 AD Gaul, where Graham and Ryan were separated from the others during an attack, and the Doctor and Yaz were "captured" by Attila the Hun to serve as his new "combat witches" against the power of the mysterious Tenctrama. The Doctor eventually determined that the Tencrama were survivors of a catastrophe on a distant planet who now sought to gain power from the psychic energies generated by the deaths in the wars they were escalating on Earth. The Doctor realised that the Tenctrama's process depended on them having spent the last thousand years subtly "engineering" humanity to be suitable energy sources for them, with the result that the Tenctrama would be contaminated if they absorbed anyone who had been treated with healing technology, such as a healing gel the Doctor had used. The Tenctrama were caught by surprise when they absorbed a horse that the Doctor had healed, the disruption giving the Doctor time to reconfigure their equipment and project the Tenctrama energy into Earth.

When the TARDIS landed in 2018 Norway, Team TARDIS found Hanne, a blind girl left to fend for herself in a boarded-up house with a monster seemingly hiding in the woods outside. While trying to help Hanne find the monster, the Doctor discovered a mirror leading to another plane of existence, and ventured through it with Yaz and Graham, where they found Hanne's father, Erik, living with his supposedly deceased wife, and what appeared to be Grace. Evaluating the facts with Yaz, the Doctor realised that her grandmother's old bedtime stories about the Solitract were real and that she had discovered the living universe.

Thinking she had walked Graham into a trap, the Doctor tried to convince him and Erik to leave, but both men refused to lose their wives again, though Graham was convinced of Grace being a fake when she reacted with indifference to Ryan's safety. With everyone but Erik evacuated, the Doctor convinced the Solitract into forcibly releasing him by offering herself in his place. Now alone with the Doctor, the Solitract explained that it was not being malicious, but was lonely and only wanted company. The Doctor convinced the Solitract that its existence was threatened by objects foreign to its universe, including her, and it reluctantly let her go.

When the TARDIS picked up nine separate distress signals from planet Ranskoor Av Kolos in 5425, the Doctor took interest in the fact that everyone kept ignoring them and took Team TARDIS to investigate. Finding Greston Paltraki alone in his ship with memory problems and a strange package, the Doctor helped restore his memory, and he remembered that he was on a rescue mission just as Tzim-Sha contacted him, demanding Paltraki give back what he stole in return for his crew's safety. The Doctor had Paltraki led her and her companions to Tzim-Sha's base for a prisoner exchange and Graham told her that he planned on murdering Tzim-Sha to avenge Grace, with the Doctor threatening to expel him from the TARDIS if he did, though he still planned to do it.

Arriving at Tzim-Sha's "edifice", the Doctor took the package directly to Tzim-Sha and learned that, after the DNA bombs caused his teleporter to malfunction and strand him on Ranskoor Av Kolos, he had fooled the Ux, a rare species capable of dimensional engineering through pure thought, into seeing him as their god. He convinced them to use their powers to heal him from his near-death and create a weapon that could miniaturise planets, killing the inhabitants in the process, so that Tzim-Sha could take revenge on worlds that had opposed the Stenza. However, the Doctor, with help from Yaz, was able to get the Ux to see their mistake and return the planets to their original places. With the planets' return stabilising the universe, the Doctor found that Graham and Ryan had trapped Tzim-Sha inside one of his own trophy cases as punishment, with the Ux sealing the edifice to ensure no-one would be able to free him.

Resolution
Attempting to reach the Ninth Moon of Quezzeltrax, the TARDIS instead landed in 1601 Bohemia, where the Doctor, Graham, Ryan and Yaz joined Tycho Brahe and Johannes Kepler at a gathering of scientists laid out by Baroness Dagmar Ruskovitch, a meeting the Doctor could not remember from historical accounts. At the gathering, she and Ryan discovered a ritual and were psychically attacked by a monk named Dominik. However, the Doctor was able to turn the attack back on him, knocking him out and giving her and Ryan time to investigate. When doing so, the Doctor was attacked by energy and left paralysed and continually muttering nonsense. Ryan, carrying her, was later cornered by two robed figures from Dominik's Brethren, just as the Doctor came around and fended them off.

Regrouping with the rest of her friends, the Doctor learnt that Ruskovitch was trying to prevent the summoning of a twisted figure in the castle's cavern, despite the Doctor believing her to be the cause, just as it fully manifested in the form of the Doctor herself. With Ruskovitch revealing herself and Dominik to be Knights of the Solitary Sword, who were dedicated to protecting the universe from the Catastrophia, the Doctor and Ruskovitch teamed up to seal its herald away again, at the cost of Brahe's life.

After enjoying nineteen New Year's celebrations, Team TARDIS was alerted to strange signals coming from Sheffield, and met Mitch and Lin at an archaeological site in the sewers, where the Doctor obtained DNA from slime on the wall. Deciding to go to Graham's house, Team TARDIS found Ryan's absent father, Aaron, had arrived to reconnect with his son. After Ryan left to hear his dad out, the DNA analysis in the TARDIS completed, and the Doctor found that it belonged to a Dalek. Tracking down Mitch, the Doctor learned that the Dalek had been buried on Earth since the 9th century and that it was controlling Lin. Resolving to stop the Dalek after Ryan returned, and accidentally leaving Graham behind with Aaron, the Doctor, Yaz, Ryan, and Mitch tracked Lin to a warehouse, where the Dalek had constructed a new casing from scrap.

Revealing her identity to the Dalek, the Doctor demanded the Dalek leave the planet while it had the chance, but it refused. Collecting Graham and Aaron, the Doctor tracked the Dalek to the Government Communications Headquarters, where she and her team melted the Dalek's casing with Aaron's microwave oven. The victory was short-lived when the Kaled mutant inside took control of Aaron's body, forcing the Doctor to take it back to Skaro. However, the Doctor opened the TARDIS doors into a supernova, removing it from Aaron.

Arriving in Guelder in the early 16th century, the Doctor was stunned when her companions revealed the knowledge they had gained of the Guelders Wars from a historical podcast hosted by Bethany Brunwine called Hidden Human History. Exploring, Team TARDIS encountered a horde of Stilean flesh eaters, an alien species that were able to gradually take on the traits of different lifeforms after consuming their blood, one of which took a bite out of the Doctor. Tracking the Stilean flesh eaters to North Carolina in 1711 during Cary's rebellion, and to Canada in the 1860s during the Battle of Ridgeway, the Doctor noticed that the creatures were gradually becoming more human the more they fed, just as Dr. Leon Perkins and Dr. Irene Schulz arrived, both having joined the Time Agency since their last encounter with the Doctor.

As they continued to track the creatures, the crew became aware that they were continually visiting times and places that had been covered in Hidden Human History. To learn how the podcast was connected to their recent travels, Team TARDIS paid a visit to Bethany Brunwine at her home in 2019London, where they discovered that she was the Stilean flesh eater that had bitten the Doctor upon their first encounter. Bethany revealed that consuming the Doctor's blood had slowed her ageing, allowing her to live on Earth among humans for centuries, and that the podcast had been inspired by her encounters with the Doctor in the past. After ending their visit with Bethany, Yaz questioned if the Doctor would give Hidden Human History a listen, to which the Doctor agreed, believing it would be rude not to, considering "[she] helped it happen".

Reminders of the Past
Along with her companions, the Doctor was asked by MI6to investigate a series of attacks on all spies across Earth. Contacting her old friend "O", the Doctor and her companions learned that the attacks were linked to VORCEO Daniel Barton and aliens called the Kasaavin. During the confrontation, "O" revealed that he was actually the Master and was behind the attacks. Following this, she was separated from her companions by the Kasaavin, who transported her to their realm.

Investigating the area, the Doctor encountered Ada Lovelace, who seemed to naturally be able to enter the dimension. Arriving in 1834 London, she learned that the Master was following her and that his plan covered various time periods. Travelling to Paris 1943 with Ada, they encountered Noor Inayat Khan. Confronting the Master at the top of the Eiffel Tower, the Doctor learned that the entire plan was to get her attention. She learned that Gallifrey had been destroyed and he wanted her to return. Leaving the Master to be arrested by Nazis, the Doctor stole his TARDIS and, with help from Ada and Noor, foiled the Kasaavin's plan, and allowing them to take the Master back to their realm with them.

After returning Ada and Noor to their original time periods, the Doctor returned to Gallifrey, only to learn it had been ravaged and left in flaming ruins. In a hologram message left by the Master, she learned that he was behind this, having learned about the Timeless Child and that Time Lord history was built on a lie. After this revelation, the Doctor opened up about her past to Graham, Ryan and Yaz. (She would occasionally return to her destroyed home planet, while also trying to find evidence of the Master escaping the Kasaavin.

After the Doctor accidentally interrupted the mating season of the Deep-Space Squids, Graham revealed he had been collecting coupons for a free holiday, which Team TARDIS was immediately transported to. Arriving at Tranquility Spa, the Doctor decided to explore the area while her friends enjoyed themselves, eventually ending up investigating strange happenings around the spa which the staff had withheld after extracting a hopper virus from Ryan. She soon discovered that the spa had been a "Fakation" built on an orphan planet. Motivated by Vilma, an old lady who had lost her friend Benni to the Dregs in an attack on Tranquility Spa, the Doctor insisted on her, Team TARDIS and the staff travelling outside to rescue Benni. While travelling the wastelands, she and the team soon found out that Orphan 55 was Earth in the future and the Dregs were mutated human survivors. Escaping back to the spa, she and the team tried to fight off the Dregs, but, ultimately, Team TARDIS had to escape by teleporting back in the TARDIS. Back in the TARDIS, the Doctor reminded her friends that the future they just witnessed was only a possibility and there was still time to change it.

Tracing strange signals to the early 1900s, the Doctor found Nikola Tesla and his assistant, Dorothy Skerrit, being pursued by strange phantom-like beings trying to capture Tesla. Having arrived in New York in the middle of a feud between Tesla and Thomas Edison, the Doctor investigated Tesla's pursuers and found them to alien scorpions known as the Skithra, who required Tesla to repair their stolen Venusian spaceship. Working with Tesla and Edison, the Doctor and her team fought the Skithra when they threatened to destroy Earth to get to Tesla, with the Doctor and Tesla using the TARDIS to electrify Wardenclyffe to force the Skithra into a retreat.

While undertaking another search for the Master, the Doctor was interrupted by a signal telling her that the Judoon were placing a zonal enforcement field in Gloucester. Team TARDIS slipped through the enforcement field to a coffee shop, which they left to search for the Judoon, as Graham was teleported away. Find the Judoon wielding a temporal isolator at an apartment, the Doctor posed as an Imperial Regulator and discovered that they were hunting a fugitive. Allowed time to peacefully dissolve the situation, the Doctor, Ryan and Yaz entered the home of Lee and Ruth Clayton, finding that although they were both completely human, Lee was hiding something alien. After being told by Lee to take Ruth away while he confronted the Judoon, the Doctor and Ruth quickly hid in the Gloucester Cathedral, while Yaz and Ryan stayed to manage the Judoon.

When the Judoon found them in the Cathedral, and confirmed Lee had been executed, Ruth displayed previously unknown fighting skills without knowing what she was doing to repel the Judoon, prompting the Doctor to take Ruth to the abandoned lighthouse where Ruth claimed to have grown up. At the lighthouse, the Doctor found a TARDIS in the shape of a police box buried by a gravestone with no names on, just as Ruth regained her memories from a Chameleon Arch and revealed herself as another incarnation of the Doctor, and teleported her and the Thirteenth Doctor inside her TARDIS. As they began squabbling in confusion on not remembering the other, the two Doctors were caught in a tractor beam and brought to the Judoon rocket, where they found the Judoon working for a Gallifreyan named Gat, whose nature convinced the Thirteenth Doctor that both Gat and Ruth were from her past, despite not remembering either of them. After Gat was killed by a tampered gun, the two Doctors fled the Judoon in the TARDIS, and the Thirteenth Doctor was dropped off back in Gloucester, where she was found by Yaz and Ryan, who told her that they had met Captain Jack Harkness. Back in the TARDIS, Graham relayed Jack's message to the Doctor; "Beware the Lone Cyberman. Do not let it have what it wants." The TARDIS alarms then sounded, notifying her of alerts from three different locations, and Team TARDIS took off to investigate.

Dropping off Ryan in Peru and Yaz and Graham in Hong Kong, the Doctor herself travelled to a beachin Madagascar, where she found a naval officer in danger. With help from the nearby Suki Cheng and Aramu, the Doctor dragged the man out of the water, but he then exploded into dust after scales emerged all over his body. After being called to a hospital in San Pedro by Ryan, she found a young girl with the same symptoms had also exploded into nothing. She took both Ryan and the girl's friend, Gabriela Camara, aboard the TARDIS and left to meet Graham and Yaz, who had gained the company of Jake Willis and his sick husband, astronaut Adam Lang, all of whom have recently been under attack from men in hazmat suits with alien guns. She took them all aboard the TARDIS, except for Yaz and Gabriela, who insisted on staying to do some research, and ventured back to Madagascar where Aramu told them about strange bird behaviour. They used Suki's lab to do some tests and discovered that the Adam had been infected with an alien pathogen.

While working on an antidote, the Doctor then got a comm dot call from Yaz that made her realise that Suki was behind it all. As Suki teleported away, the birds came crashing through the window, necessitating the team to flee to the TARDIS. Inside the TARDIS, the Doctor administered the antidote on Adam and set up the TARDIS to synthesise it. She tracked Yaz's location to a gyre at the bottom of the Indian Ocean, where they then found Suki, who explained about Praxeus before succumbing to the pathogen herself. The Doctor received the finished antidote from Jake and Adam and set Suki's ship to take off and disperse the antidote into the atmosphere. After hurrying back to the TARDIS, the Doctor discovered that Jake had not followed them. Getting a visual feed from him inside Suki's ship, she guided him through releasing the antidote and then rescued him just before the ship exploded. She then dropped Jake, Adam and Gabriela off in Madagascar.

The Lone Cybermen
After dropping Team TARDIS back in Sheffield to spend some time with their friends and family, the Doctor prepared to travel ahead to their return, but was stopped by an alarm from 1380 Aleppo. Following the alert to a Bimaristan, the Doctor found a young woman named Tahira hiding from a monkey-like beast called a Chagaska. While heading back to the TARDIS with Tahira, the Doctor got multiple calls from her companions, each complaining about strange events in Sheffield. Picking up her friends with Tahira in tow, the Doctor hooked Graham to the telepathic circuit so the TARDIS could follow his strange visions, which saw Team TARDIS and Tahira travelling to a space platform in the far future. Finding a geo orb stuck between two planets in an everlasting extinction event, Graham told her that this was his vision, and that there was a woman trapped in the orb.

After Tahira and her companions disappeared exploring the ship, the Doctor was confronted by Zellin, who revealed that he had set the trap for her to unlock his long-imprisoned partner, Rakaya, from the geo orb. When Rakaya was released, she sent the Doctor into a dream state, in which she explained the events which had led to her imprisonment. The Doctor awoke to find herself hand-cuffed, but soon freed herself, her companions and the other prisoners. The Doctor then lured the two immortals to Aleppo and trapped them both inside the geo orb with the Chagaska after Tahira conquered her fears of it and tamed the Chagaska. Back in the TARDIS, after she had returned Zellin's prisoners back to where they belonged, Graham confided in the Doctor about his fears of his cancer, but she had no idea what to tell him, and decided, as a distraction, to take Team TARDIS to see the creation of Frankenstein.

Going to Lake Geneva in Switzerland 1816, the Doctor and gang landed in the middle of a rainy and stormy night. Soaking wet, they sought refuge in Villa Diodati and were greeted by Mary Shelley, Claire Clairmont, John Polidori and Lord Byron. Once indoors and dry, they were led back to the party by Fletcher, the butler, and were taught a dancing routine by their hosts. However, the Doctor was picking up bad "vibes" from the house, and the occupants soon found themselves trapped in various areas of the house, plagued by apparitions.

The Doctor worked out that there was a perception filter around the house, but found that they were still trapped inside. They found a being trying to manifest itself in the time period which was eventually revealed as the Lone Cyberman, looking for "the Guardian", causing Team TARDIS to remember Jack's warning. After finding Percy Shelley hiding in the cellar, the Doctor figured out that he was the Guardian, as he had found Cyberium which had then been absorbed into his body. Despite disagreement from Ryan, the Doctor took the Cyberium from Percy and gave it to the Cyberman, who then vanished. Team TARDIS said their goodbyes and left for the far future in the TARDIS in order to clean up the "mess" the Doctor had caused.

Personality
Influenced by the final words of the Twelfth Doctor, the Thirteenth Doctor was a kind-hearted individual, never refusing anyone help if they needed it, and willing to take great risks in protecting innocent lives. She was also highly secretive, failing to tell her companions about her past until pressed into doing so, and sometimes leaving them behind to deal with secret affairs. However, she would be upfront with her feelings when letting people know when she was afraid or no longer feeling a certain way.

She would keep her discoveries hidden from others with the mind-set of protecting them from a harmful realisation, and was not above being cryptic, handing Missy an annotated map of 14th century Venice without explaining it, and leaving Missy to discover for herself what the annotations meant, while also not divulging her true identity to Missy.

The Thirteenth Doctor was a chatty individual, frequently rambling to distract herself or others from her worries. However, when facing an adversary by herself, the Doctor would appear as a confident and direct speaker, even acting in a passive aggressive manner to antagonising them into exposing their shortcomings. She once admitted she could talk to herself without fear of isolation, believing that another person in a conversation would just "get in the way".

Due to being "socially awkward", the Doctor could be blunt with those she spoke with, openly pointing out the ineffectiveness of others aid, being clear with her feelings towards someone for their past actions, and calling Nikola Tesla a "big fat liar" after he tried to deceive her. When Graham opened up to her about his fears of his cancer returning, the Doctor openly stated her uncertainty on how to respond, instead electing to narrate her movements and admit she would later think of something she should of said to him.

A self-proclaimed "nutter", the Thirteenth Doctor possessed a ruthless side to her, such as leaving the Master to the mercy of the Nazis when stealing his TARDIS, even deactivating his perception filter to expose his non-Aryan appearance to them. She also talked down to the Queen of the Skithra as a parasite who was only queen of "shreds and patches", and then threatened her legacy as being forgotten after she was "too stupid" to take "a chance to evolve".

She also had a bit of an ego, stating her plans would be a success due to her "not [being] an amateur", (TV: The Woman Who Fell to Earth) boasting about her intelligence, and describing her chapter in the Book of the Celebrants as being "more of a volume". She claimed to have an understanding of "pretty much everything", and delighted in one Dalek's reaction to hearing her name.

She also disliked not being in charge, still assuming to know better when someone else was better equipped to take charge in the situation at hand. Even while trying to act incognito, the Doctor had no patience for others' claims of authority, and was especially protective of others who suffered under such leadership. Nevertheless, she saw fault not in the systems themselves, but in the actions of those individuals who sought to abuse them.

She retained the absent-mindedness of her previous incarnation, tending to forget how many times she did something, forgetting whether she was awarding points or gold stars to her companions, and only remembering she was holding an item of interest after asking for its whereabouts in a state of a panic. She had a self-admitted tendency to confuse "meaning to say something" with "actually saying it", showing that she was oblivious to the ongoing need for effective communication with others, above mere intent. She could even fail to notice her companions' presence or absence, even when they had been missing for some time.

She also retained her predecessor's veneration of the dead. As a result, the Doctor held respect for all living beings even if they caused harm due to their nature, and sought to give a second chance even to the deadliest of her foes, but would other no second chances to those that truly irked her.

Upon seeing Gallifrey in ruin, the Doctor reacted with devastation. After discovering the Master was responsible for the act in retaliation for "the lie of the Timeless Child", the Doctor was left in a foul mood, that lasted for some time. Even after some time had passed, the Doctor was still sore on the subject of dead planets. She would occasionally revisit Gallifrey after it was ravaged by the Master.

The Doctor enjoyed biscuits, with custard creams being a particular favourite, and tea, with Yorkshire Tea being her preference. For breakfast, she liked to have cereal or croissants, and enjoyed fried egg sandwiches.

She also liked holograms, "big locked doors", the number 51, the musical Hamilton, apple bobbing, Wellington boots, "pretty" landscapes, running, and laminators. She retained her eleventh incarnation's fondness for fezzes.

The Doctor held a great admiration for those who crafted things for themselves and made their own inventions, praising both Ada Lovelace and Nikola Tesla for their ingenuity and forward thinking. Placing intrinsic value in the creation of novelty, she saw the lack of recognition each received as quite trivial, when compared with their accomplishments. She also admired Amelia Earhart for taking the world on and pushing it forward. In contrast, she admonished those who only took power and recognition through ownershipalone. She claimed that such people, who never created things themselves, were destined to be forgotten to history.

While she once claimed to "love a conspiracy", she disliked ones that resulted in information being purposely withheld from her. She also heavily disliked having empty pockets, as well as olives, bullies, and people in danger. She also did not enjoy physical contact with others, reacting awkwardly when hugging Najia Khan.

The Thirteenth Doctor stated that love was central to her "faith", believing it to be the better source of belief. She was also a strong believer in hope, and once voiced the opinion that "where there [was] risk, there [was] hope."

Like her early incarnations, the Thirteenth Doctor was not interested in romance, but retained a respect for it, even describing herself as a "romantic", though she disliked being flirted with. She stood against racism and prejudice, and showed her disgust with gentle comments of acceptance.

The Doctor claimed that she enjoyed making "trip[s] into the past" for research purposes, but knew to be cautious when making such trips, even writing a note to chastise Missy for her lack of caution in that regard. She took her devotion to the preservation of history so seriously that she described herself and her companions as its "guardians". Despite her usual unwillingness to tamper with time, the Doctor found herself willing take her companions to visit their own family history, with some persuasion, though warned her friend to "tread softly" on their own history. At some times, the Doctor's sense of justice got the better of her, making her intervene in past events if she believed them to be minuscule enough to not impact history in too great a detail. She would still show signs of distress if preserving history meant letting injustices stand and go unpunished.

Similar to the Tenth Doctor, the Thirteenth Doctor disliked weaponry, opting instead to use her intellect and environment to her advantage, even voicing her disapproval when someone resorted to using a weapon, though she admitted this was a "flexible creed", as anything that could be rebuilt was "fair game" to be destroyed. Specifically, the Doctor believed guns "made things worse", as they only agitated attackers, and that only "idiots" carried knives. Nevertheless, even after Leon Perkins threatened her with a gun, the Doctor favoured serving him tea over imprisoning him, hoping to come to a common understanding with him.

Furthermore, the Thirteenth Doctor was passionately against murder, always trying her best to subdue her opponents in a non-lethal fashion. She also expressed distaste for the act even when committed by her allies, and was deeply disturbed when she was forced to indirectly be responsible for the loss of life, seeking confirmation from her friends that she had given every opportunity for a better outcome when she resorted to killing her foes.

She implored those around her to ask questions about a situation, and showed no irritation on how off topic the questions got, even showing excitement when the right questions were asked, but would clarify when "the wrong question" to a situation was being posed. However, she showed displeasure in handling multiple questions simultaneously, and would refuse to answer questions asked of her if the person did not answer any questions she asked first. She also excused her solo trips to the destroyed Gallifrey by claiming that Team TARDIS "ask[ed] too many questions" about her private affairs.

Much like her eleventh incarnation, the Thirteenth Doctor would run into a situation without a strategy in mind, hoping to come up with a plan in the heat of the moment, claiming to be "good in a tight spot" and to enjoy throwing a "curveball" into the situation, but would take precautions when she knew how dangerous a situation was. She was confident she could take on any threat.

Claiming to have "never been a fan of growing up", the Doctor used humour to defuse tension, demonstrating a playful sense of humour. She labelled the Moment's interface "a Christmas cracker", and responded to Cass Fermazzi's mention of having needed childhood therapy with a dry "didn't we all".

She retained the guilt demonstrated in her prior incarnations over the events of the Last Great Time War. Visiting Cass prior to her death, the Doctor expressed her regret over Cass' fate and noted that saving Cass was impossible as "[Cass] was too wrapped up in [her] timeline", demonstrating her continued respect for the Laws of Time. Like her immediate predecessor, she believed that "no one ever wins at war".

She was particularly displeased to be reminded of being an outcast, and tried to hide her fear of loneliness with the company she kept, becoming upset at the prospect of bidding her companions a farewell, even skipping ahead to their next rendezvous times when Team TARDIS took their breaks from the TARDIS. She considered her friends to be an extended family, and emphasised with Nikola Tesla for feeling "out of place" amongst other people.

Series 10

 * Twice Upon a Time

Series 11

 * The Woman Who Fell to Earth
 * The Ghost Monument
 * Rosa
 * Arachnids in the UK
 * The Tsuranga Conundrum
 * Demons of the Punjab
 * Kerblam!
 * The Witchfinders
 * It Takes You Away
 * The Battle of Ranskoor Av Kolos
 * Resolution

Series 12

 * Spyfall Part 1
 * Spyfall Part 2
 * Orphan 55
 * Nikola Tesla's Night of Terror
 * Fugitive of the Judoon
 * Praxeus
 * Can You Hear Me?
 * The Haunting of Villa Diodati
 * Ascension of the Cybermen
 * The Timeless Children