The Doctor

The Doctor is a Time Lord from the planet Gallifrey. This means that each Doctor possesses the ability to regenerate, allowing them to change their appearance, personality and sometimes even skill. So far 8/14 of the canon (Treating the Timeless Child as non-canon) Doctors have been made by Cody alone

The stowaway
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Finding the Death Note
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Meeting a version of Leek
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Confronting Tricky
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Entering the Abyss
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A conversation with Dracula
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Multiversal Adventures before the merge
Before the multiverse merge the Eleventh Doctor encountered a series of rifts that brought his TARDIS into the Marvel universe. With the help of Captain America, two jedi knights in the same position as him and Greg Lestrade, 11 was able to create a device that allowed the TARDIS crew to travel the multiverse using rifts in reality. Together, the crew travelled across the multiple universes, most notably travelling to WWII and accidentally altering history in that universe

After the merge
Sometime after the merge 11 utilized the same technology to safely traverse the multiverse in his TARDIS. His travels first brought him to the realm of a certain "God King." He then rescued a group of humans from The Huntress, including Steve Harrington, Robin Buckley and Cambri. The Doctor then briefly made an appearance while the Avengers were recruiting, just to say hello to his old friend Captain America. At some point during this time the Doctor travelled to Buckstars to stop a Dalek invasion.

Becoming the keeper of the Time Stone
Sometime later the Doctor met Captain America at a cafe to catch up. The two felt a rumble from a few blocks away and rushed to the scene, discovering the site of an Ultron attack. The two attempted to figure out what he was there for, but all they discovered were traces of the infinity stones.

After the defeat of Ultron, The Doctor was contacted by Doctor Strange via his psychic paper. The Doctor quickly travelled to his sanctum, where the Sorcerer Supreme entrusted him with protecting the time stone. The Doctor gladly accepted and took the Time Stone back to his TARDIS, not quite understanding the weight of what he had just been given

Continued Travels
Knowing that the Time Stone would be safer stuck on his TARDIS, the Doctor restored the cloud he used while he was getting over the loss of his two recent companions. During his travels the Doctor headed to a diner in England to eat chips, encountering the Kamen Rider Tsukasa Kodoya. The two thwarted a Sontaran's attempt to assassinate them and the Doctor was given the sonic screwdriver used by his tenth incarnation

Exile
After the Doctor was framed by Knull and the Valeyard for destroying a significant portion of the multiverse, the Doctor entered a self-imposed exile in order to protect the Time Stone. This lead to him staying on his cloud in order to avoid the HSPD. During the Combine Invasion the Doctor met Captain America in the same cafe, using a perception filter to hide himself from the public. The two discussed the invasion until they Combine actually arrived and parted ways before the HPSD could track down his Artron Signature

Meeting Geralt
During Ragnarok the twelfth Doctor travelled to the Witcher Universe in order to investigate the multiversal snow. During his investigation the Doctor met Geralt of Rivia and after a mishap with Geralt's sign abilities and the TARDISes Hostile Action Displacement system, the two were thrown across the Multiverse. Unlike his other incarnations 12's TARDIS wasn't prepared for multiversal travel, so Geralt was stuck as his companion for the foreseeable future.

Travelling through the Multiverse
With his reluctant companion the Doctor and Geralt travelled the multiverse in the hopes of arriving in his universe again. At one point the Doctor landed in the Hubspace wilderness and argued with Geralt about equipment he had given him to make sure the two didn't get separated. At another point, the Doctor and Geralt arrived in Victorian London from the Assassins Creed universe and helped Jacob Frye arrest Jack the Ripper

Trying to take Geralt home
Soon after, the Doctor and Geralt discovered a broken-down Quinjet in deep space, seemingly designed to travel the multiverse. The Doctor downloaded navigational data from the ship into his TARDIS and attempted to take Geralt home. Unfortunately, the TARDIS was caught in a dimensional anomaly that almost destroyed the ship and sent them to Tamriel. There they met Koyi, a twi'lek engineer. The Doctor and Geralt had a falling out and the Doctor, with Koyi's help, managed to restore the TARDIS's reserve power. Shortly after the gates of oblivion opened and the trio went on a mission to close them. Now with a fully functional TARDIS the Doctor travelled to Geralt's universe, finding it destroyed after Knull's attack. The two then travelled to Hubspace in search of answers...

A wanted man
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Meeting Omni-Man
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Confronting Rykar
After the attack on HSPD by the Eldergod Rykar, the Doctor arrived on their ship and discovered that two UNIT soldiers had been kidnapped by them. The Doctor threatened the Eldergod and took the UNIT soldiers home. She spent the following days trying to figure out what happened, only to be disappointed

Knull
The Doctor then tracked a distress signal to the planet Sorgan. Upon entering the town where the signal originated from the Doctor followed a strange child into one of the towns buildings and was captured by people corrupted by Knull. The elder god then attempted to corrupt the Doctor, accidentally creating the Valeyard, an dark version of herself encountered by the sixth Doctor centuries ago. The Valeyard took the Doctor's TARDIS and used it to destroy a chunk of the multiverse. The Doctor was then saved by a version of Luke Skywalker and the two escaped using a vortex manipulator

Hunting the Valeyard
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Abilities

 * Regeneration: Being a Time lord, the Doctor’s most well known ability is their regeneration. Regeneration allows the Doctor to completely heal any damage they have taken (Of course it has limits) at the cost of themself. The Doctor gains a completely new personality and appearance upon regeneration.
 * Beyond Genius Level Intellect: The Doctor has the vast intellect of the time lords, making them one of the smartest people in the universe. The Doctor has been able to outsmart gods, build machines capable of destroying Earth and a Dalek fleet within hours and even save his home planet, Gallifrey, from the time war. Although they are relatively average compared to the rest of his species, the Doctor’s creativity makes up for it.
 * Time Lord physiology: Time Lord physiology is very different from humans. The Doctor has an extremely long lifespan (Excluding regeneration, which can reset the aging process (Time of the Doctor, most classic regenerations)) The Doctor is also sensitive to time, making them immune to changes in a timeline
 * Respiration  Time Lords can survive in environments without oxygen for much longer, they can also enter a trance-like state to extend this time even further. They also possess a “respiratory bypass system” which allows them to survive strangulation, poisonous gasses and drowning
 * Body temperature Time Lords have a higher body temperature than humans allowing them to survive much easier in cold environments, to the point where the Doctor doesn’t need to wear protective gear in the poles
 * Circulatory system The most important difference in the Doctor’s main circulatory system is his blood’s “temporal platelets” which allowed for quick recovery from minor rooms without the use of regeneration energy
 * Binary Vascular system The Doctor has two hearts. They only need one to survive. Being a Time Lord they has complete control over them, allowing them to briefly fake their own death
 * Enhanced senses and superhuman reflexes: Self explanatory. Time Lords have better senses than humans
 * Time Manipulation resistance: Time Lords are immune to many forms of time manipulation, including slowing time down. They retain memories of negated and alternate timelines and can retain perception of local time flow
 * Minor Psychic abilities: Time Lords have minor psychic abilities that allow them to share memories with others, send messages to other Time Lords and recognize Time Lords by sight even through regeneration

Weaknesses

 * Human Weaknesses: Despite their heightened resilience the same methods used to kill humans (Excluding air related methods) can be used to kill the Doctor
 * Dedication to saving people: The Doctor’s dedication to saving lives can cause them to throw a life away and even give an enemy what they want (E.g. giving the cyberiad to the lone cyberman)
 * Regenerative flaws: The Regeneration process has flaws. If the Doctor receives a fatal blow during regeneration will kill them. Time lords also suffer from regeneration sickness, causing amnesia, confusion, erratic behavior or extended periods of unconsciousness. These effects can be negated by entering a TARDIS’s “zero room”

Fourth Doctor
This Doctor is rather eccentric, often cracking jokes and playing the fool even when facing the most dangerous of foes. Although mostly peace-loving and kind hearted, like many other incarnations he has an explosive fury with enough provocation. He WILL offer you a jelly baby

Seventh Doctor
This incarnation of the Doctor is considered a master manipulator, a trickster, who isn’t afraid to stand in front of a gun and simply talk someone out of shooting him, even encouraging them to. However, he is still kind, still without cruelty or cowardice especially to his companions

Eighth Doctor
This Doctor is… A bit of a romantic. He’s still kind and never cowardly, still hiding a darker side that can send chill down the spines of anyone. He never believes it’s too late to save someone and frequently reflects on the lives he has had to take.

The Eleventh Doctor
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The Twelfth Doctor
The Doctor is, most importantly, kind. He always puts others before him, no matter what. He is very sarcastic and at times matter-of-fact but very friendly to people he’s close to.

The Thirteenth Doctor
Influenced by the final words of their previous incarnation, 13 is never cruel or cowardly, always willing to help those in need. They’re more mechanically inclined than their previous incarnations and struggle more when making grand speeches or being an inspiration. When the Valeyard was created, the Doctor lost most of their negative traits like their tendency to lie and arrogance, making this the purest incarnation of the Doctor in MM

Geralt of Rivia
A companion of the Twelfth Doctor, Geralt is a reluctant member of the TARDIS team, only there because he cannot go home. The Doctor and Geralt don't get along and he only keeps him around because he feels obligated to

Tamaso
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