First Doctor

The First Doctor is the first incarnation of the Doctor to appear in Doctor Who and the main protagonist of the series from Seasons 1 to 3 and the overarching protagonist in Season 4, in which he regenerated into the Second Doctor. He returns as a minor character in the 10th Anniversary Special, The Three Doctors and a major character in the 20th Anniversary Special, The Five Doctors.
He was portrayed by the late in Seasons 1-4 and in his reappearance in "The Three Doctors." In his reappearance in "The Five Doctors," he was portrayed by the late . In his reappearance in "Twice Upon a Time", he was portrayed by . Bradley reprised the role on audio in Big Finish's First Doctor Adventures range, along with Stephen Noonan. 
==Biography==
The First Doctor originally grew up on the planet Gallifrey, home of the Time Lords. At university he was colleagues with the Time Lords who would go on to take up the names of "the Master" and "the Rani."
Eventually, growing discontent with the stagnant society of the Time Lords, the Doctor and his granddaughter stole a TARDIS to use to travel the universe. The two eventually wound up on Earth, where they took up the aliases of "the Doctor" and "Susan Foreman" respectively. Susan pleaded with her grandfather to be able to attend school on Earth, to which the Doctor reluctantly allowed her to do so.
However, Susan's unusually high intelligence and strange behavior drew the concern of two of her teachers, Ian Chesterton and Barbara Wright, leading them to follow her home one night out of curiosity. This led to them discovering the TARDIS, much to the Doctor's chagrin. This set of a chain of events which saw the Doctor whisking them away to prehistoric times, where they encountered cavemen. While attempting to bring Ian and Barbara back to Earth, the Doctor encountered the planet Skaro and decided to take a detour to explore it instead. There, the Doctor encountered the Daleks, a race of xenophobic mutants in metal casings who sought to exterminate the other species on the planet, the peace-loving Thals. The Doctor and his companions wound up teaming up with the Thals against the Daleks and helped them to defeat them.
The Doctor would continue to explore space and time with his human companions, jumping between different periods in Earth's history and various alien worlds. Eventually, the Doctor made it to Earth in the 22nd century, where he discovered an invasion force of Daleks had invaded and occupied the planet, turning many humans into mindless Robomen who did whatever the Daleks ordered them to. Teaming up with the human resistance, the Doctor thwarted the Daleks' plan to convert Earth into a superweapon. The Doctor also saw that Susan had fallen in love, and rather than make her choose between him and David, locked the TARDIS doors, and bade an emotional farewell to her, promising to see her again someday. He, Ian and Barbara travelled alone for a while, with the Doctor feeling his granddaughter's absence, but after a confrontation with "Koquillion", in reality the murderer Bennet, the Doctor invited the orphaned Vicki aboard, his first "true" companion. He and Vicki shared a close friendship, with both bringing out a mischievous side from each other. The repeated defeats of the Daleks by the Doctor led to the Supreme Dalek identifying the Doctor as a threat and dispatching specialized "Pursuer-Daleks" after his TARDIS.
Eventually, the Doctor's adventures would take him to Mondas, the twin planet of Earth, where he encountered the Cybermen, who were plotting to invade Earth. By that point however, the Doctor's health was failing him and so, after the Cybermen were stopped, the First Doctor succumbed to his old age and regenerated into the Second Doctor.
==Personality==
Initially after his departure from Gallifrey, the Doctor was highly arrogant and selfish, looking down upon humanity. Although he sought to explore the universe, he sought to keep himself distant from the lifeforms he was observing and not get involved in their affairs. However, the Doctor's personality began to change as a result of his adventures, in particular his encounter with the Daleks on Skaro, which caused him to realize "the Doctor was not the Daleks". From then on, the name of "the Doctor" went from being a simple alias to a creed the Doctor strove to follow and the Doctor himself became a much more heroic character, always going out of his way to help whoever he could. He was somewhat more protective towards his friends, and began to show off a mischievous, tricksy side to him, who enjoyed outwitting the opposition. The Doctor grew a moral centre, becoming morally outraged when he saw great injustice being done. 
==Quotes==
==Trivia==
*As a result of his advancing age, late into his run William Hartnell had the tendency to go off-script and say random lines, which led to the writers incorporating it as a character quirk.
**His declining physical health also caused them to create the idea of regeneration.
*The First Doctor was the only incarnation to regenerate due to old age until the War Doctor. 
**The Eleventh Doctor was "reset" by being granted more regenerations; otherwise he would have died of old age/Daleks.
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