William Henry Hartnell (/ˈhɑːrtnəl/; 8 January 1908 – 23 April 1975) was an English actor, who is best known for portraying the first incarnation of the Doctor, in the long-running British science-fiction television series Doctor Who from 1963 to 1966; he reprised the role in 1972–1973. In film, Hartnell notably appeared in Brighton Rock (1949), The Mouse That Roared (1959) and This Sporting Life (1963). He was associated with military roles, playing Company Sergeant Major Percy Bullimore in the ITV sitcom The Army Game (1957, 1961) and Sergeant Grimshaw, the title character in the first Carry On film Carry On Sergeant (1958).
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In this Dossier
First Doctor in the context of List of actors who have played the Doctor
Fourteen actors have portrayed the Doctor in a leading role in the British science fiction television series Doctor Who. The series' protagonist, the Doctor is an alien from a species called Time Lords. The transition to each succeeding actor is explained within the narrative through the plot device of regeneration, which allows Time Lords a change of cellular structure when they near death, changing their appearance and personality. The first actor to portray the Doctor was William Hartnell beginning with An Unearthly Child (1963) through The Tenth Planet (1966). In the final moments of the serial, the First Doctor regenerated into Patrick Troughton's Second Doctor.
The most recent incarnation, the Fifteenth Doctor, was played by Ncuti Gatwa, who took over the role from David Tennant following the conclusion of "The Giggle" (2023). Gatwa departed the role in "The Reality War" (2025).