Doctor Who Doctor's nature, somewhere between the twelfth and final incarnation. On rare occasions, other actors have stood in for the lead. In "The Five Doctors", Richard Hurndall played the First Doctor due to William Hartnell's death in 1975; 34 years later David Bradley similarly replaced Hartnell in "Twice Upon a Time". In "Time and the Rani", Sylvester McCoy briefly played the Sixth Doctor during the regeneration sequence, carrying on as the Seventh. For more information, see the list of actors who have played the Doctor. In other media, the Doctor has been played by various other actors, including Peter Cushing in
Doctor Who and the Daleks in the Seven Keys to Doomsday Doctor Who and the Daleks in the Seven Keys to Doomsday Doctor Who and the Daleks in the Seven Keys to Doomsday was a stage play based on the long-running British science fiction television series "Doctor Who". The play ran at the Adelphi Theatre in London, England for four weeks, beginning on 16 December 1974. Originally, the part of the Doctor was to be played by Jon Pertwee, but the role went instead to character actor Trevor Martin. Martin had previously appeared in "Doctor Who" as a Time Lord in the 1969 serial, "The War Games". In the play, it