The Doctor (Doctor Who)
The Doctor is the title character in the long-running BBC science fiction television programme "Doctor Who". Since the show's inception in 1963, the character has been portrayed by thirteen lead actors. In the programme, "the Doctor" is the alias assumed by a centuries-old alien—a Time Lord from the planet Gallifrey—who travels through space and time in the TARDIS, frequently with companions. The transition to each succeeding actor is explained within the show's narrative through the plot device of "regeneration", a biological function of the Time Lord race that allows a change of cellular structure and appearance with recovery following a potentially fatal injury.
Doctor Who (season 6)
The sixth season of British science fiction television series "Doctor Who" began on 10 August 1968 with the first story of season 6 "The Dominators" and ended Patrick Troughton's reign as the Doctor with its final story "The War Games". Only 37 out of 44 episodes are held in the BBC archives; 7 remain missing. As a result, 2 serials are incomplete.Patrick Troughton, Frazer Hines and Wendy Padbury make their final appearances as the Second Doctor, Jamie McCrimmon and Zoe Heriot respectively. Troughton and his fellow actors collectively decided that the workload of "Doctor Who" was exhausting them, and that they would soon depart from the show. From Season 7 onwards the show would never have such a high number of episodes again. The three actors remained with the show until the conclusion of the final season six serial "The War Games".