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.
The Caretaker (Doctor Who)
"The Caretaker" is the sixth episode of the eighth series of the British science fiction television programme "Doctor Who", written by Gareth Roberts and Steven Moffat, and directed by Paul Murphy. The episode stars Peter Capaldi, Jenna Coleman, and Samuel Anderson. First broadcast on BBC One on 27 September 2014, it was watched by 6.82 million viewers in the UK, and received positive reviews from television critics.