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
An animated serial, "The Infinite Quest", aired alongside the 2007 series of "Doctor Who" as part of the children's television series "Totally Doctor Who". The serial featured the voices of series regulars David Tennant and Freema Agyeman but is not considered part of the 2007 series. A second animated serial, "Dreamland", aired in six parts on the BBC Red Button service, and the official "Doctor Who" website in 2009.