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.
List of Doctor Who audio plays by Big Finish
The dramas feature both former actors who portrayed the Doctor and his companions, and new continuing characters as well as elements from other spin-off media. The canonicity of the audio dramas, as with other "Doctor Who" spin-off media, is unclear. To date, productions have featured the Fourth (Tom Baker), Fifth (Peter Davison), Sixth (Colin Baker), Seventh (Sylvester McCoy), Eighth (Paul McGann), War (Sir John Hurt) and Tenth (David Tennant) Doctors portrayed by their original actors.