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 in Canada and the United States
Conventions, personal appearances of cast members and production staff as well as the national airing on PBS of the 20th anniversary special "The Five Doctors" two days before the BBC sealed the success of the program in America. In November 1983, on the weekend after the airing of "The Five Doctors", four actors who played the Doctor (Patrick Troughton, Jon Pertwee, Peter Davison and Tom Baker) and many of those who played the Doctor's companions over the series' first two decades on television appeared at a standing-room-only event in Chicago, the start of a Thanksgiving Day weekend celebration that continues annually.
In 1986, BBC Enterprises organised the "Doctor Who USA Tour", a two-year travelling exhibition of props and memorabilia from the program, showcased in a 48-foot trailer decorated with alien landscapes from the show, police box entrances, and a mock-up of the TARDIS interior. Many tour stops included guest appearances from cast members.