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
Since 1999, Big Finish Productions has released several different series of Doctor Who audios on CD. The earliest of these featured the Fifth, Sixth and Seventh Doctors, with Paul McGann's Eight Doctor joining the line in 2001. Tom Baker's Fourth Doctor began appearing for Big Finish in 2012. Along with the main range, adventures of the First, Second and Third Doctors have been produced in both limited cast and full cast formats, as well as audiobooks. The 2013 series "", produced as part of the series' 50th Anniversary celebrations, marked the first time Big Finish created stories (in this case audiobooks) featuring the Doctors from the revived show. Along with this, in May 2016 the Tenth Doctor, David Tennant, appeared alongside Cathrine Tate in a collection of three audio adventures.