The Doctor (Doctor Who) footage. Tom Baker did reappear, but as "the Curator", an ambiguously different character who he was not credited for playing. A voice actor, John Guilor, recorded a line of audio impersonating the First Doctor, for which he was credited as "Voice Over Artist". In other multi-Doctor stories, the multiple actors are all credited as "The Doctor", the exception being "The Three Doctors" (1972–73), which credited William Hartnell, Patrick Troughton and Jon Pertwee as "Doctor Who" as the 1972 serial preceded the practice of crediting the character as "The Doctor". In "Human Nature" (2007), the plot involves the Tenth Doctor altering
The Ark (Doctor Who) The Ark (Doctor Who) The Ark is the fifth serial of the third season of the British science fiction television series "Doctor Who", which was first broadcast in four weekly parts from 5 to 26 March 1966. The serial is set in the far distant future, at least ten million years. In the first two episodes of the serial, the time traveller the First Doctor (William Hartnell) and his travelling companions Steven Taylor (Peter Purves) and Dodo Chaplet (Jackie Lane) arrive on a generation ship Dodo names "the Ark", where the Doctor searches for a cure for a fever that