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 Doctor (Doctor Who) Doctor, characters reply "Doctor who?" The story arc running throughout the tenure of the Eleventh Doctor involved the oldest question in the universe, revealed in "The Wedding of River Song" to be "Doctor who?", giving the phrase in-universe significance. In "The Name of the Doctor", the Doctor's real name was revealed to be the password used to enter the Doctor's tomb following his death on the planet Trenzalore. The story arc was resolved in "The Time of the Doctor", wherein it was revealed to be projected by the Time Lords across all of time and space through a "crack in