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) elaborate that the Doctor chose the name as a promise for the sort of man he wants to be: "Never cruel or cowardly. Never giving up and never giving in." By contrast, the Eleventh Doctor spoke of the War Doctor (John Hurt) as being the man who broke that promise, being the one to fight in the Time War before learning the actual fate of the Time Lords. Since contradicted by the television series, the 2003 Telos novella "Frayed" by Tara Samms, set prior to the programme's first episode in 1963, presents the alternative explanation that the Doctor was given