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) pitted against "The Dream Lord", a manifestation of his self-loathing and anger, in "Amy's Choice". Later, the Eleventh Doctor entered his own timeline in "The Name of the Doctor" to rescue his companion Clara Oswald, and while there observed a past incarnation portrayed by John Hurt, one whose actions caused him to be unworthy of the name "Doctor" and viewed as shameful by his future selves. In the 50th anniversary special, "The Day of the Doctor", the Eleventh Doctor encounters both the Tenth Doctor and the War Doctor (played by John Hurt). The Tenth and Eleventh Doctors are generally amicable