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 Master (Doctor Who) which looks at how he stole a new body in the early twentieth century after his essence escaped from the Eighth Doctor's TARDIS, and survived by possessing a series of human hosts until he tricked UNIT into helping him regain access to his TARDIS. Alex MacQueen plays a new incarnation of the Master in the Seventh Doctor boxset "UNIT Dominion" and later in the Eighth Doctor boxsets "Dark Eyes 2", "Dark Eyes 3" and "Dark Eyes 4". Macqueen's Master is revealed to be an incarnation between Eric Roberts' Master and Derek Jacobi's, having been rescued by the Time Lords who