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) celebratory fiftieth Virgin New Adventures novel, once again trying to restore his ability to regenerate, suggesting that the Tzun nanites failed to sustain him long-term. After the broadcast of the television movie, some fans suggested that this is the incarnation briefly played by Gordon Tipple in the prologue, eventually succumbing once again to the cheetah virus in the first Eighth Doctor novel "The Eight Doctors". Prior to the end of the Virgin Missing Adventures series, the Delgado version of The Master appeared in the novel "Who Killed Kennedy", depicting him setting up a complex plan to manipulate a journalist to