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) Finish did a trilogy of audios featuring the Master in 2016; "And You Will Obey Me" pits the Fifth Doctor against the Beevers incarnation of the Master, seeking to regain his body after an unspecified attack left him seriously injured and hunted, and "Vampire of the Mind" pits the Sixth Doctor against the MacQueen incarnation of the Master, who is seeking to drain the neural energy of the Doctor and various Earth scientists to restore his own mind after some terrible accident. These two storylines come together in "The Two Masters", in which the Seventh Doctor faces both of these