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
Space and Time (Doctor Who) TARDIS had been previously explored in "The Time Monster" (1972) and "Logopolis" (1980), though both times it was the TARDIS of the Master. Amy also repeats one of her lines from "The Big Bang" at the end of "Space". The special was shot over two days alongside the made-for-DVD "Night and the Doctor" mini-episodes "Bad Night" and "Good Night". It was mostly shot on the first day, where all of the scenes with the TARDIS inside the TARDIS were filmed. Several tricks were used to create the illusion that there were more than one Doctor, Amy, and/or Rory. In scenes