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
An Adventure in Space and Time from "The Daleks' Master Plan" using original actress Jean Marsh to play the increasingly aging Sara, and to use Super 8 footage of a recreation of the "Radio Times" publicity photo-shoot for "The Three Doctors", but the budget did not accommodate these ambitions. Principal photography for the film began in February 2013. Filming primarily took place at Wimbledon Studios in London, and the BBC Television Centre; it was the final drama to be recorded at the latter, which closed one month after filming concluded. Location filming took place on 17 February 2013, on Westminster Bridge in London. This involved replicas