Twice Upon a Time (Doctor Who) and Time". This makes him the third actor to play the role in the television programme, after William Hartnell and Richard Hurndall (in 1983's "The Five Doctors") since the premiere of "Doctor Who" in 1963. Bradley previously played Solomon in the 2012 episode "Dinosaurs on a Spaceship". The first trailer for the episode was shown during the 2017 San Diego Comic-Con, revealing the return of Polly, a companion from the end of William Hartnell's tenure as the First Doctor, portrayed by Lily Travers, and Pearl Mackie as Bill Potts. Also confirmed were appearances by Toby Whithouse, writer of seven episodes
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