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
Space and Time (Doctor Who) canonical. The canonicity of the two mini-episodes was affirmed by Moffat in "Doctor Who Magazine". Moffat stated that, unlike "The Curse of Fatal Death", "Space" and "Time" is not a spoof or a sketch, but rather "a little miniature story" in the style of the "Children in Need" mini-episodes. He described it as "A moment of life aboard the TARDIS. But obviously life about the TARDIS instantly gets you into terrible jeopardy, and all of causality is threatened. As I'm sure it is every day when they get up and have their coffee..." The concept of a TARDIS inside the