Twice Upon a Time (Doctor Who) Twice Upon a Time (Doctor Who) "Twice Upon a Time" is an episode of the British science fiction television series "Doctor Who", written by Steven Moffat, directed by Rachel Talalay, and was broadcast as the thirteenth Christmas special on 25 December 2017 on BBC One. It features the final regular appearance of Peter Capaldi as the Twelfth Doctor, the first official appearance of Jodie Whittaker as the Thirteenth Doctor, and guest-stars David Bradley as the First Doctor, having previously portrayed original First Doctor actor William Hartnell in the 2013 docudrama "An Adventure in Space and Time". Pearl Mackie guest stars
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