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
Doctor Who and the Daleks in the Seven Keys to Doomsday early 1970s, and was a fan of "Doctor Who". In 2008 Big Finish Productions released "The Seven Keys to Doomsday" as an audio drama, directed by John Ainsworth. Doctor Who and the Daleks in the Seven Keys to Doomsday Doctor Who and the Daleks in the Seven Keys to Doomsday was a stage play based on the long-running British science fiction television series "Doctor Who". The play ran at the Adelphi Theatre in London, England for four weeks, beginning on 16 December 1974. Originally, the part of the Doctor was to be played by Jon Pertwee, but the role went