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 in Australia were still only around twelve months behind their original BBC transmission dates. In October 1966 the first episode of "The Space Museum" marked the first time the ABC stripped Doctor Who in the 6:30 Monday–Thursday timeslot. With only occasional changes or minor variations to days and times, the ABC continued to strip "Doctor Who" in a weekday early-evening timeslot for much of the next twenty-six years. Later in 1966 the ABC also started showing repeats of chunks of the most recent first-run stories in the same stripped prime-time slot. (Repeats not only remained commonplace, but their regularity also went on