"Twice Upon a Time" is a special episode of the British science fiction television series Doctor Who, broadcast on BBC One on 25 December 2017 as the programme's thirteenth Christmas special. The epis
Promotional poster
"Twice Upon a Time" was Steven Moffat's last Doctor Who episode as showrunner.
David Bradley portrayed the First Doctor, having previously portrayed William Hartnell in An Adventure in Space and Time.
Rachel Talalay directed the episode.
Boom (Doctor Who)
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"Boom" is the third episode of the fourteenth series of the British science fiction television series Doctor Who. It was written by Steven Moffat, who had previously been showrunner from 2010 to 2017,
Promotional title-card
The episode marked the return of Steven Moffat, a former showrunner, to the series as a guest writer and executive producer.