Twice Upon a Time (TV story)

 was the 2017 Doctor Who Christmas special. As the final episode under showrunner Steven Moffat's tenure, it saw Peter Capaldi's Twelfth Doctor regenerate into Jodie Whittaker's Thirteenth Doctor. It also saw David Bradley star as the First Doctor at the time when his Doctor was also close to regenerating.

Synopsis
Two Doctors stranded in a forbidding snowscape, refusing to face regeneration. In the final chapter of the Twelfth Doctor's adventure, he must face his past to decide his future. It is the end of an era, but the Doctor's journey is only just beginning...

Plot
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Cast

 * The Doctor - Peter Capaldi
 * The Doctor - David Bradley
 * Bill - Pearl Mackie
 * The Captain - Mark Gatiss
 * Clara - Jenna Coleman
 * Nardole - Matt Lucas
 * The Glass Woman - Nikki Amuka-Bird
 * German Soldier - Toby Whithouse
 * Polly - Lily Travers
 * Ben - Jared Garfield
 * Voice of the Daleks - Nicholas Briggs
 * And introducing Jodie Whittaker as the Doctor

The Tenth Planet

 * The Doctor - William Hartnell (archival)
 * Polly - Anneke Wills (archival)
 * Ben - Michael Craze (archival)

Crew
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Story notes
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Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor recalls Bill's cyber-conversion and apparent death. (TV: World Enough and Time / The Doctor Falls)
 * Bill reminds the Doctor about Heather and the sentient oil. (TV: The Pilot)
 * The Doctors promise to check up on the family of Lethbridge-Stewart. (TV: The Web of Fear et al.)
 * The Doctor was present for the Christmas truce of 1914 earlier in his first incarnation (PROSE: The Little Drummer Boy) as well as during his fifth (PROSE: Never Seen Cairo) and ninth incarnations. (COMIC: The Forgotten)
 * The Doctor once more explains why he ran away from Gallifrey. (TV: Heaven Sent)
 * The Doctor meets Rusty again. (TV: Into the Dalek)
 * The Doctor refers to the year 5 billion and New Earth. (TV: New Earth, Gridlock)
 * The Doctor holds a Dalek Eyestalk. (TV: The Wedding of River Song, The Time of the Doctor)
 * The Doctor is referred to as "the Doctor of War". (TV: A Good Man Goes to War, The Name of the Doctor, The Day of the Doctor)
 * The Doctor encounters his first incarnation. He has experienced such before, (TV: The Three Doctors, The Five Doctors, The Day of the Doctor) and also struggles to remember the encounter. (TV: Time Crash)
 * The Testimony shows the Doctors the amount of times they have become associated with wars. Notably, events from The Waters of Mars, Journey's End, The Day of the Doctor, The Name of the Doctor.
 * The Eleventh Doctor's conflict at Trenzalore is mentioned by the Testimony, (TV: The Time of the Doctor) as is the Time war. (TV: Dalek et. al)
 * The Doctor mentions the Dalek's Pathweb. (TV: Asylum of the Daleks, The Time of the Doctor)

DVD releases
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Blu-ray releases
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Digital releases
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