Once, Upon Time (TV story)

Once, Upon Time was the third episode of series 13 of Doctor Who. It formed the third chapter of the six-part serial Doctor Who: Flux.

This chapter saw the Thirteenth Doctor revisiting lost memories in her own time stream. As such, it re-introduced the Fugitive Doctor, and began to piece together how she fits in with the Siege of Atropos and the origin of the Flux, long ago. It also connects the Division, and their creation of the planet Time, to the ending of the Dark Times, linking these new revelations to the expansive mythology of the existing Doctor Who universe.

As the episode focused in on each character's history, Once, Upon Time also shone light on Vinder's story, including how he came to be on Outpost Rose, and what will be his main motivation: reconnecting with Bel, who is shown making her own way to find him.

Bel's storyline in the episode also highlights the Flux's impact on the wider universe, with many worlds overtaken, and provides an anchor for the audience to understand what the Great Disruption has done to local time.

Synopsis
Atropos has fallen, once again. The Doctor has thrown herself into a time storm in a desperate bid to save her friends. As Time itself comes apart, she finds much more than she bargained for.

All four are lost, together, in memories: past, present, future. So many roles they play. So many choices they have endured. And now, what happened once has come again.

Plot
to be added

Cast

 * The Doctor - Jodie Whittaker
 * Yasmin Khan - Mandip Gill
 * Dan Lewis - John Bishop
 * Bel - Thaddea Graham
 * Azure - Rochenda Sandall
 * Swarm - Sam Spruell
 * Vinder - Jacob Anderson
 * Diane - Nadia Albina
 * Fugitive Doctor - Jo Martin
 * Joseph Williamson - Steve Oram
 * Grand Serpent - Craig Parkinson
 * Sonya Khan - Bhavnisha Parmar
 * Old Swarm - Matthew Needham
 * Karvanista - Craige Els
 * Awsok - Barbara Flynn
 * Passenger - Jonny Mathers
 * Police Officer - Chantelle Pierre
 * Voice of the Cybermen - Nicholas Briggs
 * Voice of the Mouri - Amanda Drew
 * Priest Triangle - Nigel Lambert

Uncredited cast

 * Mouri - TBA
 * Commander - TBA
 * Weeping Angel - TBA

Crew
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Story notes

 * The credits of this episode cemented the term "Fugitive Doctor" — gained from the episode where this incarnation first appeared, Fugitive of the Judoon, and widely used in Doctor Who fandom up to this point — as a DWU term.
 * This episode establishes the "Fugitive Doctor" as a past incarnation, something which had been left ambiguous since her debut in Fugitive of the Judoon.

Ratings
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Filming locations
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Production errors
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Continuity

 * The Doctor notes, worriedly, "The Angel has the TARDIS", echoing back to the Tenth Doctor's words, recorded for Sally Sparrow. (TV: Blink)
 * Yaz does not appear to recognise the Weeping Angel. In one account, she has encountered them before. (COMIC: A Little Help from My Friends)
 * The Doctor refers to herself as "your future" to the "Fugitive Doctor". (TV: Fugitive of the Judoon)

Home video releases
to be added