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, and 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 creation of the Flux, long ago.

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
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Cast

 * Thirteenth 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

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.

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 advice on a DVD. (TV: Blink)
 * Yaz does not appear to recognise the Weeping Angel, despite having encountered them once before. (COMIC: A Little Help from My Friends)

Home video releases
to be added