The Vanquishers (TV story)

, prefixed in the title sequence with Chapter Six and in other sources with Flux, was the sixth episode of series 13 of Doctor Who. It formed the sixth and final chapter of the six-part serial Doctor Who: Flux.

It brought an end to the storylines of the Ravagers, Swarm and Azure, and saw Inston-Vee Vinder finally reunited with his pregnant wife Bel after they spent most of the series looking for one another.

It was the first televised story to see the Doctor coming face to face with the embodiment of Time, although such a thing had previously been presented in the Virgin New Adventures novels.

The episode gave a similar ominous warning of impending doom for the Thirteenth Doctor, as had been previously given to the Tenth Doctor in the 2009 special Planet of the Dead.

Synopsis
Having taken control of Divison's base in the Void, and of the precious fob watch containing the memories stolen from the Doctor by Tecteun, Swarm and Azure stand poised to achieve their ultimate revenge. Meanwhile, the Sontarans, working in conjunction with the Grand Serpent, have taken Earth once again as part of a gleeful scheme to exploit the Flux to become the dominant species in the cosmos once and for all, surpassing even the Daleks and the Cybermen. With the help of Joseph Williamson and his tunnels through time, the Doctor's stranded companions must unite to vanquish the ultimate threats to life in the universe.

Plot
The Doctor runs from Swarm, taking Tecteun's Ood with her. Swarm and Azure chase after the Doctor but the Doctor takes off her conversion plate just as Swarm touches her, causing her to be split into three parts between various locations: the Divison spacecraft, the Lupari ship, and the Liverpool tunnels.

On the Division spacecraft, Azure opens the fob watch to return the Doctor's missing memories to her, but the Doctor refuses to see them. Azure reveals that their plan is to take control of the Flux and control it to be a repeating time loop of endless destruction. The Ood attempts to slow down the effect of the Flux.

In the Passenger, Vinder and Diane disrupt the internal systems allowing them to escape but still leaving them stranded in another unknown environment.

Yaz, Dan, Jericho, and Williamson take out the first wave of Sontarans with lightning from one of the tunnel doors before traveling to the present through another. They meet up with Kate Stewart who is leading a resistance against the Sontaran invasion. Having discovered Sontaran's weakness for their love of Earth chocolate, the Doctor makes a deal with them of chocolate in exchange for two human psychic operatives, Claire and Jericho, who will help them find the coordinates for the final Flux event to reach Earth.

On the Lupari ship, the Doctor pilots it away from the shield formation to crash into the Dark Energy Camera in Chile where the Sontarans have set up base. They are stopped by a force shield and are captured, just like the Doctor intended. As they are held in a cell on one of the Sontaran ships, Karvanista reveals to the Doctor that during her time working for the Division, he was her companion, but cannot say more about it as the Division put an implant in his brain that would kill him if he spoke of their time together. As the Doctor is taken away for interrogation by the Sontarans, they tell Karvanista that all of the Lupari were destroyed by the Sontarans. During interrogation by the Grand Serpent, one of the Doctors travels in the TARDIS and frees herself while also trapping the Grand Serpent with his own torture device. At the same time, Bel downloads transmissions from the Sontaran ship.

The transmissions reveal the Sontarans offering an alliance with the Cybermen and Daleks. In reality, the Sontarans are using the guise of a peace alliance in order to sacrifice them to slow the Flux, thus vanquishing their enemies while they remain safe behind the Lupari shields. Claire is able to escape the Sontaran ship, but Jericho is not. The Doctor also manages to rescue Vinder and Diane, who share a happy reunion with Bel and Dan. In a turn of plans, the Doctor reforms the Lupari shield behind the Sontarans instead of in front of thus leaving the Sontarans and Jericho to be consumed by the Flux along with the Daleks and Cybermen. Some of the Flux makes it past the shield, so the Doctor uses the Passenger, a source of endless matter, to absorb the Flux remnants.

Azure and Swarm bring the Doctor to Atropos to sacrifice her to Time, but since the Flux was destroyed thus failing to free Time, Time destroys them. Time lets the Doctor go but forebodingly warns her that the end is coming for her before reunifying her. In the Liverpool tunnels, Kate and Vinder strand the Grand Serpent on a small asteroid through one of the doors. Vinder and Bel decide to travel with Karvanista. Back in Liverpool, Dan invites Diane to go for a drink with him, which they were unable to do due to what had happened. However, Diane, due to her experiences, turns down the offer. The Doctor invites Dan to join her and Yaz on their travels. The Doctor deposits the fob watch containing her lost memories into the TARDIS interior, telling it to hide it until she really asks for it.

Cast

 * The Doctor - Jodie Whittaker
 * Yasmin Khan - Mandip Gill
 * Dan Lewis - John Bishop
 * Swarm - Sam Spruell
 * Azure - Rochenda Sandall
 * Williamson - Steve Oram
 * Professor Jericho - Kevin McNally
 * Karvanista - Craige Els
 * Bel - Thaddea Graham
 * Kate Stewart - Jemma Redgrave
 * Sontaran Commander Stenck - Jonathan Watson
 * Grand Serpent - Craig Parkinson
 * Senstarg/Shallo/Kragar - Dan Starkey
 * Claire Brown - Annabel Scholey
 * Vinder - Jacob Anderson
 * Diane - Nadia Albina
 * Ood - Simon Carew
 * Voice of the Ood - Silas Carson
 * Passenger - Jonny Mathers
 * Stevie (Grand Serpent Victim) - Sonny Walker
 * Voice of the Daleks/Cybermen - Nicholas Briggs

Uncredited cast

 * Time - Sam Spruell
 * Time - Jodie Whittaker

Crew
to be added

Individuals

 * The Doctor gives Joseph Williamson a "Paul Hollywood handshake".

Story notes

 * This episode is set on the same day it was broadcast, 5 December 2021. This makes it one of only six episodes in the revived series to do so, following after The End of Time: Part One on 25 December 2009, The Big Bang on 26 June 2010, The Impossible Astronaut on 22 April 2011, Resolution on 1 January 2019, and The Halloween Apocalypse on 31 October, 2021.
 * Incidentally, this means that both the first and the final Chapter of Doctor Who: Flux were broadcast on the day they take place.

Ratings

 * Overnights: 3.58 million
 * Consolidated: to be added

Filming locations
to be added

Production errors

 * When the Doctor speaks to Yaz as Dan leaves to find his bedroom in the Doctor's TARDIS, Dan can initially be seen walking up the steps to the corridor but disappears when the camera zooms in on Yaz.

Continuity

 * The Doctor asks Karvanista about their past, revealing that she saw him in her past at the Temple of Atropos. (TV: Once, Upon Time)
 * Claire recalls the Doctor being taken away by the Weeping Angels. (TV: Village of the Angels)
 * Dan realises him releasing Karvanista was what the wise man was referring to by "fetch your dog". (TV: Survivors of the Flux)
 * The Doctor is warned about her impending regeneration. The Tenth Doctor previously had similar warnings. (TV: Planet of the Ood, Planet of the Dead)

DVD releases
to be added

Blu-ray releases
to be added

Digital releases
to be added