Doctor: Jodie Whittaker
Mandip Gill – Yasmin Khan
John Bishop – Dan Lewis
Aisling Bea – Sarah
Adjani Salmon – Nick
Barnaby Edwards – Dalek Operator 1
Nicholas Pegg – Dalek Operator 2
Jon Davey – Additional Dalek Operator
Nicholas Briggs – Voice of the Daleks
Pauline McLynn – Mary
Jonny Dixon – Karl
Directed by Annetta Laufer
Written by Chris Chibnall
Script editors: Caroline Buckley, Rebecca Roughan
Produced by Sheena Bucktowonsing
Executive producer(s): Chris Chibnall, Matt Strevens, Nikki Wilson
Incidental music composer: Segun Akinola
Running time: 58 minutes
First broadcast 1 January 2022
Shortly before midnight on New Year's Eve, Nick turns up at a storage facility owned and operated by Sarah, who he has a crush on. Meanwhile, the Doctor attempts to reset the TARDIS to remove the damage and anomalies caused by the Flux. Intending to spend time at a beach, she alongside Yaz and Dan exit in the storage facility instead. Unbeknownst to the Doctor, the TARDIS' reset also triggers a time loop.
Nick encounters an Executioner Dalek which kills him and later the Doctor, Yaz, Dan and Sarah. Time resets with Sarah and Nick both trying to save the other but failing and dying to the Dalek again. The Doctor realizes that each reset shortens the time loop by a minute, speculating that it will collapse at midnight. The Daleks reveal that they have detected the TARDIS' energy signature and came to execute the Doctor for her actions in The Vanquishers. Both the group and the Daleks attempt to learn from the previous loops in order to anticipate their enemy's next moves. During the loops, Nick confesses returning each year to see Sarah while Dan points out to the Doctor that Yaz has feelings for her.
Using materials stored in the facility by another employee, including illegal fireworks, the group decides to create a trap that will bring down the facility when fired upon. However, to prevent the Daleks from anticipating the move, they behave completely different in the second-to-last loop before dying again. In the last minute to midnight, they place the materials as well as Sarah's mobile phone while escaping through the basement while the Daleks are searching in the wrong place. Triggered by hearing Sarah's mother calling her phone, the Daleks shoot the trap and ignite the fireworks, exploding the facility and burying them underneath.
The TARDIS finishes restructuring, and the Doctor and her companions leave to find the lost treasure of Flor de la Mar while Sarah and Nick decide to travel the world together.