The Doctor: Ncuti Gatwa
Companions: Varada Sethu – Belinda Chandra, Millie Gibson – Ruby Sunday
Others
Jodie Whittaker – Thirteenth Doctor
Billie Piper[a]
Archie Panjabi – The Rani
Anita Dobson – Mrs Flood
Steph de Whalley – Anita Benn
Sam Lawton – Winnie Petheridge
Ruth Madeley – Shirley Bingham
Michelle Greenidge – Carla Sunday
Jonah Hauer-King – Conrad Clark
Sienna-Robyn Mavanga-Phipps – Poppy
Jemma Redgrave – Kate Lethbridge-Stewart
Susan Twist – Susan Triad
Alexander Devrient – Colonel Christofer Ibrahim
Aidan Cook – The Vlinx
Yasmin Finney – Rose Noble
Bonnie Langford – Melanie Bush
Angela Wynter – Cherry Sunday
Nicholas Briggs – Voice of Omega
Nila Aalia – Lakshmi Chandra
Directed by Alex Sanjiv Pillai
Written by Russell T Davies
Produced by Chris May
Executive producer(s): Russell T Davies, Julie Gardner, Jane Tranter, Joel Collins, Phil Collinson
Music by Murray Gold
Series 15
Running time: 66 minutes
First broadcast 31 May 2025
As Earth collapses out of reality, the Doctor is rescued by Anita Benn, who brings him to the Time Hotel. He learns the Rani has put Earth, under Conrad Clark's wish, into a time loop, resetting it each time reality collapses. The Doctor and Anita uses the Time Hotel's doors to restore the memories of his companion Belinda Chandra and everyone at UNIT HQ, while Ruby Sunday and other UNIT agents have their memories restored via chip implants.
The Rani and Mrs. Flood confront the Doctor, revealing their plan to bring Omega into the universe and use him as a gene bank to create a new race of Time Lords under their rule. The Doctor decides to prevent this, and has Belinda take Poppy, their daughter created in this altered reality, into a special chamber to prevent Poppy being erased once reality is restored to normal. He infiltrates the Rani's palace as Omega is brought into existence. Omega states he intends to consume all and eats the Rani. Mrs. Flood flees and the Doctor forces Omega back into his prison using the Vindicator. Ruby breaches the palace to steal control of Desderium, the infant god used to power Conrad's wish. Ruby wishes for Conrad to be happy in a new life and for his wish to be undone. The Doctor rejoins her in the TARDIS and makes a wish for Desderium to no longer grant wishes.
Reality is restored back to normal, though with minor alterations. Desiderium is given to Ruby's family, and Anita departs for the Time Hotel, revealing to the Doctor that "the Boss" extends greetings to him. The Doctor and Belinda prepare to depart with Poppy in the TARDIS. Poppy, however, is erased from existence, and only Ruby remembers her. After being convinced by Ruby and UNIT's personnel, the Doctor, briefly assisted by his thirteenth incarnation, departs in the TARDIS to channel a regeneration into the time vortex to slightly shift the timeline, which would restore Poppy to reality. The shift results in a timeline where Poppy exists as Belinda's daughter, but not his. After bidding farewell, he departs to undergo his next regeneration, taking on a new form resembling former companion Rose Tyler.
The Reality War