The episode stars Jodie Whittaker as the Thirteenth Doctor, alongside Mandip Gill and John Bishop as her companions, Yasmin Khan and Dan Lewis, respectively.
The Weeping Angels transport the Doctor to a spacecraft carrying Division's head, Awsok from "Once, Upon Time", who is ordering an Ood to create a final Flux event.
Awsok reveals herself to be Tecteun, the Gallifreyan who found the young Doctor by a wormhole and raised her, while creating Time Lords ("The Timeless Children").
A Nepalese hermit suggests they should reunite with Karvanista; although they leave a message for him at the Great Wall of China, he cannot use time travel so cannot respond.
The trio search out Joseph Williamson and the mysterious tunnels he dug under Liverpool, realizing he had discovered doorways leading to various time periods and locations.
Vinder also pursues the Passenger signal, arriving moments after Bel's ship is recalled, but finding kidnapped survivors being disintegrated by Swarm and Azure for use as a power source.
[5] The episode also featured an off-screen voice cameo from Nicholas Courtney, using archive audio, as Alastair Lethbridge-Stewart, the father of Redgrave's character.
[18] Chris Allcock called “Tecteun’s motivations very messy” and “also largely meaningless” due to her sudden death.
[19] In a review for The Daily Telegraph, Michael Hogan criticised on the character’s personality and death with Caroline Siede of The A.V.