- Jodie Whittaker (The Doctor)
- Mandip Gill (Yasmin 'Yaz' Khan)
- John Bishop (Dan Lewis)
Episode: The Halloween Apocalypse
Air Date: 2021-10-31
Runtime: 51 min
On Halloween, all across the universe, terrifying forces are stirring. The life of Dan Lewis is about to change forever. Why is the Doctor chasing Karvanista? What is the Flux?