Battle rages across the skies as the Unholy Trinity unleash their deadly ambition. The Doctor, Belinda and Ruby have to risk everything in the quest to save one innocent life.
| Name | Type | Role | |
|---|---|---|---|
| Russell T Davies | Writer | ||
| Susan Twist | Guest Star | Susan Triad | |
| Jodie Whittaker | Guest Star | The Doctor | |
| Nicholas Briggs | Guest Star | Omega | |
| Ruth Madeley | Guest Star | Shirley Bingham | |
| Alexander Devrient | Guest Star | Colonel Christofer Ibrahim | |
| Billie Piper | Guest Star | The Doctor | |
| Nila Aalia | Guest Star | Lakshmi Chandra | |
| Jonah Hauer-King | Guest Star | Conrad Clark | |
| Aidan Cook | Guest Star | The Vlinx | |
| Archie Panjabi | Guest Star | The Rani | |
| Sienna-Robyn Mavanga-Phipps | Guest Star | Poppy | |
| Yasmin Finney | Guest Star | Rose Noble | |
| Stephanie de Whalley | Guest Star | Anita Benn | |
| Jemma Redgrave | Guest Star | Kate Lethbridge-Stewart | |
| Bonnie Langford | Guest Star | Melanie Bush | |
| Sam Lawton | Guest Star | Winnie Petheridge | |
| Alex Pillai | Director |