A thrilling and emotional festive special featuring major guest stars, and the Docto's most iconic and deadly adversaries. The Doctor is locked away in a high-security alien prison. Isolated, alone, with no hope of escape. Far away, on Earth, her best friends, Yaz, Ryan and Graham have to pick up their lives without her. But it's not easy. Old habits die hard. Especially when they discover a disturbing plan forming. A plan which involves a Dalek. How can you fight a Dalek, without the Doctor?