A thrilling and emotional festive special will see the return of one of the Doctor's biggest and most feared enemies: the Daleks. 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?