The u coming festive s ecial 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 rison. Isolated, alone, with no ho e of esca e. Far away, on Earth, her best friends, Yaz, Ryan and Graham have to ick u their lives without her. But it's not easy. Old habits die hard. Es ecially when they discover a disturbing lan forming. A lan which involves a Dalek