When Earth's skies are frozen by a strange alien force, Clara cannot find the Doctor, who is hiding from his past.
Director:
Graeme Harper
Cast:
Peter Capaldi
Jenna-Louise Coleman
Jenna Coleman
Michelle Gomez
Samuel Anderson
Julian Bleach
Jemma Redgrave
Jaye Griffiths
Daniel Hoffmann-Gill
Aaron Neil
Clare Higgins
Kelly Hunter
Jared Garfield
Jaye Griffiths