Two mighty armies wage war across the Earth; terror emerges from beneath Torchwood Tower; the Doctor faces a dilemma.
Director:
Graeme Harper
Cast:
David Tennant
Billie Piper
Camille Coduri
Shaun Dingwall
Noel Clarke
Raji James
Tracy-Ann Oberman
Paul Kasey
Barnaby Edwards
Nicholas Pegg
Anthony Spargo