An alien distress call draws the Doctor and Peri to Earth, 1985, where they uncover a Cyberman plot to change the course of history.
Colin Baker
Nicola Bryant
Maurice Colbourne
Brian Glover
Terry Molloy
James Beckett
David Banks
Michael Kilgarriff
Faith Brown
Sarah Greene
Michael Attwell
Jonathan David
Brian Orrell
John Ainley
Stephen Churchett
Stephen Wale
Sarah Berger
Esther Freud