Astronauts rescued from a mission to mars are kidnapped when they arrive back on earth. They seem to have been irradiated, and can now kill people merely by touching them. But the Doctor discovers the astronauts have been replaced with Alien ambassadors who are being forced to behave in a hostile manner. With The Doctor traveling to the alien mother ship, and Liz kidnapped, The Brigadier is left wondering who to trust.
Genres:
Jon Pertwee as The Doctor
Caroline John as Liz Shaw
Nicholas Courtney as Brigadier Lethbridge-Stewart
Ronald Allen as Ralph Cornish
John Abineri as Carrington
Robert Cawdron as Taltalian
Michael Wisher as John Wakefield
Cheryl Molineaux as Miss Rutherford
Ray Armstrong as Grey
Robert Robertson as Collinson
Ric Felgate as Van Lyden / Alien Ambassador
Dallas Cavell as Quinlan
Bernard Martin as Control Room Assistant
John Moreno as Dobson
James Haswell as Corporal Champion
Derek Ware as UNIT Sergeant
William Dysart as Reegan
Cyril Shaps as Lennox
Gordon Sterne as Heldorf
Steve Peters as Alien Ambassador / Lefee
Neville Simons as Alien Ambassador / Michaels
Max Faulkner as UNIT Soldier
John Lord as Masters
Tony Harwood as Flynn
John Levene as Sergeant Benton
James Clayton as Private Parker
Joanna Ross as Control Room Assistant
Carl Conway as Control Room Assistant
Roy Scammell as Technician
Peter Noel Cook as Alien Space Captain
Peter Halliday as Aliens' Voices
Geoffrey Beevers as Private Johnson
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