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.
Cast
Jon Pertwee
The Doctor
Caroline John
Liz Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart
Ronald Allen
Ralph Cornish
John Abineri
Carrington
Robert Cawdron
Taltalian
Michael Wisher
John Wakefield
Cheryl Molineaux
Miss Rutherford
Ray Armstrong
Grey
Robert Robertson
Collinson
Ric Felgate
Van Lyden / Alien Ambassador
Dallas Cavell
Quinlan
Bernard Martin
Control Room Assistant
John Moreno
Dobson
James Haswell
Corporal Champion
Derek Ware
UNIT Sergeant
William Dysart
Reegan
Cyril Shaps
Lennox
Gordon Sterne
Heldorf
Steve Peters
Alien Ambassador / Lefee
Neville Simons
Alien Ambassador / Michaels
Max Faulkner
UNIT Soldier
John Lord
Masters
Tony Harwood
Flynn
John Levene
Sergeant Benton
James Clayton
Private Parker
Joanna Ross
Control Room Assistant
Carl Conway
Control Room Assistant
Roy Scammell
Technician
Peter Noel Cook
Alien Space Captain
Peter Halliday
Aliens' Voices
Geoffrey Beevers
Private Johnson
Crew
Michael Ferguson
Director
David Whitaker
Writer
Terrance Dicks
Script Editor
Don Godden
Editor
Chris Wimble
Editor
Ron Bowman
Editor
Barry Letts
Producer
Tony Leggo
Camera Operator
A.A. Englander
Camera Operator
Christine Rawlins
Costume Design
Gordon Mackie
Sound
Brian Hiles
Sound
Ralph Walton
Lighting Director
Geoff Shaw
Lighting Director
Dave Sydenham
Lighting Director
Ian Scoones
Visual Effects
Peter Day
Visual Effects
Dudley Simpson
Original Music Composer
Brian Hodgson
Special Sound Effects
Dick Coles
Assistant Production Design
Delia Derbyshire
Theme Song Performance
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