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Martin Landau
Commander John Koenig
Barbara Bain
Doctor Helena Russell
Barry Morse
Professor Victor Bergman
Nick Tate
Captain Alan Carter
Prentis Hancock
Paul Morrow
Zienia Merton
Sandra Benes
Roy Dotrice
Commissioner Gerald Simmons
Anthony Valentine
Male Alien
Isla Blair
Female Alien
Philip Madoc
Commander Anton Gorski
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Released
ITC Entertainment
Sylvia Anderson
Producer
Brian Johnson
Special Effects
Lee H. Katzin
Director
Charles Crichton
