Commander John Koenig
Martin Landau
Doctor Helena Russell
Barbara Bain
Benjamin Ouma
Lon Satton
Eddie Collins
Eric Carte
David Kano
Clifton Jones
Luna Commission Chairman
Patrick Allen
Main Mission Operator
Christopher Matthews
Professor Victor Bergman
Barry Morse
Captain Alan Carter
Nick Tate
Paul Morrow
Prentis Hancock
Sandra Benes
Zienia Merton
Commissioner Gerald Simmons
Roy Dotrice
Male Alien
Anthony Valentine
Female Alien
Isla Blair
Commander Anton Gorski
Philip Madoc
Executive Producer
Gerry Anderson
Director
Charles Crichton
Lee H. Katzin
Producer
Sylvia Anderson
Special Effects
Brian Johnson
Screenplay
George Bellak
Christopher Penfold