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It's 1999 and Moonbase Alpha has been built on the Moon to safeguard the nuclear waste shipped from Earth. On September 13, 1999, disaster strikes and the nuclear waste explodes, causing a chain reaction that hurls the Moon out of Earth's orbit and into deep space.

Cast: Tanya Alexander - Suzanne Roquette; Com. John Koenig - Martin Landau; Dr. Bob Mathias - Anton Phillips; Victor Bergman - Barry Morse; Paul Morrow - Prentis Hancock; Dr. Helena Russell - Barbara Bain; Cap. Alan Carter - Nick Tate; Sandra Benes - Zienia Merton; David Kano - Clifton Jones; Main Computer Voice - Barbara Kelly; Maya - Catherine Schell; Tony Verdeschi - Tony Anholt;

Network: ITV (United Kingdom)
Premiered: 04.September.1975
Status: Ended