A desperate call for help as the residents of Moonbase Alpha are hurled into an interplanetary power struggle. As tensions rise, disaster strikes when a routine mission becomes a nightmare...

Martin Landau
as Commander Koenig

Barbara Bain
as Dr. Helena Russell

Catherine Schell
as Maya

Tony Anholt
as Tony Verdeschi

Nick Tate
as Alan Carter

John Hug
as Bill Fraser

Sam Dastor
as Dr. Ed Spencer

Zienia Merton
as Sandra

Yasuko Nagazumi
as Yasko

Alibe Parsons
as Alibe