XL27 makes an emergency landing at Space City and the crew are all found to be unconcious. XL27's route is traced back to planet Zavia where the inhabitants plan to freeze the Earth by deflecting the sun's rays.
Gerry Anderson
Robert the Robot (voice) (uncredited)
David Graham
Lieutenant Ninety (voice)
Sylvia Anderson
Doctor Venus (voice)
Paul Maxwell
Colonel Steve Zodiac (voice)
John Bluthal
Commander Wilbur Zero (voice)