Fireball XL2 has crashed on Planet Monotane, and Fireball XL5 is sent to investigate, only to run into a sort of space dinosaur...
Sylvia Anderson
Writer
Gerry Anderson
John Kelly
Director
Robert the Robot (voice) (uncredited)
David Graham
Lieutenant Ninety (voice)
Doctor Venus (voice)
Paul Maxwell
Colonel Steve Zodiac (voice)
John Bluthal
Commander Wilbur Zero (voice)
Guest Star