Major Jim Ireland returns to Earth after 10 years in space, but unknown to everyone, he has become an agent for Kudos, the only survivor from the planet Zanadu, who wants revenge on all Lazoones for destroying his people.
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)