Lt. 90 qualifies for his astronauts wings by landing XL5 in one piece and then piloting XL1 off the launch rail, but on his return to Earth in a capsule, he finds it has caught fire!
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)