'Prisoners on the Lost Planet' by Anthony Marriott

When Space City’s new long-range receiver detects a distress call from uncharted space, Steve Zodiac sets off in Fireball XL5 to investigate. Having survived a meteor storm and high levels of radiation, Steve and his crew soon land on a misty planet, where they meet the exiled queen of a race of space Amazons. But when Steve points out that he cannot help the queen because she has been legally sentenced by her people, the woman drugs him and then threatens to activate a nearby volcano that will destroy the entire planet…

Paul Maxwell (Colonel Steve Zodiac), Sylvia Anderson (Doctor Venus / Aphros), David Graham (Professor Matt Matic / Lieutenant 90), John Bluthal (Commander Zero), Gerry Anderson (Robert the Robot)

Directed by Bill Harris
Produced by Gerry Anderson
Associate Producer Reg Hill

TX (UK - ITV):
29th July 1963

Notes:
*Featuring Colonel Steve Zodiac, Venus, Professor Matt Matic, Commander Zero, Lieutenant 90 and Robert the Robot