'The Wings of Danger' by Alan Fennell

In retaliation for the capture of their leader, the Subterrians hatch a plot to kill Steve Zodiac. After Space City detects strange signals coming from Planet 46, Lieutenant Ninety sends Fireball XL5 to investigate – but when Steve goes down to the surface, he is poisoned by a robot bird equipped with deadly radium capsules…

Paul Maxwell (Colonel Steve Zodiac), Sylvia Anderson (Doctor Venus), David Graham (Professor Matt Matic / Lieutenant 90 / Zoony the Lazoo / Subterrain 2), John Bluthal (Commander Zero / Subterrain 1), Gerry Anderson (Robert the Robot)

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

TX (UK - ITV):
1st July 1963

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