'Mystery of the TA2' by Dennis Spooner

The crew of Fireball XL5 comes across the remains of the TA2, a ship that disappeared over fifty years ago. Having determined the course that the ship’s captain, Colonel Harry Denton, was taking, Professor Matic, Steve, Venus and Robert follow the trail and find clues that indicate that Denton took an escape capsule down to the surface of the planet Arctan. The XL5 crew investigate, and after surviving various deadly pitfalls, they find Denton living happily as king of the planet's Ice People…

Paul Maxwell (Colonel Steve Zodiac), Sylvia Anderson (Doctor Venus), David Graham (Professor Matt Matic / Lieutenant 90 / Zoony the Lazoon / Jinco), John Bluthal (Commander Zero / Colonel Harry Denton / Second Iceman), Gerry Anderson (Robert the Robot)

Directed by John Kelly
Produced by Gerry Anderson
Associate Producer Reg Hill

TX (UK - ITV):
26th August 1963

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