'The Day the Earth Froze' by Alan Fennell

Space City goes to Red Alert when Fireball XL27 approaches on a collision course and makes a crash landing. The crew are found to be in comas, and a note discovered in the pilot’s hand warns of danger on the planet Xavia. Commander Zero orders the XL5 crew to investigate the ice planet, but when Steve and Venus take Fireball Junior down to the frozen surface of Xavia, they are captured by two Icemen and thrown into an ice jail. The two aliens reveal that they will gain their revenge on Earth by using a giant disc to deflect the sun's rays, lowering the planet’s temperature and causing the planet to freeze solid…

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

Directed by David Elliott
Produced by Gerry Anderson
Associate Producer Reg Hill

TX (UK - ITV):
4th November 1963

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