'The Last of the Zanadus' by Anthony Marriott

The evil Kudos, last inhabitant of the planet Zanadu, hatches a plan to destroy all Lazoons by infecting Major Jim Island of Space City with a deadly bacterium. Under Kudos’ influence, Island returns to Earth after ten years and attends a welcome home party thrown by Steve Zodiac and Venus, where he infects a quantity of Zoonie’s favourite dish, Martian Delight. When Venus unwittingly gives Zoonie the dish, the Lazoon becomes very ill; Steve needs to fly to Zanadu to obtain the antidote – but then Island steals Fireball XL5…

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

Directed by Alan Pattillo
Produced by Gerry Anderson
Associate Producer Reg Hill

TX (UK - ITV):
10th June 1963

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