Space Patrol - Season 3 - Eps 13: The Shrinking Gas Of Jupiter
On a mission to Jupiter, Slim disappears in the swamps. Raeburn orders Dart and Husky to leave but trouble with the Galasphere's primary drives gives Dart an excuse to resume the search only to find that Slim has shrunk to dwarf-like proportions
About Space Patrol

Title: Space Patrol
First Air Date: 1963-04-07
Last Air Date: 1964-06-11
Status: Ended
Rating: 6/10 (from 1 votes)
Language: EN
Seasons: 3
Total Episodes: 39
Network: Unknown
Genres: Action & Adventure, Animation, Family, Sci-Fi & Fantasy
Production Companies: Unknown
Synopsis
Space Patrol is a science-fiction television series featuring marionettes that was produced in the United Kingdom in 1962 and broadcast beginning in 1963. It was written and produced by Roberta Leigh in association with the Associated British Corporation.
Cast

Ronnie Stevens
Slim / Husky / Prof. Haggarty (voice)

Dick Vosburgh
Capt. Larry Dart (voice)

Murray Kash
Col. Raeburn (voice)

Libby Morris
Marla (voice)

Ysanne Churchman
Marla / Cassiopeia (voice)