Stingray - Season 1 - Eps 31: Trapped in the Depths
Atlanta is taken captive by the crazed professor Cordo who rules a race of innocent underwater people. When Stingray arrives at his undersea farm he decoys Troy and Phones into a mock-up of Stingray while his subjects take command of the real craft and head for Marineville. Troy and Phones manage to overpower the professor in time to force him to recall Stingray before the creatures can launch their attack.
About Stingray

Title: Stingray
First Air Date: 1964-10-04
Last Air Date: 1965-07-04
Status: Ended
Rating: 6.8/10 (from 17 votes)
Language: EN
Seasons: 2
Total Episodes: 40
Network: Associated Television
Genres: Action & Adventure, Sci-Fi & Fantasy
Production Companies: AP Films (APF), ITC Entertainment
Synopsis
A British children's Supermarionation television series.
Cast

Lois Maxwell
Lt Atlantis Shore

Don Mason
Captain Troy Tempest

Ray Barrett
Commander Sam Shore

Robert Easton
Lieutenant George Lee Sheridan