'The Golden Sea' by Dennis Spooner

The Stingray crew are assigned to make monthly visits to Professor Darren and his team, who have developed a method for making gold from minerals taken from the sea bed. When Surface Agent X20 learns of this he informs his master, Titan, who sees an opportunity to destroy his enemies once and for all. Placing a sounding device on the hull of the professor’s bathysphere, Titan despatches a giant killer swordfish to destroy both the ‘sphere and Stingray...

Don Mason (Captain Troy Tempest), Robert Easton (Lieutenant George Lee ‘Phones’ Sheridan / Agent X20), Lois Maxwell (Lieutenant Atlanta Shore), Ray Barrett (Commander Sam Shore / Lieutenant Fisher / Titan)

Directed by John Kelly
Produced by Gerry Anderson

TX (UK): 6th June 1965

Notes:
*Featuring Captain Troy Tempest, Lieutenant George Lee 'Phones' Sheridan, Commander Sam Shore, Lieutenant Atlanta Shore, Lieutenant Fisher and Marina