'The Invaders' by Dennis Spooner

When aliens set a trap at a trap at a weather station, they manage to capture the crew of Stingray. Troy and Phones are then tricked into giving away vital secrets about Marineville’s security, which the aliens promptly use to mount an attack on the WASP base from below…

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), David Graham (Oink)

Directed by David Elliott
Produced by Gerry Anderson

TX (UK): 18th April 1965

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