Shore takes up Admiral Denver's challenge that the WASP's of today can't take the rigours of an old-time sailing vessel. Phones and Lt. Fisher are assigned to Denver's crew. When a storm hits, Denver is knocked out and loses his memory and Phones and Fisher are cast adrift in a small dinghy. They are rescued by Troy who has been following in Stingray but, when Stingray approaches the sail boat, Denver begins firing his guns wildly at the sub. Troy, however, succeeds in overpowering Denver who later regains his memory in hospital.

Disaster strikes when a pilot on approach to a new airfield crashes because the light of a closed lighthouse mysteriously comes on again, confusing the pilot. When the old lighthouse keeper returns to investigate, he is captured by an alien race who use the lighthouse's power to provide energy for their city. It takes the crew of Stingray th free the keeper and see to the survival of the city.

The Solistan's want to take over the world by destroying the west coast of the USA with their attack sub.(big gun 1) Stingray destroys the sub before it can do any damage. Hungry for revenge, the Solistan's want to destroy Marineville so they launch Big Gun 2. Marineville survives & Stingray follows it back to it's deep sea base & with Marina's help they destroy the Solistan's.

After a man found in a coma is brought into Marineville, the staff are soon found in a trance like state. Can this be connected with the man?

The Stingray crew is captured when aliens set up a trap at a weather station. During what appears routine questioning, they unsuspectingly give away vital secrets about Marineville. While Stingray is on patrol, the base is attacked from below. The Invaders are unaware that Troy is aware of the invasion and they are taken by surprise when Stingray comes to the rescue.

Shore gets off on the wrong foot with Professor Burgoyne, the 'boffin' sent to Marineville to develop the new super missile needed to destroy an indestructable craft heading toward Marineville. The Professor is presumed dead when his lab explodes but he calmly reappears to announce the success of his work. Armed with the new super missile, Stingray sets off to destroy the enemy sub.

Following the escape of his slave Marina, Titan plots revenge by planning to kill the Stingray crew with a deadly plant that gives off toxic fumes. Meanwhile, Marina is feeling homesick.