The Stingray crew track the launch site of missiles fired on Marineville to a volcanic island. However, on investigating they become captured by the aliens responsible.

Commander Shore and Phones are taken prisoner by Idotee who uses an old Spanish galleon to attack ships. Shore demands that Troy launch Sting Missiles against the galleon but the Captain disobeys orders and boards the vessel. There he opens his air cyclinders in the control room but unknown to Idotee the cylinders are filled with laughing gas! The alien is laughing so hard he fails to realise that he's captured

When their vacation is cancelled, the Stingray crew probes into the ocean depths, They discover a deep shaft that leads to desert-like plateaus. Before they can complete their investigation, a wall of water turns the desert into an underground sea. Swimming desperately back to Stingray they attempt to relocate the shaft before their oxygen runs out. Out of desperation they enter the first shaft they see. They surface near a beautiful tropical island. The perfect place for a holiday

Troy locks horns with the boastful Naval Captain who arrives in Marineville to demonstrate a new missile. X20, however, loads the test missile with real explosives and it appears that the Naval Captain is actually out to kill Troy. Shore is ready to Court Martial the Captain until Troy proves the interference of Titan's subjects.

While the Stingray crew go to the rescue of two crazy treasure hunters, Troy falls down a crevasse, runs out of air and goes into unconsciousness. When he comes to, he discovers he doesn't need breathing equipment to breathe and he is now the richest man in the world.

Thinking all the commotion at Marineville signals the visit of a VIP, X20 kidnaps the man and delivers him to Titan. The undersea ruler is surprised to learn that X20 has brought Duke Dexter, a pop singer. Titan is convinced that Dexter is an ally of the underwater people by the way he drives the Terraneans crazy with the weird noises he emits. Dexter is freed by Titan to continue his 'good work'.

X20 has planted a bomb in the bass fiddle of a jazz group that will give a concert at the undersea city of Aphony, Marina's father. Troy uncovers the plot but is trapped in a burning shack. He escapes just in time and races to Pacifica in Stingray in an attempt to save the lives of his friends.

Commander Shore keeps having nightmares when he was crippled in a sea battle with an underwater craft five years ago and rescued by a mysterious stranger.

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.

While trying to decide what to wear to Atlanta's fancy dress ball, Troy falls asleep and dreams that he and Phones are pitted against a race of underwater cavemen who plunder the cargo of a vessel varrying radioactive material. Troy awakens from his adventure, inspired to wear a caveman outfit to the ball - as, in fact, does everyone else!

Investigating the disappearance of a robot probe, Stingray is drawn to the bottom of a volcano where two survivors of a destroyed city attempt to steal Stingray to escape the erupting volcano. When Marina locks the hatch they are forced to return for Troy and Phones who have been left to die. Since there are only two sets of breathing gear, Troy and Phones must rely on their WASP training to make the swim to Stingray.

Eastern despot El Hudat wants to become a member of the WASPs. Just as he is about to join up, there is a revolt in his country and he is ousted from power. Angered, he blames the WASPs. El Hudat has an interest in Marina, so the dictator kidnaps her and takes her aboard his yacht causing the Stingray crew to save her.

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?

While awaiting orders for a mission, Troy falls asleep. When he awakes, the Stingray crew are sent on the mission. Soon, they find themselves in a fish tank in a dining hall. The crew have shrunk! Titan and some underwater races have stolen plans for Marineville. Troy manages to call Commander Shore who doesn't believe their story, so the Stingray crew must come up with a plan to destroy the Marineville plans.

The de-throned Ali Khali, brother of evil dictator El Hudat (who is in Marineville Jail) visits Marineville. Meanwhile, Surface Agent X20 helps El Hudat to escape from his imprisonment by swapping Ali Khali, who has an exact likeness, in his place. Commander Shore discovers the switch so the Stingray crew and Ali Khali give chase.

Reports come in from all over the world about pink ice. Whilst investigating, the Stingray crew become trapped in the rapidly freezing pink water.

Troy and Phones discover a strange city of sunken ships when they search for three disused freighters that were to be blown up by remote control. The Nomads, who live in the sunken ships, are unaware of the timed explosives in their new requisitions and refuse to believe Troy. That is until one of the vessels detonates. The explosion jams the escape hatch. The second ship explodes but it is the nearby third one that could kill them. With only 10 minutes to go, they desperately manage to free the hatch and escape.

After recovering a giant oyster, two explorers are captured by Troy in restricted waters. They persuade Commander Shore to let the Stingray crew help them collect it's pearl. However, the crew are unaware of their real intentions !!

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.

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.

During a Terror Fish attack, Stingray is damaged. When Troy goes to make repairs, an Aquaphibian poisons him with some purple liquid. At Marineville, the doctors can't find a cure. Without treatment, troy will die within four hours. Titan has the antidote but will only send it exchange for Marina. Commander Shore refuses but Marina makes up her mind and returns to Titanica. Titan keeps his word and sends the antidote. Once recovered, Troy must come up with a plan to rescue Marina.

An underwater alien takes an ex-WASP admiral and his wife captive.

Commander Shore is framed when a piece of equipment disappears from Marineville control. Troy places the commander under arrest but who would want to frame the commander and why doesn't Shore protest his innocence?