In exactly eleven days there will be a terrible polar earthquake. The resulting tidal wave could destroy civilization. The Seaview is dispatched for damage control. Certain enemy forces also go there to upset the Seaview's mission.

The Seaview arrives at an ocean rendezvous to pick up a Latin-American president, but the ship it meets is empty.

A scientist on a research facility in Antarctica discovers a new form of sea plankton that turns monstrously large and aggressive if exposed to heat. After the scientist mysteriously disappears, the Seaview is sent in to investigate.

A lone survivor of a doomed Antarctic expedition is rescued. The Seaview takes him and a women photographer to see if there really is a dinosaur laden tropical paradise somewhere in the Antarctic.

A very important Soviet official is defecting to the USA with his daughter. They are scheduled to be picked up in Indonesia by the Seaview. On the last leg of their escape, the official is wounded and the daughter is captured. With the official recovering in the sick bay, the Seaview now must either leave the daughter behind or make a rescue attempt. Time is running out, and dangerous agents are snooping around everywhere.

Admiral Nelson is kidnapped by a group of German survivors of WW II who dream of establishing the Fourth Reich. They plan to use Nelson, along with a group of other kidnapped scientists, to bring this about.

Admiral Nelson is aboard a new submarine when it is destroyed by a giant jellyfish. Nelson and the first officer are the only survivors. The two men begin a desperate battle for survival while being presumed lost at sea by the navy.

The Seaview is on exercises when a series of signals are received indicating the USA is at war and they are to prepare for launch of all missiles.

An undersea earthquake exhumes hundreds of strange metallic capsules, and a powerful humanoid creature who could destroy mankind is restored to life after millions of years in suspended animation.

The Seaview is tasked with recovering a returned deep space probe. On board the probe is a robot as sophisticated as a man, and capable of experiencing everything a human can.

The Seaview is seized by a man calling himself the "Buccaneer. As audacious as his plan is, it is only a small piece in a much larger plan.

The Seaview is selected to be converted to a totally automatic ship controlled by a central computer. The mission goes well till Capt. Crane, the only person aboard the sub, realizes he may not be as alone as he thought.

Crane is brainwashed to sabotage an important national defense mission which is being monitored by the national intelligence agency.

The Seaview is sent on a mission that will take into to some of the most dangerous waters in the world for submarines. Adding to the tension one of the officers lost an elder brother on a similar mission years before.

The premier of the "People's Republic", with some very valuable information, wants to defect to the US. The Seaview is sent to pick him up, but Nelson must first evaluate the information before deciding if the mission worth the risk.

When a missile is destroyed by apparent ultrasonic sound, the Seaview investigates with Adams, the mentally unstable launch commander, on board and finds an giant manta ray source which along with Adams' actions pose a threat to safety.

The Seaview is sent to investigate the wreck of the submarine Angler. They uncover evidence of strange behavior minutes before the loss, and Nelson sees this change in behavior as the secret to unlocking what happened to the Angler.

Nelson is to meet a scientist working on a secret project at Loch Ness. When he arrives he discovers the scientist is dead. A series of strange events leads Nelson to believe there may be a way for a submarine to enter the Loch.

Admiral Nelson is deeply concerned when he hears his sister has been kidnapped. He soon discovers she was not the real target and he is being placed in a position to have to go against everything he ever stood for.