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Pilot Episode. An earthquake set to happen in the Arctic will send a huge wall of water that will destroy the coastal regions of half the world. Admiral Nelson and the Seaview race to the North Pole with a plan to stop it.

The Seaview investigates when two research ships are destroyed in the Aegean Sea. Captain Crane discovers an underwater city that may be the cause.

An enemy agent uses a "fear gas" to panic Admiral Nelson and the crew of the Seaview before they are to make a dangerous deep-trench dive.

The Seaview is sent on a mission to help the president of a Latin American country defect. Captain Crane and some crew members are captured by a corrupt military official and Admiral Nelson leads a rescue team to free them.

The Seaview travels to Antarctica, where research into using plankton as a major food source has gone horribly wrong.

A flying saucer crash-lands in the Pacific. The military wants to destroy it, but Admiral Nelson investigates and decides to help the aliens repair their ship.

A South Pole research team is lost when the cable on their diving bell breaks. A survivor is picked up nine months later, babbling about a tropical oasis populated by prehistoric monsters. Seaview travels to Antarctica in search of the truth.

Admiral Nelson orders the Seaview to Norway after hearing reports of a giant sea monster. Once there, Nelson suspects that the monster may be the result of a scientific experiment gone wild.

A Soviet atomic satellite launch goes wrong, and the missle is set to crash in the Pacific about fifty miles from San Francisco. The Seaview must transport two Russian scientists to deactivate the missle's nuclear reactor before it blows up.

The Seaview stumbles into a derelict minefield and is seriously damaged.

Captain Crane goes undercover inside an enemy country to find out why American U-2 spy planes have been crashing.

A defecting communist spy is badly wounded while making his escape. Getting him aboard the Seaview doesn't stop the attempts on his life.

Summer snowstorms and freezing temperatures have gripped the east coast of the United States. Admiral Nelson seeks the help of a leading climatologist, unaware that the scientist has been programmed to stop Nelson at any cost.

A scientist enlists Admiral Nelson and the Seaview to help him locate a gigantic whale. It's not research the scientist has in mind, but revenge!

The State Department asks Admiral Nelson to transport a young prince back to his homeland so that he may assume the throne. While on the lookout for enemy ships, the Seaview picks up an old man adrift at sea. The mysterious castaway has a few lessons to teach the future king.

The President is scheduled to attend a major summit meeting in Geneva when he suffers a severe head injury. For security reasons, medical treatment must occur aboard the Seaview. An enemy agent infiltrates the submarine to make sure the President never leaves Seaview alive.

Admiral Nelson is kidnapped by Nazis intent on creating a Fourth Reich.

Admiral Nelson is helping out aboard the submarine Neptune during its shakedown cruise when a huge jellyfish attacks and destroys the sub. Nelson survives and begins to act erratically when he returns to the scene with Seaview.

The Seaview's missile officer balks at doing his job when the sub goes into fail-safe mode.

An undersea quake uncovers the remains of an ancient civilization and numerous metallic pods containing human-like beings in a state of suspended animation.

A robot-probe sent on a mission to deep space returns to earth and is picked up by the Seaview.

A modern-day buccaneer and his gang hijack the Seaview to help them steal the greatest art treasure in the world.

A powerful computer is put in control of the Seaview, with only Captain Crane on board to observe. Crane begins to suspect that he may not be alone.

Captain Crane is brainwashed by an enemy power and ordered to sabotage the Seaview's latest mission.

An experiment to try and speed up the process of evolution puts the Seaview in grave danger.

Two scientists working in an undersea laboratory ignore Admiral Nelson's warning about experimenting on humans.

Admiral Nelson is ordered to secretly meet with the recently deposed leader of a hostile country and evaluate the information he is offering to Washington in exchange for asylum. Nelson ends up stranded on a life raft with the ex-leader and certain members of his inner cicle.

The Seaview investigates the source of ultrasonic sound waves that destroyed a missile launch and finds a gigantic manta ray may be responsible.

While investigating the unexplained destruction of the submarine Angler, Nelson and Crane are captured and subjected to an experiment that turns natural friends into mortal enemies.

The Seaview travels to Scotland, where Admiral Nelson must deliver important information to a top secret laboratory at Loch Ness -- home of the legendary Loch Ness Monster!

A publicity-seeking admiral will stop at nothing to ensure the success of his pressure system experiment.