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The submarine Seaview is commissioned to investigate the mysteries of the seas. Usually it finds more problems than answers.

In 1880s Australia, after young Jim Craig's father dies, he takes a job at the Harrison cattle ranch, where he is forced to become a man.

The Devil and the Spirit of Man argue as to whether or not humanity is ultimately good or evil.

In 1862, the British commission inventor Fergusson to claim uncharted land in West Africa for Britain by flying his giant hot air balloon there.

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.

A message is received from a US sub presumed sunk in the last months of WW2. The Seaview is sent to try and locate a cave that is mentioned in the message and to try and rescue the 5 men believed to be still alive.

The crew of the Seaview encounter Mr. Pem who can control time. Pem sends Nelson back in time to force the Admiral to let Pem use the reactor to power his device.

When four capital ships vanish, Admiral Nelson and Commander Van Wyck are sent to investigate. They find an island where Nelson removes a dagger from a skeleton which happens to be the captain of the Amsterdammer, the Flying Dutchman, and is then cursed. Van Wyck is in reality the first mate who killed the Captain. His plan is to kill Nelson with the dagger so that he can be free and Nelson will take his place.

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.

An alien being, capable of impersonating any member of the crew, gets on board the Seaview. He plans to use the Seaview's missiles to start a nuclear war and thereby make the Earth ready for conquest.

While operating over the remains of a sunken 16th century pirate ship, the Seaview encounters a reincarnation of its dead captain.

While trying to find the cause of some underwater pressure blasts, the Seaview encounters a race of Amphibians and Kowalski is transformed into one of them.

The Seaview rescues two men apparently lost at sea. They are actually escaped prisoners who try to take over the Seaview. The situation is complicated by the presence of a giant sea monster attacking the ship.

Space aliens led by an entity which takes the form of a deceased WW2 officer acquaintance of Nelson's invade the Seaview, intending to reactivate an underwater atomic base to acquire its energy.

An emergency mission leads the Seaview to rescue Kowalski's brother Stan. Once on board, Stan's refusal to help anyone else threatens the sub's survival after it sinks to the ocean floor, a thousand feet below it's crush limit.

The Seaview encounters a strange structure on the sea floor. Investigating they discover a German submarine from WW2. Surviving Germans on-board think the war is still being fought. And they have weapons on-board of unimaginable destructive power.

Crane and the Admiral are on a mission to secure a new element that could be used to control the world. While exploring an undersea cave events occur that leave the admiral as the only survivor of the expedition and a changed man.

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.

The Seaview is following up reports of a strange island being sighted when it discovers a strange egg on the ocean floor. Everyone is puzzled and excited by the find until it hatches on board.

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.

Captain Crane is in Venice to meet a secret agent when she is killed. It is believed she had knowledge of a new secret Soviet weapon, and how to combat it. Crane's mission is made more complex when he is accused of the agents death.

A scientist friend of Nelson has developed a device to control a rare white ape. The scientist's jealous assistant causes the beast to kill the scientist and the ape runs wild after being brought aboard Seaview causing destruction.

The Seaview is sent to stop an active volcano from erupting and causing a catastrophe. Accompanying them is Dr. Turner who's suppose to help them. But it turns out he has a different plan and that is to make the volcano erupt so he can acquire something that will make him immortal.

Investigating why the world's oceans are rising, the Seaview finds a race of Frost Men at the Polar Cap who are increasing the temperature and they want the submarines' reactor to help them leave the earth.

The Seaview is returning to the location of a sunken ship to recover its secret cargo. There are a number of other sunken ships in the area, and the thing responsible for all of them soon threatens the Seaview.