Admiral Nelson wanders the Seaview and finds it abandoned except for Captain Crain and Chief Sharkey. He has no memory of what happened before or what the strange sounds ...

A controversial filmmaker's crew is killed by a creature on a remote island. The Seaview goes to investigate the incident. One of the crewmen has a special interest in th ...

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 ...

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 ...

An old man, adrift at sea, is rescued along with a sack of toys by the Seaview. The toys take on a life of their own and begin to sabotage the ship. The toys appear to be ...

The Seaview's diving bell is driven by a tsunami onto a tropical island where a mysterious mist causes the survivors to see imaginary people and creatures. ...

After the arrival of a newly elected U.S. Senator to inspect Admiral Nelson's new weapon, strange things begin to happen, culminating with the realization that everyone o ...

Scientists on a tropical island are measuring the radioactivity of a volcano when they are attacked by a wolf. Prof. Hollis shows signs of lycanthropy and threatens every ...

A strange intelligent organism is found at the bottom of the ocean. Once brought on Seaview the real threat the creature represents is realized. Suddenly every life on bo ...

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

The construction of an undersea canal is about to start with the Seaview tasked with placing the first charge, a 50 megaton nuclear bomb. But as it is being lowered an en ...

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 ...

A meteor storm ignites atmospheric gases in the southern hemisphere. Adm. Nelson believes one of the Seaview's missiles can extinguish it but someone on board is secretly ...

The Seaview finds a sunken German U-boat while mapping the ocean floor. Sunk during WWI in the north Atlantic, it is now somehow in the south Pacific. Its captain boards ...

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 ...

By air Nelson and Crane pursue a mysterious submarine stealing nuclear missiles. Their craft is shot down and Crane is captured. Nelson, recovered by a Navy destroyer, is ...

Admiral Nelson and Chief Starkey are marooned on an island with prehistoric creatures. The Seaview is trying to rescue them but they have an undersea monster of their own ...

In 1978, the first space probe to Saturn returns and the Seaview is sent to retrieve it. Despite their stringent decontamination procedures an alien life form survives an ...

Admiral Nelson is under pressure when a drone sub system he pioneered malfunctions and fires three missiles at New York City. The race is on to establish what went wrong ...

Word comes through that Dr Liscomb has been kidnapped by a foreign agent posing as a toy importer. Liscomb has cracked the secret of the X factor, a new ingredient and ev ...

A manned probe is returning to Earth when it is suddenly caught in the grip of a strange force and destroyed. Investigations point to a secret Chinese installation being ...

Nelson and the Seaview witness the detonation of a new bomb developed by the Chinese. No bigger than a milk carton it creates a blast 70 miles across. An American scienti ...

A research team are taking measurements of an underwater eruption. They discover a fissure that appears to lead all the way to the Earth's core. While the discovery is ex ...

The President of the United States is visiting a new underwater installation when a power interruption freezes all communication. To complicate the situation they discove ...

Admiral Nelson is contacted by a strange man claiming to be from the Office Of Naval Intelligence. He gives Nelson a cryptic message that Penfield is not to be allowed to ...

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 missio ...

Nelson is visiting a scientist and discovers that he has created cyborgs, human looking robots. When Nelson tries to leave, the scientists orders his cyborgs to detain hi ...

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 ...

The Chinese have developed a way to turn a human body into an intense bomb. They intend to infiltrate the Soviet Union and create a diplomatic incident that will draw the ...

Admiral Nelson and a Soviet scientist are in a diving bell when the vessel is swallowed by a giant whale. With only 90 minutes of oxygen, Captain Crane, Kowalski, and Ril ...

Plot not avaiable ...

This episode involves the testing of a new air mixture that will allow a submarine to go to the bottom of the sea literally! A brash, news hogging, admiral and his aide, ...