Corpsman Mallory's 4th Dimension Machine causes Captain Crane to kill Admiral Nelson, but did he really? A hunted Crane tries to prevent the event from happening. ...

While investigating the destruction of the fleet by a flying saucer, Nelson and Kowalski are captured by aliens. One of the aliens offers help to the Seaview crew to stop ...

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' r ...

The Seaview investigates why part of the Italian coast has become overrun with jungle growth. Meanwhile new crewman Keeler has 3 miniature silver faced men grow to human ...

The Seaview and an intelligence expert who is more than he seems, try to find a group that is blackmailing the world's nations for gold bullion. The submarine encounters ...

Crane receives a Mayday from the Seaview and finds no one on board except a UFO expert. The crew re-appears and announces they are going to fire nuclear missiles at Washi ...

A lobster man arrives in a space craft claiming to be a friend but in reality he wants one of the nuclear rods to cause an explosion thus paving the way for an invasion. ...

The Seaview is sent to stop a warhead on the ocean floor from detonating. But a leprechaun wants it to go off. So he tries to stop them. But his good twin brother tries t ...

The original Blackbeard takes over some of the Seaview crew including Kowalski to blow up a ship carrying King Solomon's Golden Throne. The remaining crew try to find a w ...

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. ...

An alien plant takes over Admiral Nelson in a plan to turn the Seaview into a giant greenhouse where it can take over the world. ...

A man named Alpha from 2823 sends 2 Collectors to bring Nelson to his time to add the Admiral to his collection of military officers. Chief Sharkey goes to the future to ...

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 ...

Aliens from the planet Centaur bring a capsule containing Commander Morton to Venus. They want to keep earth from invading their planet and kidnap Captain Crane in an att ...

A puppeteer comes on board to entertain the crew. But it is later revealed that his puppets are alive and they plan to take over the sub. That's when they replace the cre ...

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 ...

The Seaview investigates a strange cloud that seems to be the source of immense destruction around the world. The world has only 24 hours to live unless Seaview can crack ...

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 unti ...

While on patrol the Seaview is attacked and badly damaged by an unknown submarine. As the crew frantically work to save the vessel and themselves an even greater menace a ...

The Seaview is tasked with attempting a space probe launch from sea. To avoid interference a skeleton crew is manning the ship. While en route the ship encounters a stran ...

While on routine patrol the Seaview begins to hear strange noises coming from an undersea canyon. Investigating they discover the source of the noise and the power behind ...

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 be ...

While on a routine scientific expedition Capt Crane encounters a strange hybrid seaweed humanoid creature. Crane is captured by the creature and the crew of Seaview launc ...

An unfriendly government shoots down a cargo plane carrying a new top secret bomb. The race is on to retrieve the bomb and avoid detection from the enemy before the bomb ...

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 bas ...

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 ...

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 ...