Episode 1
Eleven Days to Zero
A gigantic tidal wave will destroy much of the civilized world, but Admiral Harriman Nelson has a plan to stop...
Episode 2
The City Beneath the Sea
While investigating the disappearance of research ships in the Aegean, the Seaview is damaged by a bomb. Capta...
Episode 3
The Fear-Makers
After Seaview's sister ship, Polidor, is lost on an experimental deep dive, Seaview continues with the tests....
Episode 4
The Mist Of Silence
On a rendezvous mission, Crane and several crewmen are drugged into unconsciousness on a deserted yacht. Wakin...
Episode 5
The Price of Doom
A husband and wife Antarctic research team is killed by an experiment on plankton gone wild. Seaview arrives t...
Episode 6
The Sky is Falling
An alien spaceship lands in the ocean, and Seaview is sent to investigate. Although Seaview is powerless in th...
Episode 7
Turn Back the Clock
A lush, tropical, verdant paradise in the South Pole? Living dinosaurs? Such fanciful ideas must surely be the...
Episode 8
The Village of Guilt
A sea monster kills three villagers in a Norwegian fjord; however, one man survives. Seaview arrives to invest...
Episode 9
Hot Line
A Soviet satellite has crashed into the sea and its nuclear reactor must be disarmed before it causes a disast...
Episode 10
Submarine Sunk Here
Damaged by an explosion from an old mine field, Seaview takes a dive to the ocean floor. Listing dangerously,...
Episode 11
The Magnus Beam
A mysterious weapon is destroying American U2s. The Seaview's mission is to find the weapon and destroy it. Ca...
Episode 12
No Way Out
Nelson and Crane go undercover and risk their lives in order to bring a Communist defector back to the United...
Episode 13
The Blizzard Makers
In blizzard-wracked Florida, Nelson contacts a meteorologist who may be able to help explain the strange weath...
Episode 14
The Ghost of Moby Dick
An old friend of Nelson's comes aboard Seaview to continue his research into the giant whale that destroyed hi...
Episode 15
Long Live the King
When the King of a small but friendly nation is assassinated, Seaview is assigned to take the young Crown Prin...
Episode 16
Hail to the Chief
Injured in a fall, the President of the United States is in desperate need of surgery -- and the operation mus...
Episode 17
The Last Battle
Admiral Nelson is kidnapped from a plane during mid-flight and held on a remote island by Nazis who plan to co...
Episode 18
Mutiny
After Nelson's experimental submarine is attacked by a giant jellyfish, tension mounts aboard the Seaview as N...
Episode 19
Doomsday
When a mass missile launching by a foreign power sets the U.S. on nuclear alert, the Seaview goes into a fail-...
Episode 20
The Invaders
An undersea earthquake exhumes hundreds of strange metallic capsules, and a powerful humanoid creature who cou...
Episode 21
The Indestructible Man
After returning from a mission on deep space, a lifelike robot is brought aboard the Seaview, but the crew soo...
Episode 22
The Buccaneer
A mad art connoisseur seizes control of the Seaview and plans to pirate Leonardo da Vinci's Mona Lisa from a F...
Episode 23
The Human Computer
A newly installed super-computer is tested on the Seaview...but the enemy has other plans.
Episode 24
The Saboteur
Crane is brainwashed by enemy agents, and his new mission is to deactivate certain strategic undersea missiles...
Episode 25
Cradle of the Deep
A strange experiment to speed up evolution goes horribly awry, and an enormous protoplasm monster threatens th...
Episode 26
The Amphibians
The cre of the Seaview is called to investigate an undersea laboratory where scientists are surgically transfo...
Episode 27
The Exile
Nelson is stranded aboard a life raft with the ex-premier of a hostile foreign power who carries vital informa...
Episode 28
The Creature
The crew is joined by Captain Adams, the sole survivor of an ill-fated missile launch, in search of the myster...
Episode 29
The Enemies
Nelson and Crane hear about the destruction of the submarine Angler. When they read the captain's log and hear...
Episode 30
The Secret of the Loch
The Seaview travels to Scotland via a secret, underground conduit to investigate the mystery of the legendary...
Episode 31
The Condemned
Nelson and Crane are dismayed when an egotistical, publicity-seeking scientist is given command of the Seaview...
Episode 32
The Traitor
Nelson's sister is abducted by enemy agents who demand top-secret information as ransom, but will Nelson betra...