While investigating an underwater volcano, Mark is stricken with sudden pain in the shoulder. This is not the first time he's felt pain for no reason, and his instincts lead him to a deserted beach and, inexplicably, to a frontier town of...
Aired: Sep 22, 1977A water-breathing human, the sole survivor of an underwater civilization call...
Aired: Oct 13, 1977A human scientist capable of living underwater discovers similar alien life i...
Aired: Oct 18, 1977The Cetacean is called upon to recover a space probe that crashes in the sea,...
Aired: Oct 25, 1977Elizabeth is kidnapped, one of dozens of scientists held prisoner on the isla...
Aired: Nov 1, 1977Water levels are rising all over the Earth. Mr. Schubert offers to stop the d...
Aired: Nov 8, 1977Ships are being damaged by an unknown agent hidden at a depth impossible for ...
Aired: Nov 22, 1977Schubert's tracking of a mysterious power source causes a blackout, at the ce...
Aired: Dec 6, 1977The world is endangered when a vortex opens in the ocean, and Mark must find ...
Aired: Dec 13, 1977Strapped for cash from his many expensive bids for world domination, Schubert...
Aired: Apr 18, 1978While investigating an underwater volcano, Mark is stricken with sudden pain ...
11. Crystal Water, Sudden Death
Aired: Apr 25, 1978The Cetacean finds an underwater forcefield, which shelters a race of air-bre...
Aired: May 2, 1978When a sea quake opens a fissure and Mark investigates, he finds himself in t...
Aired: Jun 6, 1978An enzyme from a rock fossil Mark finds on the sea floor with the properties ...
Main Cast
Guest Starring
Current Status: Ended
Network: NBC
Production Country: United States
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