Atlantis survivor Mark Harris breathes underwater, withstands extreme depth pressures and wields superhuman strength.
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Air Date: 1977-09-22
Schubert threatens to cause worldwide flooding by using powerful microwaves to melt Earth's polar ice caps, unless th...
Air Date: 1977-10-13
When a multimillion-dollar underwater probe malfunctions and begins attacking any ship that travels near it, Mark mus...
Air Date: 1977-10-18
Mark, investigating a power outage, discovers a centuries-old hawk statue from the legendary civilization of Mu. The ...
Air Date: 1977-10-25
The oceans are leaking through a fissure in the ocean floor. A con-man named Muldoon agrees to guide Mark through the...
Air Date: 1977-11-01
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion de...
Air Date: 1977-11-08
Mark is somehow linked with a man named Billy, existing in a wild west town, who appears to be his twin. Investigatin...
Air Date: 1977-11-22
Schubert attempts to make a satellite weapon to knock out Earth's communications. However, to power the weapon, he ne...
Air Date: 1977-12-06
An underwater landslide transports Mark to Verona, Italy...in the days of Romeo and Juliet.
Air Date: 1977-12-13
C. W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.
Air Date: 1978-04-18
Mark re-encounters Muldoon, his nemesis from "Giant," who is using a sea monster to make island natives sacrifice you...
Air Date: 1978-04-25
An impish little man enters an underwater station and causes the crew to become irrational simply by touching them. A...
Air Date: 1978-05-02
While investigating the mysterious loss of three ships in one part of the ocean, Mark and the crew of the Cetacean en...
Air Date: 1978-06-06
Mark goes undercover to investigate members of a carnival planning to break into a museum. The only way to break into...