Man from Atlantis (1977)

Schubert threatens to cause worldwide flooding by using powerful microwaves to melt Earth's polar ice caps, unless the government turns Mar…

When a multimillion-dollar underwater probe malfunctions and begins attacking any ship that travels near it, Mark must reason with its high…

Mark, investigating a power outage, discovers a centuries-old hawk statue from the legendary civilization of Mu. The statue, when used prop…

The oceans are leaking through a fissure in the ocean floor. A con-man named Muldoon agrees to guide Mark through the fissure to investigat…

Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion demands are met.

Mark is somehow linked with a man named Billy, existing in a wild west town, who appears to be his twin. Investigating, Mark arrives in the…

Schubert attempts to make a satellite weapon to knock out Earth's communications. However, to power the weapon, he needs the energy crystal…

An underwater landslide transports Mark to Verona, Italy...in the days of Romeo and Juliet.

C. W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.

Mark re-encounters Muldoon, his nemesis from "Giant," who is using a sea monster to make island natives sacrifice young girls to him.

An impish little man enters an underwater station and causes the crew to become irrational simply by touching them. After three crewmen die…

While investigating the mysterious loss of three ships in one part of the ocean, Mark and the crew of the Cetacean encounter a submarine op…

Mark goes undercover to investigate members of a carnival planning to break into a museum. The only way to break into the museum is through…