Seasons & Episodes
Melt Down
Schubert threatens to cause worldwide flooding by using powerful microwaves to melt Earth's polar ice caps, unless the g
The Mudworm
When a multimillion-dollar underwater probe malfunctions and begins attacking any ship that travels near it, Mark must r
The Hawk of Mu
Mark, investigating a power outage, discovers a centuries-old hawk statue from the legendary civilization of Mu. The sta
Giant
The oceans are leaking through a fissure in the ocean floor. A con-man named Muldoon agrees to guide Mark through the fi
Man O' War
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion deman
Shoot-Out at Land's End
Mark is somehow linked with a man named Billy, existing in a wild west town, who appears to be his twin. Investigating,
Crystal Water, Sudden Death
Schubert attempts to make a satellite weapon to knock out Earth's communications. However, to power the weapon, he needs
The Naked Montague
An underwater landslide transports Mark to Verona, Italy...in the days of Romeo and Juliet.
C.W. Hyde
C. W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.
Scavenger Hunt
Mark re-encounters Muldoon, his nemesis from "Giant," who is using a sea monster to make island natives sacrifice young
Imp
An impish little man enters an underwater station and causes the crew to become irrational simply by touching them. Afte
The Siren
While investigating the mysterious loss of three ships in one part of the ocean, Mark and the crew of the Cetacean encou
Deadly Carnival
Mark goes undercover to investigate members of a carnival planning to break into a museum. The only way to break into th
Popular Cast
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