Season 1
(1977)
Cast
as Mark Harris
as Dr. Elizabeth Merrill
as Dr. Crawford
as Jane
Episodes
Melt Down 0.0
September 22, 1977
Schubert threatens to cause worldwide flooding by using powerful microwaves to melt Earth's polar ice caps, unless the …
The Mudworm 0.0
October 13, 1977
When a multimillion-dollar underwater probe malfunctions and begins attacking any ship that travels near it, Mark must …
The Hawk of Mu 0.0
October 18, 1977
Mark, investigating a power outage, discovers a centuries-old hawk statue from the legendary civilization of Mu. The st…
Giant 0.0
October 25, 1977
The oceans are leaking through a fissure in the ocean floor. A con-man named Muldoon agrees to guide Mark through the f…
Man O' War 0.0
November 1, 1977
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion dema…
Shoot-Out at Land's End 0.0
November 8, 1977
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 0.0
November 22, 1977
Schubert attempts to make a satellite weapon to knock out Earth's communications. However, to power the weapon, he need…
The Naked Montague 0.0
December 6, 1977
An underwater landslide transports Mark to Verona, Italy...in the days of Romeo and Juliet.
C.W. Hyde 0.0
December 13, 1977
C. W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.
Scavenger Hunt 0.0
April 18, 1978
Mark re-encounters Muldoon, his nemesis from "Giant," who is using a sea monster to make island natives sacrifice young…
Imp 0.0
April 25, 1978
An impish little man enters an underwater station and causes the crew to become irrational simply by touching them. Aft…
The Siren 0.0
May 2, 1978
While investigating the mysterious loss of three ships in one part of the ocean, Mark and the crew of the Cetacean enco…
Deadly Carnival 6.5
June 6, 1978
Mark goes undercover to investigate members of a carnival planning to break into a museum. The only way to break into t…