In the next episode, Mark takes drastic measures to prevent a genetically modified jellyfish named Poobah from disrupting a swim meet.
Aired: Sep 22, 1977A survivor from the lost city of Atlantis resurfaces, struggling to adapt to ...
Aired: Oct 13, 1977A marine scientist's world is shattered after uncovering the shocking truth t...
Aired: Oct 18, 1977A space probe crashes into the ocean, and the Cetacean team, led by Mark, qui...
Aired: Oct 25, 1977The next episode sees Elizabeth being whisked away to the enigmatic island of...
Aired: Nov 1, 1977A catastrophic rise in global water levels is underway, as Mr. Schubert offer...
Aired: Nov 8, 1977A mysterious threat lurks deep beneath the Navy's fleet, while the Cetacean's...
7. Crystal Water, Sudden Death
Aired: Nov 22, 1977A sudden citywide blackout sets the stage for a thrilling adventure as Schube...
Aired: Dec 6, 1977A catastrophic underwater vortex threatens the planet's water supply, prompti...
Aired: Dec 13, 1977In the next episode, Mark takes drastic measures to prevent a genetically mod...
Aired: Apr 18, 1978Mark's search for answers beneath the ocean's surface takes an unexpected det...
Aired: Apr 25, 1978A mysterious underwater forcefield uncovers a hidden world where air-breathin...
Aired: May 2, 1978A sudden seaquake unleashes a hidden fissure, transporting Mark to the world ...
Aired: Jun 6, 1978Accidental ingestion of a mysterious enzyme from a rock fossil leads to chaos...
