A massive prehistoric crocodile is released from its icy tomb when extensive undersea farming and mining cause the temperature of the South Atlantic to rise.

When his plane crashes in the South American jungle, Piccolo is kidnapped by a ruthless dictator who he finds out has secretly been creating artificial life forms that have now gone out of control.

The seaQuest is captured by an alien spacecraft and taken to Hyperion, a completely aquatic planet.

The crew is then drawn into the civil war between the KrayTaks and the Hyperion resistance.

Ten years after its mysterious disappearance, the seaQuest appears back on Earth.

A tough Navy officer, who had been obsessed with searching for the submarine, assumes command of the seaQuest due to the new hostile world climate.

Hudson must relieve his old commanding officer from duty onboard a heavily armed underwater base after the base fires on Macronesia.

Lucas must face up to Bridger over his potentially risky solution to combat an organism that threatens to reach epidemic proportions.

SeaQuest docks at a penal colony where the prisoners are enslaved.

Henderson recognizes one and inadvertently causes a riot allowing the inmates to escape and take hostages.