Underwater

Scientists surgically transform the Creature into an air-breather, but being able to live on land is not enough to make him comfortable with humans. Enraged, he turns his wrath on anyone who comes near as he desperately tries to return to the deep-water world where he truly belongs.
Rex ReasonDr. Thomas Morgan
Jeff MorrowDr. William Barton
Leigh SnowdenMarcia Barton
Gregg PalmerJed Grant
Maurice MansonDr. Borg
James RawleyDr. Johnson
David McMahonCapt. Stanley
Paul FierroMorteno
Lillian MolieriMrs. Morteno
Frank ChaseStewardL Larry HudsonState Trooper
Ricou BrowningThe Gill Man (in water)(uncredited)Production information and reference links
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