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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 ChaseSteward- Larry HudsonState Trooper
Ricou BrowningThe Gill Man (in water)(sem créditos)
Don MegowanThe Gill Man (on land)(sem créditos)
George SowardsRanch Hand (sem créditos)