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Marshall Grauer as Dr. Kurt Leopold |
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Wade Popwell as The Monster |
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Paul Galloway as Sheriff Lou Krantz |
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Gerald Cruse as Marine Biologist Rex |
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Sanna Ringhaver as INPIT Agent Martha Walsh |
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Dave Dickerson as INPIT Agent Walker Stevens |
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Rich Valliere as Deputy Sheriff |
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Nancy Lien as Girl Camper |
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Russell Holcomb as |
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Gloria Brady as |
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Del Galloway as |
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Hal Nearhoof as |
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Jim Merrill as |
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Elizabeth Barton as Girl on Porch |
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Jim Merrill as Boy on Porch |
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Bob Knowles as |
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Carol Thompson as |
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Jack Weatherford as |
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Doug Thomas as Reporter |
| Directing | Don Barton | Director |
| Production | Don Barton | Producer |
| Production | Robert M. Smith Jr. | Associate Producer |
| Production | Dick Stratton | Associate Producer |
| Sound | Jamie DeFrates | Original Music Composer |
| Sound | Barry Hodgin | Original Music Composer |
| Costume & Make-Up | Lee J. O'Donnell | Makeup Artist |
| Production | Paul Galloway | Unit Manager |
| Editing | George J. Yarbrough | Editor |
| Visual Effects | Martha Fillyaw | Creature Design |
| Visual Effects | Ron Kivett | Creature Design |
| Visual Effects | Les Lancaster | Creature Design |
| Writing | Don Barton | Screenplay |
| Writing | Ron Kivett | Original Story |
| Writing | Lee O. Larew | Original Story |
| Camera | Jack McGowan | Director of Photography |
