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Cotter Smith as Sergeant Sam Taliaferro |
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Mel Harris as Dr. Nora Haley |
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Scott Curtis as Cameron Lansing |
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Chuck McCann as Ben Majors |
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Leigh McCloskey as Pete Groom |
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Kim Lankford as Dory Lansing |
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Gary Hudson as Bob Froelich |
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Tab Hunter as Owen Lansing |
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Dort Clark as Alan Wilson |
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David Povall as Capt. Navarro |
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Wilson Smith as Joe Crespy |
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Kerry Yo Nakagawa as Policeman |
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Raymond Patterson as Physician |
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Skip E. Lowe as Newscaster |
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Bonnie Bradigan as Newswoman |
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Frank Pesce as Ed Wallace |
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Paul W. Zecevic as Reporter |
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Doc D. Charbonneau as Little Demon |
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William Lustig as Ice Cream Eater (uncredited) |
| Directing | Armand Mastroianni | Director |
| Writing | Gary Brandner | Screenplay |
| Production | John S. Curran | Line Producer |
| Production | George Zecevic | Executive Producer |
| Production | Ann Remsen Manners | Casting |
| Editing | Frank De Palma | Editor |
| Crew | Greg Landerer | Special Effects |
| Production | Luigi Cingolani | Producer |
| Costume & Make-Up | Rose Librizzi | Makeup Artist |
| Production | Kelly Van Horn | Unit Production Manager |
| Sound | Kenneth R. Burton | Sound Recordist |
| Sound | Harry Manfredini | Original Music Composer |
| Art | Sarah Burdick Stone | Set Decoration |
| Visual Effects | Ermando Biamonte | Visual Effects Supervisor |
| Visual Effects | Carlo Rambaldi | Creature Design |
| Crew | Spiro Razatos | Stunt Coordinator |
| Production | Franc Caggiano | Associate Producer |
| Costume & Make-Up | Rose Librizzi | Prosthetic Makeup Artist |
| Camera | Russell Carpenter | Director of Photography |
| Art | Mike Bingham | Production Design |
| Sound | Ara Ashjian | Sound Recordist |
| Costume & Make-Up | Alex Rambaldi | Prosthetic Makeup Artist |
| Sound | Gregory Cheever | Sound Recordist |
| Crew | Cheryl Wheeler Duncan | Stunts |
| Camera | Paul A. Edwards | Additional Photography |
