| Person | Type | Job | Role(s) |
|---|---|---|---|
 Chris Walas | Crew | Art | Special Props |
 Conrad E. Palmisano | Crew | Crew | Stunt Coordinator |
 Hisako Tsukuba | Crew | Production | Co-Producer |
 Jamie Anderson | Crew | Camera | Director of Photography |
Jeff Schechtman | Crew | Production | Executive Producer |
 Joe Dante | Crew | Directing | Director, Editor |
 John Sayles | Crew | Writing | Screenplay, Story |
 Jon Berg | Crew | Crew | Special Effects |
Jon Davison | Crew | Production | Producer |
 Phil Tippett | Crew | Visual Effects | Creature Design |
 Pino Donaggio | Crew | Sound | Original Music Composer |
 Rob Bottin | Crew | Costume & Make-Up | Special Effects Makeup Artist |
 Roger Corman | Crew | Production | Executive Producer |
Susan Arnold | Crew | Production | Casting |
Vincent Prentice | Crew | Costume & Make-Up | Special Effects Makeup Artist |
 Mark Goldblatt | Crew | Editing | Editor |
Robert Short | Crew | Art | Special Props |
Bill Mellin | Crew | Art | Art Direction |
Kerry Mellin | Crew | Art | Art Direction |
Jeff Ayers | Crew | Art | Set Decoration |
Richard Robinson | Crew | Writing | Story |
 Amy Holden Jones | Cast | Actress | Hertz Clerk (uncredited) |
Andrew G. La Marca | Cast | Actor | Scuba Diver #1 (uncredited) |
 Barbara Steele | Cast | Actress | Dr. Mengers |
 Barry Brown | Cast | Actor | Trooper |
 Belinda Balaski | Cast | Actress | Betsy |
Bill Smillie | Cast | Actor | Jailer |
 Bradford Dillman | Cast | Actor | Paul Grogan |
 Bruce Gordon | Cast | Actor | Colonel Waxman |
Bruce Paul Barbour | Cast | Actor | Man in Boat |
Diamond Farnsworth | Cast | Actor | Water-skier |
 Dick Miller | Cast | Actor | Buck Gardner |
 Eric Braeden | Cast | Actor | Dr. Robert Hoak (swimming double) (uncredited) |
Eric Henshaw | Cast | Actor | Father in Canoe |
 Guich Koock | Cast | Actor | TV Pitchman |
 Heather Menzies | Cast | Actress | Maggie McKeown |
Janie Squire | Cast | Actress | Barbara Randolph |
Joe Dante | Cast | Actor | Scuba Diver #2 (uncredited) |
John Sayles | Cast | Actor | Army Sentry (uncredited) |
 Keenan Wynn | Cast | Actor | Jack |
 Kevin McCarthy | Cast | Actor | Dr. Robert Hoak |
 Melody Thomas Scott | Cast | Actress | Laura Dickinson |
Mike Sullivan | Cast | Actor | Dam Guard |
 Paul Bartel | Cast | Actor | Mr. Dumont |
Phil Tippett | Cast | Actor | Scuba Diver (uncredited) |
 Richard Deacon | Cast | Actor | Earl Lyon |
Robert Vinson | Cast | Actor | Soldier |
Sally Bondi | Cast | Actress | Swimming Deb (uncredited) |
Shawn Nelson | Cast | Whitney | |
Shannon Collins | Cast | Actress | Suzie Grogan |
Roger Richman | Cast | David | |
Jack Pauleson | Cast | Actor | Boy in Canoe |
Virginia Dunnam | Cast | Actress | Girl |
Robyn Ray | Cast | Actress | Screaming Woman |
Jack Cardwell | Cast | Actor | Brandy |
| Person | Type | Job | Role(s) |
