Cast : Bradford Dillman (Paul Grogan); Heather Menzies (Maggie McKeown); Kevin McCarthy (Dr. Robert Hoak); Keenan Wynn (Jack); Dick Miller (Buck Gardner); Barbara Steele (Dr. Mengers); Belinda Balaski (Betsy); Melody Thomas Scott (Laura Dickinson); Bruce Gordon (Colonel Flaxman); Barry Brown (Trooper); Paul Bartel (Dumont);  Shannon Collins (Suzie Grogan); Shawn Nelson (Whitney); Richard Deacon (Earl Lyon); Janie Squire (Barbara Randolph); Roger Richman (David); Bill Smillie (Jail Deputy); Guich Koock (TV Commercial Announcer); Jack Pauleson (Boy in Canoe); Eric Henshaw (Father in Canoe); Robert Vinson (Soldier); Virginia Dunnam (Girl); Hill Farnsworth (Water-skier); Bruce Paul Barbour (Man in Boat); Robyn Ray (Screaming Woman); Mike Sullivan (Dam Guard); Jack Cardwell (Brandy); Sally Bondi (Swimming Deb); John Sayles (Army Sentry)

Directed by Joe Dante; Writing credits: Richard Robinson (story), John Sayles (story/screenplay); Produced by Roger Corman (executive), Jeff Schechtman (executive);  Jon Davison, Chako van Leeuwen; Original music by Pino Donaggio, Natale Massara (conductor); Cinematography by Jamie Anderson; Film Editing by Joe Dante, Mark Goldblatt; Casting: Susan Arnold; Art Direction: Bill Mellin, Kerry Mellin; Set Decoration: Jeff Ayers; Makeup Department: Rob Bottin (special makeup), Vincent Prentice (special makeup); Production Management: Thomas M. Hammel (unit production manager), Tom Jacobson (production manager); Assistant Director: Charles H. Eglee, Greg Gears; Sound Department: Richard L. Anderson (sound effects), Terry Eckton (sound effects), David Lewis Yewdall (sound effets), Anthony Santa Croce (boom operator); Kendrick Sweet (dialogue editor),  Velcie Yewdall (foley artist), Joel Goldsmith (location sound mixer); Special Effects: Jon Berg (special effects), Douglas Barnett (mechanical effects), Chris Casday (mechanical effects), Dave Morton (mechanical effects), Adam Beckett (animator), Chris Walas (armatures), Rob Bottin (model maker), Bill Hedge (photographic effects), Peter Kuran (photographic effects), Rick taylor (photographic effects), Pat O'Neill (special optical effects), Jerome Seven (effects assitant), Jules Tippett (model construction),  Phil Tippett (model construction/creature design/creature animation), Rocert Short (armatures); Stunts: Conrad E. Palmisano (stunt co-ordinator), Roger Creed (stunts), Nick Palmisano (stunts), Bobby Sargent (stunts); Best Boy: Daniel Adams; Assitant editor:  Brenda Balanda, Stacy Russo; Still Phtographer: Ted Boehler, O. C. Perkins; Production assitant:  Jim Boni, Robert Brown; Grip; Chris Brightman, Bill Decker, Michael Goldson; Key Grip: Ben Haller; Unit Grip: Scot Buttfield, Moshe Levine; Underwater grip: Eric Stoner, Lynn Troupe; Assitant Camerman: Dana Christiansen, Andy Lamarca; Unit Assitant camerman: Clyde E. Bryan, Christopher Tufty; Wardrobe supervisor: Linda Pearl; Wardrobe assitant: Jack Buehler; Dog Wrangler:  William Decker; Assitant Art director:  Tim Doughten; Driver: Michael Goldson; Unit cinematographer: M. Todd Henry; Boat Captain: Jack Hicks; Production assitant: Jeffrey M. Hoffman, Michael Martin, Ed Tarbutton; Property Master: Kevin Hughes, Kathleen Hughes; Location auditor: Nava Jacoby; Co-ordinator/Los Angeles: David Kayler; Unit Director: Dick Lowry; Background Director: Costa Mantis; Production secretary: Sharron Reynolds, Ashley Stieglitz; Script supervisor: Jeanne Rosenberg; Location Manger: Harry Wowchuk

• Production Companies: New World Pictures, New World Video

• Distributors: New World Pictures; New World Video

• Post-production sound: Ryder Sound Services

• Runtime: USA 94 / Germany 90

• Country: USA

• Language: English

• Color: Color

• Sound Mix: Mono

• Certification: USA:R / UK:18 / Germany:16 / Australia:M / Sweden:15 / Norway:18 / France:-12

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