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 Waxman
Barry Brown
Trooper
Paul Bartel
Mr. Dumont
Shannon Collins
Suzie Grogan
Shawn Nelson
Whitney
Richard Deacon
Earl Lyon
Janie Squire
Barbara Randolph
Roger Richman
David
Bill Smillie
Jailer
Guich Koock
TV Pitchman
Jack Pauleson
Boy in Canoe
Eric Henshaw
Father in Canoe
Robert Vinson
Soldier
Virginia Dunnam
Girl
Diamond Farnsworth
Water-skier
Bruce Paul Barbour
Man in Boat
Robyn Ray
Screaming Woman
Mike Sullivan
Dam Guard
Jack Cardwell
Brandy
Sally Bondi
Swimming Deb (uncredited)
Eric Braeden
Dr. Robert Hoak (swimming double) (uncredited)
Joe Dante
Scuba Diver #2 (uncredited)
Amy Holden Jones
Hertz Clerk (uncredited)
Andrew G. La Marca
Scuba Diver #1 (uncredited)
John Sayles
Army Sentry (uncredited)
Phil Tippett
Scuba Diver (uncredited)
Bill Mellin
Art Direction
Kerry Mellin
Jeff Ayers
Set Decoration
Chris Walas
Special Props
Robert Short
Jamie Anderson
Director of Photography
Rob Bottin
Special Effects Makeup Artist
Vincent Prentice
Jon Berg
Special Effects
Conrad E. Palmisano
Stunt Coordinator
Director
Editor
Mark Goldblatt
Susan Arnold
Casting
Hisako Tsukuba
Co-Producer
Jeff Schechtman
Executive Producer
Roger Corman
Jon Davison
Producer
Pino Donaggio
Original Music Composer
Creature Design
Dave Morton
Mechanical & Creature Designer
Screenplay, Story
Richard Robinson
Story
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