Bradford Dillman
Paul Grogan
Acting
Heather Menzies
Maggie McKeown
Acting
Kevin McCarthy
Dr. Robert Hoak
Acting
Keenan Wynn
Jack
Acting
Dick Miller
Buck Gardner
Acting
Barbara Steele
Dr. Mengers
Acting
Belinda Balaski
Betsy
Acting
Melody Thomas Scott
Laura Dickinson
Acting
Bruce Gordon
Colonel Waxman
Acting
Barry Brown
Trooper
Acting
Paul Bartel
Mr. Dumont
Directing
Shannon Collins
Suzie Grogan
Acting
Shawn Nelson
Whitney
Acting
Richard Deacon
Earl Lyon
Acting
Janie Squire
Barbara Randolph
Acting
Roger Richman
David
Acting
Bill Smillie
Jailer
Acting
Guich Koock
TV Pitchman
Acting
Jack Pauleson
Boy in Canoe
Acting
Eric Henshaw
Father in Canoe
Acting
Robert Vinson
Soldier
Acting
Virginia Dunnam
Girl
Acting
Diamond Farnsworth
Water-skier
Crew
Bruce Paul Barbour
Man in Boat
Crew
Robyn Ray
Screaming Woman
Acting
Mike Sullivan
Dam Guard
Acting
Jack Cardwell
Brandy
Acting
Sally Bondi
Swimming Deb (uncredited)
Acting
Eric Braeden
Dr. Robert Hoak (swimming double) (uncredited)
Acting
Joe Dante
Scuba Diver #2 (uncredited)
Directing
Amy Holden Jones
Hertz Clerk (uncredited)
Writing
Andrew G. La Marca
Scuba Diver #1 (uncredited)
Production
John Sayles
Army Sentry (uncredited)
Directing
Phil Tippett
Scuba Diver (uncredited)
Visual Effects