On screen
Cast
34 credited performers
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
Artwork unavailable
Shannon Collins
Suzie Grogan
Artwork unavailable
Shawn Nelson
Whitney
Richard Deacon
Earl Lyon
Janie Squire
Barbara Randolph
Artwork unavailable
Roger Richman
David
Artwork unavailable
Bill Smillie
Jailer
Guich Koock
TV Pitchman
Artwork unavailable
Jack Pauleson
Boy in Canoe
Artwork unavailable
Eric Henshaw
Father in Canoe
Artwork unavailable
Robert Vinson
Soldier
Artwork unavailable
Virginia Dunnam
Girl
Artwork unavailable
Diamond Farnsworth
Water-skier
Bruce Paul Barbour
Man in Boat
Artwork unavailable
Robyn Ray
Screaming Woman
Artwork unavailable
Mike Sullivan
Dam Guard
Artwork unavailable
Jack Cardwell
Brandy
Artwork unavailable
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)
Artwork unavailable
Andrew G. La Marca
Scuba Diver #1 (uncredited)
John Sayles
Army Sentry (uncredited)
Phil Tippett
Scuba Diver (uncredited)