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