Paul Grogan
Maggie McKeown (as Heather Menzies)
Dr. Robert Hoak
Jack
Buck Gardner
Dr. Mengers
Betsy
Laura Dickinson (as Melody Thomas)
Colonel Waxman
Trooper
Mr. Dumont
Suzie Grogan
Whitney
Earl Lyon
Barbara Randolph
David
Jailer
TV Pitchman
Boy in Canoe
Father in Canoe
Soldier
Girl
Water-skier (as Hill Farnsworth)
Man in Boat (as Bruce Barbour)
Screaming Woman
Dam Guard
Brandy
Swimming Deb (uncredited)
Dr. Robert Hoak (swimming double) (uncredited)
Scuba Diver #2 (uncredited)
Hertz Clerk (uncredited)
Beach goer (uncredited)
Scuba Diver #1 (uncredited)
Army Sentry (uncredited)
Scuba Diver #3 (victim) (uncredited)