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Cast (34)
Bradford Dillman
as Paul Grogan
Heather Menzies
as Maggie McKeown
Kevin McCarthy
as Dr. Robert Hoak
Keenan Wynn
as Jack
Dick Miller
as Buck Gardner
Barbara Steele
as Dr. Mengers
Belinda Balaski
as Betsy
Melody Thomas Scott
as Laura Dickinson
Bruce Gordon
as Colonel Waxman
Barry Brown
as Trooper
Paul Bartel
as Mr. Dumont
S.C
Shannon Collins
as Suzie Grogan
S.N
Shawn Nelson
as Whitney
Richard Deacon
as Earl Lyon
J.S
Janie Squire
as Barbara Randolph
R.R
Roger Richman
as David
B.S
Bill Smillie
as Jailer
Guich Koock
as TV Pitchman
J.P
Jack Pauleson
as Boy in Canoe
E.H
Eric Henshaw
as Father in Canoe
R.V
Robert Vinson
as Soldier
V.D
Virginia Dunnam
as Girl
D.F
Diamond Farnsworth
as Water-skier
Bruce Paul Barbour
as Man in Boat
R.R
Robyn Ray
as Screaming Woman
M.S
Mike Sullivan
as Dam Guard
J.C
Jack Cardwell
as Brandy
S.B
Sally Bondi
as Swimming Deb (uncredited)
Eric Braeden
as Dr. Robert Hoak (swimming double) (uncredited)
Joe Dante
as Scuba Diver #2 (uncredited)
Amy Holden Jones
as Hertz Clerk (uncredited)
A.M
Andrew G. La Marca
as Scuba Diver #1 (uncredited)
John Sayles
as Army Sentry (uncredited)
Phil Tippett
as Scuba Diver (uncredited)
