Piranha

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)

Richard Deacon

(Earl Lyon)

Guich Koock

(TV Pitchman)

Eric Braeden

(Dr. Robert Hoak (swimming double) (uncredited))

Joe Dante

(Scuba Diver #2 (uncredited))

Amy Holden Jones

(Hertz Clerk (uncredited))

John Sayles

(Army Sentry (uncredited))

Phil Tippett

(Scuba Diver (uncredited))