Piranha

Maggie McKeown

Heather Menzies

A determined but somewhat absent-minded insurance investigator.

Jack

Keenan Wynn

A friend of Grogan.

Dr. Mengers

Barbara Steele

A scientist who worked on Project Razorteeth.

Colonel Waxman

Bruce Gordon

Leader of a military team assigned to destroy the Piranha's.

Dr. Robert Hoak

Kevin McCarthy

The lead scientist on a Vietnam war project to genetically engineer murder piranha's.

Paul Grogan

Bradford Dillman

A surly backwoods drunkard hired by McKeown to act as a guide.

David

Roger Richman

A young guy, tempted to skinnydip inside a closed-down military installation.

Barbara

A girl who tempts her boyfriend to go skinnydipping in a myserious tank.

Suzie Grogan

Shannon Collins

Paul's daughter.

Buck Gardner

Dick Miller

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Betsy

Belinda Balaski

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Laura Dickinson

Melody Thomas Scott

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Trooper

Barry Brown

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Mr. Dumont

Paul Bartel

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Earl Lyon

Richard Deacon

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Scuba Diver

Phil Tippett

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Whitney

Shawn Nelson

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Army Sentry (uncredited)

John Sayles

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Jailer

Bill Smillie

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Boy in Canoe

Jack Pauleson

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Father in Canoe

Eric Henshaw

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Water-skier (as Hill Farnsworth)

Diamond Farnsworth

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