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

Shannon Collins

Suzie Grogan

Shawn Nelson

Whitney

Richard Deacon

Earl Lyon

Janie Squire

Barbara Randolph

Roger Richman

David

Bill Smillie

Jailer

Guich Koock

TV Pitchman

Jack Pauleson

Boy in Canoe

Eric Henshaw

Father in Canoe

Robert Vinson

Soldier

Virginia Dunnam

Girl

Diamond Farnsworth

Water-skier

Bruce Paul Barbour

Man in Boat

Robyn Ray

Screaming Woman

Mike Sullivan

Dam Guard

Jack Cardwell

Brandy

Sally Bondi

Swimming Deb (uncredited)

Eric Braeden

Dr. Robert Hoak (swimming double) (uncredited)

Joe Dante

Scuba Diver #2 (uncredited)

Amy Holden Jones

Hertz Clerk (uncredited)

Andrew G. La Marca

Scuba Diver #1 (uncredited)

John Sayles

Army Sentry (uncredited)

Phil Tippett

Scuba Diver (uncredited)

Pino Donaggio

Original Music Composer

Joe Dante

Editor

Mark Goldblatt

Editor

Roger Corman

Executive Producer

Joe Dante

Director

John Sayles

Screenplay

Jon Davison

Producer

Dave Morton

Mechanical & Creature Designer

Jon Berg

Special Effects

Chris Walas

Special Props

Vincent Prentice

Special Effects Makeup Artist

Rob Bottin

Special Effects Makeup Artist

Phil Tippett

Creature Design

Robert Short

Special Props

Conrad E. Palmisano

Stunt Coordinator

Chako Van Leeuwen

Co-Producer

Jeff Schechtman

Executive Producer

筑波久子

Co-Producer

Jeff Ayers

Set Decoration

Jamie Anderson

Director of Photography

Kerry Mellin

Art Direction

John Sayles

Story

Bill Mellin

Art Direction

Richard Robinson

Story

Roger Creed

Stunts

Nick Palmisano

Stunts

Bobby Sargent

Stunts

Tom Jacobson

Production Manager

Harry Wowchuk

Location Manager

Jools Tippett

Special Effects Assistant

Jerome Seven

Special Effects Assistant

Doug Barnett

Mechanical & Creature Designer

Adam Beckett

Animation

Susan Arnold

Casting Director

Ben Haller

Key Grip

Joel Goldsmith

Location Sound Mixer

Michael Katz

Gaffer

Charles H. Eglee

Assistant Director

Greg Gears

Assistant Director

Dana Christiaansen

Assistant Camera

Andrew G. La Marca

Assistant Camera

Tony Santa Croce

Boom Operator

Kevin Hughes

Props

Kathleen Hughes

Props

Chris Brightman

Grip

Bill Decker

Grip

Tim Doughten

Assistant Art Director

Brenda Balanda

Assistant Editor

Stacy Russo

Assistant Editor

Jeanne Rosenberg

Script Supervisor

Sharron Reynolds

Production Secretary

Ashley Stieglitz

Production Secretary

Jack Buehler

Wardrobe Assistant

O. C. Perkins

Still Photographer

Ted Boehler

Still Photographer

Ed Tarbutton

Production Assistant

Jeff Hoffman

Production Assistant

Michael Martin

Production Assistant

Jim Boni

Production Assistant

Robet Brown

Production Assistant

Dick Lowry

Second Unit Director

Tom Hammel

Production Manager

M. Todd Henry

Second Unit Director of Photography

Christopher Tufty

Assistant Camera

Clyde E. Bryan

Assistant Camera

Scott Buttfield

Grip

Moshe Levin

Grip

Richard Anderson

Sound Effects

Dave Yewdall

Sound Effects

Teresa Eckton

Sound Effects

Kendrick Sweet

Dialogue Editor

Valcie Yewdall

Foley