Sea Hunt

Lloyd Bridges

Mike Nelson

Leonard Nimoy

Hoya - Saboteur / Indio Ramirez / Jerry Wiley / Johnny Brand /Johnny Bronson / Liquid Explosives Thief (uncredited) / Revolutionary Student (uncredited) / Tyler / Vince

Troy Melton

Charlie / Enemy Agent (uncredited) / Miguel - Convict / Pollywogs Leader (uncredited) / Skin Diver

Joe Dominguez

Arturo Ramirez / Juan / Julio Salas

Jim Bannon

Fire Chief Jim McVey / Police Captain McMurdy / Police Chief Al Clark

Robert Ridgely

Conger Norris / Cougar Norris

Eugene Iglesias

Diego / Perez - Military Police

Eric Feldary

Ben Tempesta / Greg Andrews

A.G. Vitanza

Merker / Pier Manager

Jack Hogan

Billy Riker / Ken Mason

Victor Buono

Dr. Tank Wallace / Seminard

Quinn K. Redeker

Joey / USCG Lt. Bob Camp

Russ Conway

Ed / USCG Lt. Cmdr. Barney Adams

Robert F. Simon

Dr.Tomaso Ricou / Prof. Aaron Halliday

Anthony George

Jim Barry / Stan Graham

Jack Nicholson

John Stark

Herbert Anderson

Professor George Bryan

Meg Wyllie

Mrs. Norris

Kenneth Tobey

Pete Butler

Douglas Henderson

Dr. Barton

Leo Gordon

Panicky Miner

John Doucette

Louis Hale

Leonard Mudie

Eugene Laszlo

Willis Bouchey

Mr. Ward

Sal Ponti

Edward Palmer

Jack Ging

Lou James

Susan Silo

Leliani

Walter Reed

Case Jarrett

Ken Christy

Mr. Palmer

Bruce Dern

FBI Agent John Furillo

Nan Peterson

Norma Carter

Szabó Sándor

Bela Benedek

Gerry Gaylor

Lili Benedek

Mike Steen

Sonny Kendall

Bert Williams

Bill Davies

Barry Harvey

Ramone

Jana Lund

Jill Bromley

Charles Maxwell

USCG Lieutenant

Cyril Delevanti

Lars Anderson

Hanna Landy

Magna Androvich

Valerie Allen

Dana Perry

Mary Lawrence

Dr. Barnes

Keith Richards

Ed Romer

Edson Stroll

Julian Laubec

Nick Dimitri

George Turner

Lomax Study

Dr. Barr

Michael Whalen

Oliver Brandon

Michael Granger

Norm 'Mr. Big' Brown

Robert Clarke

Doug Trimble

Lisabeth Hush

Zoë White

Douglas Fowley

Pop

Christopher Dark

Larry Brand /Larry Bronson

Bill Catching

Frank Brand /Frank Bronson

Al Ruscio

General Cissario Sirrano

Michael Masters

Bill

Nelson Olmsted

Marineland Aquarium Director

Jack Harris

Jim cook

Peter Hansen

Bennett

Steve Mitchell

Wilkes