Joseph Cotten

Admiral

Lloyd Haynes

Lt. Dave Burston

Dewey Martin

Skip Langley

Leonard Nimoy

Comdr. Phil Kettenring

William Windom

Capt. Frank Reardon

Keenan Wynn

Orville Kelly

Malachi Throne

Dr. Dykers

Sam Elliott

Ens. William 'Bill' Sandover

Ivor Barry

Donald Ellington

Ron Masak

CPO Corky Schmidt

Gordon Hoban

Second Karp (False Karp)

Lee Stanley

Lt. Manners

David Thorpe

Lt. Benson

Henry Olek

Cab Driver

Dale Tarter

Clarence W. "CW" Karp (First Karp)

James Beach

Radar Operator

John Winston

English Scientist

Larry McCormick

Radio Operator

Paul Sears

Paine

Ellen Tucker

Mrs. Karp

Bill Keller

Shore Patrolman

Bobby Herbeck

Sonarman

Bo Johnson

Seaman