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