Joseph Cotten
Admiral
Acting
Lloyd Haynes
Lt. Dave Burston
Acting
Dewey Martin
Skip Langley
Acting
Leonard Nimoy
Comdr. Phil Kettenring
Acting
William Windom
Capt. Frank Reardon
Acting
Keenan Wynn
Orville Kelly
Acting
Malachi Throne
Dr. Dykers
Acting
Sam Elliott
Ens. William 'Bill' Sandover
Acting
Ivor Barry
Donald Ellington
Acting
Ron Masak
CPO Corky Schmidt
Acting
Gordon Hoban
Second Karp (False Karp)
Acting
Lee Stanley
Lt. Manners
Acting
David Thorpe
Lt. Benson
Acting
Henry Olek
Cab Driver
Acting
Dale Tarter
Clarence W. "CW" Karp (First Karp)
Acting
James Beach
Radar Operator
Acting
John Winston
English Scientist
Acting
Larry McCormick
Radio Operator
Acting
Paul Sears
Paine
Acting
Ellen Tucker
Mrs. Karp
Acting
Bill Keller
Shore Patrolman
Acting
Bobby Herbeck
Sonarman
Writing
Bo Johnson
Seaman
Acting