Walter Pidgeon
Admiral Harriman Nelson

Robert Sterling
Captain Lee Crane

Barbara Eden
Lieutenant Cathy Conners

Peter Lorre
Comm. Lucius Emery

Joan Fontaine
Dr. Susan Hiller

Michael Ansara
Dr. Miguel Alvares

Frankie Avalon
Lieutenant Chip Romano

Regis Toomey
Dr. Jamieson

John Litel
Vice Admiral B.J. Crawford

Howard McNear
Congressman Llewellyn Parker

Henry Daniell
Dr. Zucco

Robert Easton
Sparks

Charles Tannen
CPO Mack Gleason

Mark Slade
Seaman Jimmy 'Red' Smith

Del Monroe
Seaman Kowski

Jonathan Gilmore
Seaman George Young

Skip Ward
Crew Member

Michael Ford
Crew Member

William Herrin
Crew Member (Uncredited)

Robert Buckingham
Crew Member (Uncredited)