Walter Pidgeon
Role: Admiral Harriman Nelson
Robert Sterling
Role: Captain Lee Crane
Barbara Eden
Role: Lieutenant Cathy Conners
Peter Lorre
Role: Comm. Lucius Emery
Joan Fontaine
Role: Dr. Susan Hiller
Michael Ansara
Role: Dr. Miguel Alvares
Frankie Avalon
Role: Lieutenant Chip Romano
Regis Toomey
Role: Dr. Jamieson
John Litel
Role: Vice Admiral B.J. Crawford
Howard McNear
Role: Congressman Llewellyn Parker
Henry Daniell
Role: Dr. Zucco
Robert Easton
Role: Sparks
Charles Tannen
Role: CPO Mack Gleason
Mark Slade
Role: Seaman Jimmy 'Red' Smith
Del Monroe
Role: Seaman Kowski
Jonathan Gilmore
Role: Seaman George Young
Anthony Monaco
Role: Cookie
Skip Ward
Role: Crew Member
Michael Ford
Role: Crew Member
William Herrin
Role: Crew Member (Uncredited)
Robert Buckingham
Role: Crew Member (Uncredited)
Richard Adams
Role: Crew Member (Uncredited)
Jimmy Murphy
Role: Crew Member (Uncredited)
George Diestel
Role: Lieutenant Hodges (Uncredited)
Larry Gray
Role: Dr. Newmar (Uncredited)
David McLean
Role: Ned Thompson (Uncredited)
Edward Rickard
Role: Officer (Uncredited)
Charles Dierkop
Role: Seaview Pilot (Uncredited)
Kendrick Huxham
Role: UN Committee Chairman (Uncredited)
Art Baker
Role: UN Commentator (Uncredited)
Rodger Terry
Role: Guard (Uncredited)
Brad Brown
Role: Guard (Uncredited)
Raoul Freeman
Role: Delegate (Uncredited)
Al Bain
Role: Delegate (Uncredited)
Harry Baum
Role: Delegate (Uncredited)
Benjie Bancroft
Role: Delegate (Uncredited)
Michael Cirillo
Role: Delegate (Uncredited)
Harry Denny
Role: Delegate (Uncredited)
John Giovanni
Role: Delegate (Uncredited)
Bhupesh Guha
Role: Delegate (Uncredited)
Esther Ying Lee
Role: Delegate (Uncredited)
Robert Locke Lorraine
Role: Delegate (Uncredited)
George Nardelli
Role: Delegate (Uncredited)
Paul Power
Role: Delegate (Uncredited)
Paul Ravel
Role: Delegate (Uncredited)
Scott Seaton
Role: Delegate (Uncredited)
Leslie Sketchley
Role: Delegate (Uncredited)
Ray Spiker
Role: Delegate (Uncredited)
Hal Taggart
Role: Delegate (Uncredited)
Robert Strong
Role: Delegate (Uncredited)
Ron Nyman
Role: Crew Member (uncredited)
