Admiral Harriman Nelson
Walter Pidgeon
Captain Lee Crane
Robert Sterling
Dr. Zucco
Henry Daniell
Sparks
Robert Easton
CPO Mack Gleason
Charles Tannen
Seaman Jimmy 'Red' Smith
Mark Slade
Seaman Kowski
Del Monroe
Seaman George Young
Jonathan Gilmore
Cookie
Anthony Monaco
Crew Member
Skip Ward
Michael Ford
Crew Member (Uncredited)
William Herrin
Lieutenant Cathy Conners
Barbara Eden
Robert Buckingham
Richard Adams
Jimmy Murphy
Lieutenant Hodges (Uncredited)
George Diestel
Dr. Newmar (Uncredited)
Larry Gray
Ned Thompson (Uncredited)
David McLean
Officer (Uncredited)
Edward Rickard
Seaview Pilot (Uncredited)
Charles Dierkop
UN Committee Chairman (Uncredited)
Kendrick Huxham
UN Commentator (Uncredited)
Art Baker
Comm. Lucius Emery
Peter Lorre
Guard (Uncredited)
Rodger Terry
Brad Brown
Delegate (Uncredited)
Raoul Freeman
Al Bain
Harry Baum
Benjie Bancroft
Michael Cirillo
Harry Denny
John Giovanni
Bhupesh Guha
Dr. Susan Hiller
Joan Fontaine
Esther Ying Lee
Robert Locke Lorraine
George Nardelli
Paul Power
Paul Ravel
Scott Seaton
Leslie Sketchley
Ray Spiker
Hal Taggart
Robert Strong
Dr. Miguel Alvares
Michael Ansara
Lieutenant Chip Romano
Frankie Avalon
Dr. Jamieson
Regis Toomey
Vice Admiral B.J. Crawford
John Litel
Congressman Llewellyn Parker
Howard McNear
Producer
Irwin Allen
Screenplay
Director
Story
Makeup Artist
Ben Nye
Charles Bennett
Art Direction
Herman A. Blumenthal
Original Music Composer
Paul Sawtell
Set Decoration
John Sturtevant
Costume Design
Paul Zastupnevich
Walter M. Scott
Editor
George Boemler
Director of Photography
Winton C. Hoch
Jack Martin Smith
Bert Shefter
Technical Advisor
Fred Zendar
Stunts
Johnny Hagner
Conductor
Orchestrator
Max Reese
Producer's Assistant
Al Gail
Sound
Alfred Bruzlin
Warren B. Delaplain
Special Effects
Johnny Borgese
Paul Stader
Visual Effects
L.B. Abbott
Assistant Director
Ad Schaumer
Zale Parry
Transportation Coordinator
Jim Martell
Underwater Camera
John Lamb
Hairstylist
Helen Turpin