All Cast
Stuart Whitman
Adm. Michael Matthews
Robert Wagner
Brett
Rosemary Forsyth
Lia Holmes
Robert Colbert
Cmdr. Woody Patterson
Burr DeBenning
Aguila
Susana Miranda
Elena
Paul Stewart
Barton
Whit Bissell
Prof. Holmes
Richard Basehart
The President
Joseph Cotten
Dr. Ziegler
James Darren
Dr. Talty
Sugar Ray Robinson
Capt. Hunter
Charles Dierkop
Quinn
Larry Pennell
Bill Holmes
William Bryant
Capt. Lunderson
Robert Dowdell
Young Officer
Edward G. Robinson Jr.
Dr. Burkson
Sheila Allen
Blonde Woman
Tom Drake
Gen. Putnam
Johnny Lee
Tony
Glenna Sergent
Sally
Ray Didsbury
Security Guard
Erik L. Nelson
Triton Controller
Paul Bradley
Scientist (uncredited)
Brent Dunsford
Technician (uncredited)
George Holmes
Scientist (uncredited)