Cast
William Hopper
Colonel Robert Calder
Joan Taylor
Marisa Leonardo
Frank Puglia
Dr. Leonardo
John Zaremba
Dr. Judson
Thomas Browne Henry
Maj. Gen. A.D. McIntosh
Tito Vuolo
Commissario Unte
Jan Arvan
Signore Contino - Government Official
Arthur Space
Dr. Sharman
Bart Braverman
Pepe
Don Orlando
Fisherman Mondello (uncredited)
Crew
Charles H. Schneer
Producer
Nathan Juran
Director
Robert Creighton Williams
Screenplay
Ray Harryhausen
Visual Effects
Lawrence W. Butler
Special Effects
Mischa Bakaleinikoff
Original Music Composer
Christopher Knopf
Screenplay
Charlotte Knight
Story
Robert Priestley
Set Decoration
Edwin H. Bryant
Editor
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