Colonel Robert Calder

William Hopper

Acting

Marisa Leonardo

Joan Taylor

Acting

Dr. Leonardo

Frank Puglia

Acting

Dr. Judson

John Zaremba

Acting

Maj. Gen. A.D. McIntosh

Thomas Browne Henry

Acting

Commissario Unte

Tito Vuolo

Acting

Signore Contino - Government Official

Jan Arvan

Acting

Dr. Sharman

Arthur Space

Acting

Pepe

Bart Braverman

Acting

Fisherman Mondello (uncredited)

Don Orlando

Acting

Fisherman Verrico (uncredited)

George Khoury

Acting

Reporter Reynolds (uncredited)

Darlene Fields

Acting

Reporter Maples (uncredited)

George Pelling

Acting

Felix Roi, a French reporter (uncredited)

James Dime

Acting

Farmer (uncredited)

Sid Cassel

Acting

Man Feeding Elephant (uncredited)

Ray Harryhausen

Visual Effects

1st Reuters News Correspondent (uncredited)

Noel Drayton

Acting

Dr. Koruku - Japanese Scientist

Rollin Moriyama

Acting