

Four explorers are summoned to Peru by the brilliant physicist Dr Thorkel. They discover a rich source of radium and a half-mad Thorkel who shrinks them down to one-fifth their normal size when they threaten to stop his unorthodox experimentation.
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Frank Yaconelli
Pedro

Paul Fix
Dr. Mendoza

Frank Reicher
Prof. Kendall
Jane Webb
Woman (uncredited)

Billy Wilkerson
Silent Indian (uncredited)