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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Main Cast: Albert Dekker, Thomas Coley, Janice Logan, Charles Halton, Victor Kilian, Frank Yaconelli, Paul Fix, Frank Reicher, Jane Webb, Billy Wilkerson

Director: Ernest B. Schoedsack

Writers: Malcolm Stuart Boylan, Tom Kilpatrick

Editor: Ellsworth Hoagland

Cinematographer: Henry Sharp

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