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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| Production | Merian C. Cooper | Producer |
| Directing | Ernest B. Schoedsack | Director |
| Sound | Gerard Carbonara | Original Music Composer |
| Editing | Ellsworth Hoagland | Editor |
| Camera | Henry Sharp | Director of Photography |
| Writing | Malcolm Stuart Boylan | Screenplay |
| Writing | Tom Kilpatrick | Screenplay |
| Production | Dale Van Every | Producer |
| Sound | Albert Hay Malotte | Original Music Composer |
| Sound | Ernst Toch | Original Music Composer |
| Art | A. E. Freudeman | Set Designer |
