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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Character: Dr. Alexander Thorkel
Character: Bill Stockton
Character: Dr. Mary Robinson
Character: Dr. Rupert Bulfinch
Character: Steve Baker
Character: Pedro
Character: Dr. Mendoza
Character: Prof. Kendall
Character: Woman (uncredited)
Character: Silent Indian (uncredited)