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