Dr. Cyclops

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.

• 
  Albert Dekker

  Dr. Alexander Thorkel
• 
  Thomas Coley

  Bill Stockton
• 
  Janice Logan

  Dr. Mary Robinson
• 
  Charles Halton

  Dr. Rupert Bulfinch
• 
  Victor Kilian

  Steve Baker
• 
  Frank Yaconelli

  Pedro
• 
  Paul Fix

  Dr. Mendoza
• 
  Frank Reicher

  Prof. Kendall
• 
  Billy Wilkerson

  Silent Indian (uncredited)