The Invisible Monster

Man-woman team of investigators uncover a gang whose mad scientist leader has developed an invisibility chemical and plans to build a mercenary army of invisible men.

• 
  Fred C. Brannon

• 
  Richard Webb
  Lane Carson
• 
  Aline Towne
  Carol Richards
• 
  Stanley Price
  The Phantom Ruler
• 
  Lane Bradford
  Burton
• 
  John Crawford
  Harris
• 
  George Meeker
  "Harry Long"
• 
  Edward Keane
  Warren Madison
• 
  Dale Van Sickel
  Otto Wagner, aka "Frank Martin"
• 
  Douglas Evans
  "James Hunter"
• 
  John Hamilton
  "Henry Miller"
• 
  Roy Gordon
  Mr. Moore
• 
  Harold Goodwin
  Kirk - Body-Shop Henchman [Ch.11] (uncredited)
• 
  Marshall Reed
  Roadblock Cop [Ch. 1, 7]
• 
  David Sharpe
  Garage Watchman [Ch. 3] / Armored Car Guard [Ch. 11]
• 
  George Magrill
  Henchman Sam [Ch. 4-5]
• 
  Guy Teague
  Decoy & Dumptruck Henchman [Ch. 5, 7]
• 
  Tom Steele
  Henchman Bill 'Mack' Haines [Chapters 5, 10]
• 
  Eddie Parker
  Barn Henchman Stoner [Ch.8]
• 
  Keith Richards
  Doctor [Ch. 12]
• 
  Duke Taylor
  Second Roadblock Cop [Ch. 1 bit]