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.
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]
Mark Strong
Bank Watchman [Ch.1 bit]
Bert LeBaron
Crooked Watchman [Ch. 2 bit]
Frank O'Connor
Chemical Truck Cop [Ch. 5 bit]
Forrest Burns
Watchman Joe [Ch. 5 bit]
Carey Loftin
Dynamite Henchman Dirk [Ch. 6 bit]
Tom Monroe
Cave Policeman [Ch. 7 bit]
Howard M. Mitchell
Second Garage Watchman [Ch. 7 bit]
Charles Sullivan
Squadcar Cop [Ch. 7 bit]
George Volk
Second Armored Car Guard [Ch. 11 bit]
Howard Lydecker
Special Effects
Eddie Parker
Stunts
Franklin Adreon
Producer
Duke Taylor
Stunts
Theodore Lydecker
Special Effects
Guy Teague
Stunts
Cliff Bell Sr.
Editor
Ronald Davidson
Screenplay
Sam Starr
Editor
Dale Van Sickel
Stunts
Bert LeBaron
Stunts
Fred C. Brannon
Director
Earl Crain Sr.
Sound Engineer
George Magrill
Stunts
Bud Wolfe
Stunts
Carey Loftin
Stunts
David Sharpe
Stunts
Tom Steele
Stunts
Bob Mark
Makeup Department Head
Ellis W. Carter
Director of Photography
Stanley Wilson
Original Music Composer
Ken Terrell
Stunts