The Invisible Monster

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]