Ronald Davidson (Screenplay) · George H. Plympton (Screenplay) · Jesse Duffy (Screenplay) · Basil Dickey (Screenplay) · Grant Nelson (Screenplay) · Joseph F. Poland (Screenplay)
Tom Steele
The Masked Marvel
Louise Currie
Alice Hamilton
Johnny Arthur
Mura Sakima
William Forrest
Martin Crane
Anthony Warde
'Killer' Mace
Rod Bacon
Jim Arnold
Richard Clarke
Frank Jeffers
David Bacon
Bob Barton
Bill Healy
Terry Morton
Howard Hickman
Warren Hamilton
Eddie Parker
Meggs
Kenneth Harlan
Gas Works Policeman
Thomas Louden
Matthews
Duke Green
Carl - Delivery-Truck Thug / Spike - Gas works saboteur / Kaler - Roof-top thug
Dale Van Sickel
Tall Gas-Works Saboteur / Station-Wagon Thug / Super-X Warehouse Thug #1
Wendell Niles
Newscaster
Lester Dorr
Reporter #1
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A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome saboteur Sakima.
