Lorna Gray
Dolores Quantero
Acting
Kirk Alyn
Cliff Roberts
Acting
LeRoy Mason
Carlos Manning
Acting
Roy Barcroft
Mel Donovan
Acting
Claire Meade
Maria Martinez
Acting
Kernan Cripps
Insp. Grogan
Acting
Jimmy Ames
Romero (Nightclub Owner) [Chs. 3, 9]
Acting
Eddie Parker
George Tomkins
Acting
Tom Steele
Kidnapper Norton / Streetsweeper Blake / MineThug Dow / BombThug Lyons [Chs. 2, 5, 7, 10]
Acting
Dale Van Sickel
Thug Murphy / Police Officer Angus [Chs. 7, 8] / Pete (Truck Theft Thug / Bar Thug [Chs. 1, 9, 11]
Acting
Fred Graham
Rollins - Killer [Ch. 6]
Acting
Tom Quinn
R. J. Riggs (Bomb Maker) [Ch. 10]
Acting
John Daheim
Morris Kelso (Artist-Thug) [Ch. 11]
Acting
Ted Mapes
Ned Gray (Thug) [Ch. 4]
Acting
I. Stanford Jolley
Lippy Monroe (Thug) [Ch. 5]
Acting
Buddy Roosevelt
Woods Thug Moody / MineThug Eddie / Truck Thug Zarco [Chs. 4, 7, 12]
Acting
George Chesebro
Art Warehouse Thug (uncredited)
Acting