Lorna Gray

Dolores Quantero

Kirk Alyn

Cliff Roberts

LeRoy Mason

Carlos Manning

Roy Barcroft

Mel Donovan

Claire Meade

Maria Martinez

Kernan Cripps

Insp. Grogan

Jimmy Ames

Romero (Nightclub Owner) [Chs. 3, 9]

Eddie Parker

George Tomkins

Tom Steele

Kidnapper Norton / Streetsweeper Blake / MineThug Dow / BombThug Lyons [Chs. 2, 5, 7, 10]

Dale Van Sickel

Thug Murphy / Police Officer Angus [Chs. 7, 8] / Pete (Truck Theft Thug / Bar Thug [Chs. 1, 9, 11]

Fred Graham

Rollins - Killer [Ch. 6]

Tom Quinn

R. J. Riggs (Bomb Maker) [Ch. 10]

John Daheim

Morris Kelso (Artist-Thug) [Ch. 11]

Ted Mapes

Ned Gray (Thug) [Ch. 4]

I. Stanford Jolley

Lippy Monroe (Thug) [Ch. 5]

Buddy Roosevelt

Woods Thug Moody / MineThug Eddie / Truck Thug Zarco [Chs. 4, 7, 12]

George Chesebro

Art Warehouse Thug (uncredited)