 | Lorna Gray als Dolores Quantero |
 | Kirk Alyn als Cliff Roberts |
 | LeRoy Mason als Carlos Manning |
 | Roy Barcroft als Mel Donovan |
 | Claire Meade als Maria Martinez |
 | Kernan Cripps als Insp. Grogan |
| Jimmy Ames als Romero (Nightclub Owner) [Chs. 3, 9] |
 | Eddie Parker als George Tomkins |
 | Tom Steele als Kidnapper Norton / Streetsweeper Blake / MineThug Dow / BombThug Lyons [Chs. 2, 5, 7, 10] |
 | Dale Van Sickel als Thug Murphy / Police Officer Angus [Chs. 7, 8] / Pete (Truck Theft Thug / Bar Thug [Chs. 1, 9, 11] |
 | Fred Graham als Rollins - Killer [Ch. 6] |
| Tom Quinn als R. J. Riggs (Bomb Maker) [Ch. 10] |
| John Daheim als Morris Kelso (Artist-Thug) [Ch. 11] |
| Ted Mapes als Ned Gray (Thug) [Ch. 4] |
 | I. Stanford Jolley als Lippy Monroe (Thug) [Ch. 5] |
 | Buddy Roosevelt als Woods Thug Moody / MineThug Eddie / Truck Thug Zarco [Chs. 4, 7, 12] |
 | George Chesebro als Art Warehouse Thug (uncredited) |
| Spencer Gordon Bennet | Director |
| Albert DeMond | Screenplay |
| Basil Dickey | Screenplay |
| Jesse Duffy | Screenplay |
| Lynn Perkins | Screenplay |
| Fred C. Brannon | Director |
| Helen Thurston | Stunt Double |
| John Daheim | Stunts |
| Fred Graham | Stunts |
| Carey Loftin | Stunts |
| Ted Mapes | Stunts |
| Eddie Parker | Stunts |
| Tom Steele | Stunts |
| Ken Terrell | Stunts |
| Dale Van Sickel | Stunts |
| Joe Yrigoyen | Stunts |
| Bud Wolfe | Stunts |
| Mort Glickman | Music |
| Ronald Davidson | Associate Producer |
| Cliff Bell Sr. | Editor |
| Harold Minter | Editor |
| Bud Thackery | Director of Photography |
| Fred A. Ritter | Art Direction |
| Russell Kimball | Art Direction |
| Bob Mark | Makeup Supervisor |
| Lee Lukather | Assistant Director |
