 Ralph BellamyInsp. Steve Trent | Insp. Steve Trent |
 Shirley GreyBetty Lane | Betty Lane |
 Gail PatrickHelen Stanley | Helen Stanley |
 Kane RichmondLee Davis | Lee Davis |
 Bradley PageGeorge T. Noel | George T. Noel |
 Vincent ShermanKarl Williams | Karl Williams |
 Phillip TrentLarry King (as Clifford Jones) | Larry King (as Clifford Jones) |
 Arthur RankinJimmy | Jimmy |
 Lucien PrivalGibson | Gibson |
 Ward BondJack Baker | Jack Baker |
 Helen Eby-RockJessie Allen | Jessie Allen |
 Frank O'ConnorBallistic Expert | Ballistic Expert |
 Charles BrinleyElectrician (uncredited) | Electrician (uncredited) |
| AA.S. ByronDetective #3 (uncredited) | Detective #3 (uncredited) |
 Stephen ChaseWallach (uncredited) | Wallach (uncredited) |
 Jack CheathamMotorcycle Officer (uncredited) | Motorcycle Officer (uncredited) |
 Edmund CobbElectrician (uncredited) | Electrician (uncredited) |
 Kernan CrippsGateman (uncredited) | Gateman (uncredited) |
 Budd FineGuard #1 (uncredited) | Guard #1 (uncredited) |
 Pat HarmonElectrician (uncredited) | Electrician (uncredited) |
| AA.R. HayselDetective #2 (uncredited) | Detective #2 (uncredited) |
 William HumphreyDoctor (uncredited) | Doctor (uncredited) |
 Edward KeaneMr. Richardson - Studio Manager (uncredited) | Mr. Richardson - Studio Manager (uncredited) |
 Sam LufkinMotorcycle Officer (uncredited) | Motorcycle Officer (uncredited) |
| BBuck MackElectrician (uncredited) | Electrician (uncredited) |
 Frank MillsProperty Man (uncredited) | Property Man (uncredited) |
| BBruce MitchellGuard #2 (uncredited) | Guard #2 (uncredited) |
| EEarl PingreeDetective #1 (uncredited) | Detective #1 (uncredited) |
 Hal PriceReilly (uncredited) | Reilly (uncredited) |
| KKy RobinsonJennings (uncredited) | Jennings (uncredited) |
