 Sally EilersIrene Eaton a.k.a. Margaret Brennan | Irene Eaton a.k.a. Margaret Brennan |
 Allan LaneGeorge Wolf / James Huntley | George Wolf / James Huntley |
 Fritz LeiberDr. Krull | Dr. Krull |
 Frank M. ThomasCol. John Shaw | Col. John Shaw |
 Theodore von EltzCol. Marvin Page | Col. Marvin Page |
 Addison RichardsSenator Everett Brock | Senator Everett Brock |
 Larry J. BlakeBen Dawson | Ben Dawson |
 Pierre WatkinColonel Wilson | Colonel Wilson |
 Louis Jean HeydtGillian | Gillian |
 Spencer ChartersLucius Wilkins | Lucius Wilkins |
 Leona RobertsElla Wilkins | Ella Wilkins |
 Charles HaltonBeldon | Beldon |
 Alec CraigCanby | Canby |
 Stanley BlystoneDetective | Detective |
| HHarry Joe Brown Jr.Young Boy | Young Boy |
| HHal CraigMotorcycle Policeman | Motorcycle Policeman |
 Robert FiskeDavis | Davis |
 Bess FlowersPlane Crash Spectator | Plane Crash Spectator |
 Christian J. FrankHenchman Tailing Irene | Henchman Tailing Irene |
 Bud GearyPoliceman | Policeman |
| HHarrison GreeneMan on Train Wanting 'Less Red Tape' | Man on Train Wanting 'Less Red Tape' |
| RRoger HuntMinor Role | Minor Role |
 Mike LallyHenchman | Henchman |
 Harold MillerBar Patron at Club Dome | Bar Patron at Club Dome |
 Howard M. MitchellPolice Captain | Police Captain |
| EEdmund MortimerMan with Senator in the Dome Cafe | Man with Senator in the Dome Cafe |
 Pat O'MalleyIntelligence Service Man | Intelligence Service Man |
 Grady SuttonQuiet Man on Train | Quiet Man on Train |
 Richard TuckerColonel at Explosion | Colonel at Explosion |
 William WorthingtonSenator in the Dome Cafe | Senator in the Dome Cafe |
