The US Government tries to track down embedded Nazi agents in the States.
| Actor | Role |
|---|---|
 William EytheBill Dietrich | Bill Dietrich |
 Lloyd NolanAgent George A. Briggs | Agent George A. Briggs |
 Signe HassoElsa Gebhardt | Elsa Gebhardt |
 Gene LockhartCharles Ogden Roper | Charles Ogden Roper |
 Leo G. CarrollCol. Hammersohn | Col. Hammersohn |
| LLydia St. ClairJohanna Schmidt | Johanna Schmidt |
 William Post Jr.Walker | Walker |
 Harry BellaverMax Cobura | Max Cobura |
 Reed HadleyNarrator (voice) | Narrator (voice) |
 Kenneth KonopkaSaboteur | Saboteur |
| BBruno WickAdolf Lange | Adolf Lange |
| HHarro MellerConrad Arnulf | Conrad Arnulf |
 Charles WagenheimGustav Hausmann | Gustav Hausmann |
| AAlfred LinderAdolf Klein | Adolf Klein |
| RRenee CarsonLuise Vajda | Luise Vajda |
| JJack McKeeDr. Arthur C. Appleton | Dr. Arthur C. Appleton |
 Rusty LaneAdmiral | Admiral |