 Conrad VeidtOtto Becker / Baron Hugo von Detner | Otto Becker / Baron Hugo von Detner |
 Ann AyarsKaaren De Relle | Kaaren De Relle |
 Frank ReicherFritz | Fritz |
 Dorothy TreeMiss Harper | Miss Harper |
 Ivan F. SimpsonProfessor Sterling (as Ivan Simpson) | Professor Sterling (as Ivan Simpson) |
 William TannenLudwig | Ludwig |
 Martin KosleckKurt Richten | Kurt Richten |
 Marc LawrenceJoe Aiello | Joe Aiello |
 Sidney BlackmerArnold Milbar | Arnold Milbar |
 Moroni OlsenBrenner | Brenner |
 Pierre WatkinGrover Blaine McHenry | Grover Blaine McHenry |
| EErnie AlexanderSailor (uncredited) | Sailor (uncredited) |
 Rudolph AndersCab Driver (uncredited) | Cab Driver (uncredited) |
 Jessie ArnoldLandlady (uncredited) | Landlady (uncredited) |
| WWalter BaconSpy (uncredited) | Spy (uncredited) |
| PPolly BaileyFat Woman (uncredited) | Fat Woman (uncredited) |
 Roy BarcroftChief Petty Officer (uncredited) | Chief Petty Officer (uncredited) |
 Barbara BedfordWoman (uncredited) | Woman (uncredited) |
| AArthur BelascoDetective (uncredited) | Detective (uncredited) |
 Walter ByronOfficer (uncredited) | Officer (uncredited) |
 Baldwin CookeWaiter (uncredited) | Waiter (uncredited) |
| HHal CookeClerk (uncredited) | Clerk (uncredited) |
| CClyde CourtrightDoorman (uncredited) | Doorman (uncredited) |
 Stuart CrawfordCommentator (voice) (uncredited) | Commentator (voice) (uncredited) |
| JJack DaleyReporter (uncredited) | Reporter (uncredited) |
 Mark DanielsCab Driver (uncredited) | Cab Driver (uncredited) |
| CCliff DanielsonYouth (uncredited) | Youth (uncredited) |
| JJack DeeryDiplomat (uncredited) | Diplomat (uncredited) |
 Drew DemorestReporter (uncredited) | Reporter (uncredited) |
| HHarry DennyRestaurant Patron (uncredited) | Restaurant Patron (uncredited) |
