66 mins | Drama, Crime | April 3, 1938
66 mins | Drama, Crime | April 3, 1938
| Producers | Republic Pictures |
| Original title | Invisible Enemy |
| Directors | John H. Auer |
| Writers | Norman Burnstine, Robert T. Shannon, Alex Gottlieb, Albert J. Cohen |
as Jeffrey Clavering
as Sandra Kamarov
as Princess Stephanie
as Nikolai Kamarov
as Sergeant Alfred M. Higgs
as Bassett
as Michael (as Ivan Simpson)
as Sophia
as Alex
as Sir Herbert Donbridge
as Sir Joshua Longstreet
as Kirman
as Signor Bramucci
as Kamarov's Butler
as Foreign Diplomat
as Secondary Supporting Role
as Chauffeur
as Foreign Diplomat