Four flying G-Men protect America against enemy spies; one of the four assumes the identity of The Black Falcon, to befuddle the saboteurs even further.
| Actor | Role |
|---|---|
 Robert PaigeHal Andrews / The Black Falcon | Hal Andrews / The Black Falcon |
 Richard FiskeBart Davis | Bart Davis |
 James CraigJohn Cummings | John Cummings |
 Lorna GrayBabs McKay | Babs McKay |
 Sammy McKimBilly McKay | Billy McKay |
 Stanley BrownCharles Bronson | Charles Bronson |
 Don BeddoeW. S. Hamilton | W. S. Hamilton |
 Forbes MurrayMarvin Brewster / The Professor | Marvin Brewster / The Professor |
| LLee PratherSimmons | Simmons |
 Beatrice BlinnBrewster's Secretary | Brewster's Secretary |
 Ann DoranHamilton's Secretary | Hamilton's Secretary |
 Dick CurtisKorman | Korman |
 Eddie LaughtonHall | Hall |
 John TyrrellWilliams | Williams |
 Eddie FetherstonBorden | Borden |
 John DilsonDr. Alexander Craig | Dr. Alexander Craig |