Drummond goes up against foreign agents who are trying to steal plans for a top-secret aircraft.
| Actor | Role |
|---|---|
 John LodgeHugh "Bulldog" Drummond | Hugh "Bulldog" Drummond |
 Dorothy MackaillDoris Thompson | Doris Thompson |
 Victor JoryGregoroff | Gregoroff |
| CClaud AllisterAlgy Longworth | Algy Longworth |
 Richard BirdCaldwell | Caldwell |
 Hugh MillerIvan Kalinsky | Ivan Kalinsky |
 Leslie PerrinsMajor Grayson | Major Grayson |
| BBrian BuchelMeredith | Meredith |
 Jim GéraldVeight | Veight |
 Maire O'NeillNorah | Norah |
| AAnnie EsmondMrs. Caldwell | Mrs. Caldwell |
| FFrank CochraneDr. Belfrus | Dr. Belfrus |
 William DewhurstReginald Portside | Reginald Portside |
| BBen WilliamsReporter | Reporter |
 Wilfrid Hyde-WhiteConrad | Conrad |