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.
Hal Andrews / The Black Falcon
Bart Davis
John Cummings
Babs McKay
Billy McKay
Charles Bronson
W. S. Hamilton
Marvin Brewster / The Professor
Simmons
Brewster's Secretary
Hamilton's Secretary
Korman
Hall
Williams
Borden
Dr. Alexander Craig
