Cast
Beatrice Blinn
Brewster's Secretary
Dick Curtis
Korman
Eddie Laughton
Hall
John Dilson
Dr. Alexander Craig
John Tyrrell
Williams
Richard Fiske
Bart Davis
Don Beddoe
W. S. Hamilton
Ann Doran
Hamilton's Secretary
Eddie Fetherston
Borden
Robert Paige
Hal Andrews / The Black Falcon
James Craig
John Cummings
Sammy McKim
Billy McKay
Lorna Gray
Babs McKay
Stanley Brown
Charles Bronson
Forbes Murray
Marvin Brewster / The Professor