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