Hank Davis, foreman on a huge dam project, enlists the aid of his two flyer friends when a sinister figure known as The Black Ace leads his Mystery Squadron of masked pilots in an attempt to destroy the dam.
Đạo diễn: Colbert Clark, David Howard
Bob Steele
Fred Cromwell
Guinn 'Big Boy' Williams
Bill 'Jellybean' Cook
Lucile Browne
Dorothy Gray
Jack Mulhall
Henry 'Hank' Davis
Purnell Pratt
Lafe Johnson
Robert Frazer
Dr. Flint
J. Carrol Naish
Collins
Bob Kortman
Bracken
Lafe McKee
Stephen Gray
Edward Hearn
Sheriff
Kernan Cripps
Tom
Edward Peil Sr.
Andrew Martin
Jack Mower
Carter
Jack Perrin
Roberts
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