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.
Bob Steele
as Fred Cromwell
Guinn "Big Boy" Williams
as Bill 'Jellybean' Cook
Lucile Browne
as Dorothy Gray
Jack Mulhall
as Henry 'Hank' Davis
Purnell Pratt
as Lafe Johnson
Robert Frazer
as Dr. Flint
J. Carrol Naish
as Collins
Bob Kortman
as Bracken
Lafe McKee
as Stephen Gray
Edward Hearn
as Sheriff
Kernan Cripps
as Tom
Edward Peil Sr.
as Andrew Martin
