
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.
Cast

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
Crew
Colbert Clark
Director, Screenplay
David Howard
Director, Screenplay
Wyndham Gittens
Screenplay
Barney A. Sarecky
Screenplay
Sherman L. Lowe
Screenplay
Al Martin
Screenplay
Earl Turner
Editor
William Nobles
Director of Photography

Alvin Wyckoff
Director of Photography
Ernest Miller
Director of Photography
Nat Levine
Producer
Terry Kellum
Sound Recordist
Lee Zahler
Music

Yakima Canutt
Stunts

George Magrill
Stunts
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