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... Read allHank 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.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.
Guinn 'Big Boy' Williams
- Bill 'Jellybean' Cook
- (as 'Big Boy' Williams)
Edward Peil Sr.
- Andrew Martin
- (as Edward Peil)
Horace B. Carpenter
- Express Agent [Ch. 3]
- (uncredited)
Edward Cecil
- Mine Engineer [Ch. 1, 7]
- (uncredited)
Jack Cheatham
- Henchman [Ch. 7]
- (uncredited)
Richard Cramer
- Mine Lookout
- (uncredited)
