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.
| Actor | Role |
|---|---|
 Bob SteeleFred Cromwell | Fred Cromwell |
 Guinn 'Big Boy' WilliamsBill 'Jellybean' Cook | Bill 'Jellybean' Cook |
 Lucile BrowneDorothy Gray | Dorothy Gray |
 Jack MulhallHenry 'Hank' Davis | Henry 'Hank' Davis |
 Purnell PrattLafe Johnson | Lafe Johnson |
 Robert FrazerDr. Flint | Dr. Flint |
 J. Carrol NaishCollins | Collins |
 Bob KortmanBracken | Bracken |
 Lafe McKeeStephen Gray | Stephen Gray |
 Edward HearnSheriff | Sheriff |
 Kernan CrippsTom | Tom |
 Edward Peil Sr.Andrew Martin | Andrew Martin |
 Jack MowerCarter | Carter |
 Jack PerrinRoberts | Roberts |