The Mystery Squadron

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.

• Colbert ClarkDirector
• David HowardDirector
• Sherman L. LoweScreenplay
• Al MartinScreenplay
• Barney A. SareckyScreenplay
• Colbert ClarkScreenplay
• David HowardScreenplay
• Wyndham GittensScreenplay

• Bob SteeleFred Cromwell
• Guinn 'Big Boy' WilliamsBill 'Jellybean' Cook
• Lucile BrowneDorothy Gray
• Jack MulhallHenry 'Hank' Davis
• Purnell PrattLafe Johnson
• Robert FrazerDr. Flint
• J. Carrol NaishCollins
• Bob KortmanBracken
• Lafe McKeeStephen Gray
• Edward HearnSheriff
• Kernan CrippsTom
• Edward Peil Sr.Andrew Martin