The Mystery Squadron

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Colbert Clark

Director

David Howard

Director

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 [Chs. 2-3, 12]

Kernan Cripps

Tom - Dam Foreman

Edward Peil Sr.

Andrew Martin

Jack Mower

Carter - Henchman

Jack Perrin

Roberts - Mystery Flyer

Horace B. Carpenter

Express Agent [Ch. 3]

Edward Cecil

Mine Engineer [Ch. 1, 7]

Jack Cheatham

Henchman [Ch. 7]

Richard Cramer

Mine Lookout

Al Martin

Writer

Barney A. Sarecky

Writer

Sherman L. Lowe

Writer

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