The Master Key

Milburn Stone

Agent Tom Brant

Jan Wiley

Janet Lowe

Dennis Moore

Jack Ryan

Addison Richards

Gerhard Doenitz / Garret Donahue

Byron Foulger

Prof. Elwood Henderson

Maris Wrixon

Dorothy Newton

Sarah Padden

Aggie

George Lynn

Herman

Russell Hicks

Police Chief Michael J. O'Brien

Roland Varno

Arnold Hoffman

Lash LaRue

Migsy

Jerry Shane

Dan

Neyle Morrow

Spike

John Eldredge

Walter Stark

Morgan Cox

Producer

George H. Plympton

Screenplay

Ray Taylor

Director

William A. Sickner

Director of Photography

Dale Van Sickel

Stunts

Tom Steele

Stunts

Chuck Hamilton

Stunts

David Sharpe

Stunts

Ace Herman

Editor

Maury Gertsman

Director of Photography

Carl Mathews

Stunts

Jack Natteford

Story

Dwight V. Babcock

Story

Lewis D. Collins

Director

Ande Lamb

Screenplay

Joseph O'Donnell

Screenplay

Irving Birnbaum

Editor

Ken Terrell

Stunts

Alvin Todd

Editor

Jack Dolan

Editor