William Dieterle
Director

Edward G. Robinson
Dr. Paul Ehrlich Ruth Gordon
Mrs. Ehrlich Otto Kruger
Dr. Emil Von Behring Donald Crisp
Minister Althoff Maria Ouspenskaya
Franziska Speyer Montagu Love
Professor Hartmann Sig Ruman
Dr. Hans Wolfert Donald Meek
Mittelmeyer Henry O'Neill
Dr. Lentz Albert Bassermann
Dr. Robert Koch Edward Norris
Dr. Morgenroth Harry Davenport
Judge

Norman Burnstine
Screenplay James Wong Howe
Director of Photography Warren Low
Editor Max Steiner
Original Music Composer Heinz Herald
Screenplay John Huston
Screenplay Robert B. Lee
Sound