"True story of the doctor who considered it was not immoral to search for a drug that would cure syphilis."
Edward G. Robinson
as Dr. Paul Ehrlich
Ruth Gordon
as Mrs. Ehrlich
Otto Kruger
as Dr. Emil Von Behring
Donald Crisp
as Minister Althoff
Maria Ouspenskaya
as Franziska Speyer
Montagu Love
as Professor Hartmann
Sig Ruman
as Dr. Hans Wolfert
Donald Meek
as Mittelmeyer
Henry O'Neill
as Dr. Lentz
Albert Bassermann
as Dr. Robert Koch
Edward Norris
as Dr. Morgenroth
Harry Davenport
as Judge
Louis Calhern
as Dr. Brockdorf
Louis Jean Heydt
as Dr. Kunze
Charles Halton
as Sensenbrenner
Irving Bacon
as Becker
Douglas Wood
as Speidler
Theodore von Eltz
as Dr. Kraus
Hermine Sterler
as Miss Marquardt
Louis Adlon
as Hospital Attendant
Herbert Anderson
as Medical Assistant
Louis V. Arco
as Dr. Bertheim
Egon Brecher
as Martl
Cliff Clark
as Haupt
Gretl Dupont
as Mother
Lisa Golm
as Nurse
John Hamilton
as Hirsch
Ludwig Hardt
as Court Clerk
Wilfred Hari
as Dr. Hata
Paul Harvey
as Defense Attorney
Ernst Hauessermann
as Hans Weisgart
John Henrick
as Dr. Bucher
Stuart Holmes
as Male Nurse
Frank Jaquet
as Banker
Frank Lackteen
as Arab Man
Rolf Lindau
as Patient
Frank Mayo
as Assistant in Hospital
Frederic Mellinger
as Court Stenographer
Greta Meyer
as Female Nurse
Torben Meyer
as Kadereit
Howard M. Mitchell
as Dr. Virchow
Norman Phillips Jr.
as Stable Boy
Paul Phillips
Frank Reicher
as Old Man
Hedwiga Reicher
Elaine Renshaw
as Arab Woman
Walter O. Stahl
as Doctor
Robert R. Stephenson
as Merk - Patient
Rolla Stewart
as Steffi
Robert Strange
as Koerner
Ann E. Todd
as Marianne
Brandon Tynan
Wilhelm von Brincken
as Officer
Gisela Werbisek
Wolfgang Zilzer
as Kellner
William Dieterle
Director
John Huston
Screenplay
Heinz Herald
Norman Burnstine
Max Steiner
Original Music Composer
James Wong Howe
Director of Photography
Warren Low
Editor
Wolfgang Reinhardt
Associate Producer
Hal B. Wallis
Executive Producer
Carl Jules Weyl
Art Direction
Howard Shoup
Costume Design
Perc Westmore
Makeup Artist
Al Alleborn
Unit Manager
Irving Rapper
Assistant Director
Jack Sullivan
Armor Marlowe
Props
Robert B. Lee
Sound
Robert Burks
Special Effects
