爱德华·罗宾逊
Edward G. Robinson
饰：Dr. Paul Ehrlich
鲁丝·戈登
Ruth Gordon
饰：Hedwig Ehrlich
奥托·克鲁格
Otto Kruger
饰：Dr. Emil Von Behring
唐纳德·克里斯普
Donald Crisp
饰：Minister Althoff
玛丽亚·彭斯卡娅
Maria Ouspenskaya
饰：Franziska Speyer
Montagu Love
Montagu Love
饰：Professor Hartman
Sig Ruman
Sig Ruman
饰：Dr. Hans Wolfert
唐纳德·米克
Donald Meek
饰：Mittelmeyer
亨利·奥尼尔
Henry O'Neill
饰：Dr. Lentz
艾尔伯特·贝瑟曼
Albert Bassermann
饰：Dr. Robert Koch
爱德华·诺里斯
Edward Norris
饰：Dr. Morgenroth
哈里·达文波特
Harry Davenport
饰：Judge
路易斯·卡尔亨
Louis Calhern
饰：Dr. Brockdorf
路易斯·让·埃特
Louis Jean Heydt
饰：Dr. Kunze
查尔斯·霍尔顿
Charles Halton
饰：Sensenbrenner
欧文·培根
Irving Bacon
饰：Becker
道格拉斯·伍德
Douglas Wood
饰：Speidler
西奥多·范·艾尔兹
Theodore von Eltz
饰：Dr. Kraus
Hermine Sterler
饰：Miss Marquardt
Louis Adlon
饰：Hospital Attendant (uncredited)
赫伯特安德森
Herbert Anderson
饰：Medical Assistant (uncredited)
路易斯 V.阿尔科
饰：Dr. Bertheim (uncredited)
埃贡·布雷赫尔
Egon Brecher
饰：Martl (uncredited)
克利夫·克拉克
Cliff Clark
饰：Haupt (uncredited)
Gretl Dupont
饰：Mother (uncredited)
丽萨戈尔姆
Lisa Golm
饰：(uncredited)
约翰·汉密尔顿
John Hamilton
饰：Hirsch (uncredited)
Ludwig Hardt
饰：Court Clerk (uncredited)
Wilfred Hari
饰：Dr. Hata (uncredited)
保罗·哈维
Paul Harvey
饰：Defense Attorney (uncredited)
恩斯特·豪舍曼
Ernst Hausman
饰：Hans Weisgart (uncredited)
John Henrick
John Henrick
饰：Dr. Bucher (uncredited)
斯图尔特·霍姆斯
Stuart Holmes
饰：Male Nurse (uncredited)
弗兰克贾奎特
Frank Jaquet
饰：Banker (uncredited)
Frank Lackteen
饰：Arab Man (uncredited)
Rolf Lindau
饰：Patient (uncredited)
弗兰克·梅奥
Frank Mayo
饰：Assistant (uncredited)
Frederic Mellinger
饰：Court Stenographer (uncredited)
Greta Meyer
饰：Female Nurse (uncredited)
Torben Meyer
饰：Kadereit (uncredited)
Howard M. Mitchell
饰：Dr. Virchow (uncredited)
Norman Phillips Jr.
饰：Stable Boy (uncredited)
Paul Phillips
饰：Patient (uncredited)
弗兰克·瑞切尔
Frank Reicher
饰：(uncredited)
Hedwiga Reicher
饰：Nurse (uncredited)
Elaine Renshaw
Elaine Renshaw
饰：Arab Woman (uncredited)
Walter O. Stahl
饰：Doctor (uncredited)
Polly Stewart
Polly Stewart
饰：Steffi (uncredited)
Rolla Stewart
Rolla Stewart
饰：Steffi (uncredited)
Robert Strange
饰：Koerner (uncredited)
安·E·托德
Ann E. Todd
饰：Marianne (uncredited)
Brandon Tynan
饰：Doctor (uncredited)
Wilhelm von Brincken
饰：Officer (uncredited)
Gisela Werbisek
饰：Mother (uncredited)
Wolfgang Zilzer
饰：Kellner (uncredited)
Robert R. Stephenson
Bonnie Gaye Cowen