- Albert Bassermann - Dr. Robert Koch
- Edward Norris - Dr. Morgenroth
- Harry Davenport - Judge
- Louis Calhern - Dr. Brockdorf
- Louis Jean Heydt - Dr. Kunze
- Charles Halton - Sensenbrenner
- Irving Bacon - Becker
- Douglas Wood - Speidler
- Theodore von Eltz - Dr. Kraus
- Hermine Sterler - Miss Marquardt
- Louis Adlon - Hospital Attendant
- Herbert Anderson - Medical Assistant
- Louis V. Arco - Dr. Bertheim
- Egon Brecher - Martl
- Cliff Clark - Haupt
- Gretl Dupont - Mother
- Lisa Golm - Nurse
- John Hamilton - Hirsch
- Ludwig Hardt - Court Clerk
- Wilfred Hari - Dr. Hata
- Paul Harvey - Defense Attorney
- Ernst Hauessermann - Hans Weisgart
- Stuart Holmes - Male Nurse
- Frank Jaquet - Banker
- Frank Lackteen - Arab Man
- Rolf Lindau - Patient
- Frank Mayo - Assistant in Hospital
- Greta Meyer - Female Nurse
- Torben Meyer - Kadereit
- Howard M. Mitchell - Dr. Virchow
- Norman Phillips Jr. - Stable Boy
- Paul Phillips - Patient
- Frank Reicher - Old Man
- Hedwiga Reicher - Nurse
- Walter O. Stahl - Doctor
- Robert R. Stephenson - Merk - Patient
- Robert Strange - Koerner
- Ann E. Todd - Marianne
- Brandon Tynan - Doctor
- Wilhelm von Brincken - Officer
- Gisela Werbisek - Mother
- Wolfgang Zilzer - Kellner
- William Dieterle
- John Huston
- Hal B. Wallis
- Max Steiner
Capítulo disponible en las siguientes plataformas:
