German scientist Paul Ehrlich makes remarkable advancements in the field of medical diagnostics with his research in cellular staining with dyes. His work results in new knowledge about tuberculosis, but also leads to his contraction of the disease. Ehrlich travels to Egypt, where he investigates diphtheria and earns more accolades. Eventually, his research in treating diseases leads to the development of a 'magic bullet' treatment for syphilis.

Genres

Cast

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