Edward Van Sloan, Josephine Hutchinson, Paul Muni, Anita Louise
French chemist and microbiologist Louis Pasteur is on a quest to cure the ailments of the 19th century. But he's thwarted at every turn by skeptical fellow scientists, chief among them Dr. Charbonnet. He draws scorn when he supports the germ theory, advocating that doctors should wash their hands and sterilize their instruments before working on patients. But Pasteur perseveres, and when anthrax becomes a scourge, he holds the key to solving the epidemic.