Journey into Medicine is a 1947 American documentary-style film. The film stars James Karen as Michael Kenneth Marshall, a young medical student who goes through medical training at Columbia and Cornell. During his internship in pediatrics, Marshall loses one of his patients, a young girl to diphtheria. This case inspires him to enroll in the Johns Hopkins School of Public Health and pursue a career in public health. While studying at Johns Hopkins, Marshall helps battle an outbreak of diphtheria in Baltimore, which confirms to him his chosen vocation.