A medical researcher is sent to a plague outbreak, where he has to decide priorities for the use of a vaccine.
Dr. Martin Arrowsmith
Leora Tozer Arrowsmith
Gustav Sondelius
Professor Max Gottlieb
Dr. Oliver Marchand
Twyford
Dr. Tubbs
Bert Tozer
Joyce Lanyon
Terry Wickett
State Veterinarian
Sir Robert Fairland
Pioneer (uncredited)
Cop (uncredited)
Mrs. Tozer (uncredited)
Miss Twyford (uncredited)
Nurse (uncredited)
Dr. Hesselink (uncredited)
Committee Member (uncredited)
City Clerk (uncredited)
