A scientist working on cures for rare afflictions, such as a bone softening agent made from molds to allow him to correct the spinal deformity of his nurse, finds the physical causes of lycanthropy in wolf-man Larry Talbot and of vampirism in Count Dracula, but himself becomes afflicted with homicidal madness while exchanging blood with Dracula.

Cast:John Carradine, Onslow Stevens, Lon Chaney Jr., Martha O'Driscoll, Jane Adams, Lionel Atwill,

Genre:Horror, Science Fiction,

country:United States of America,

Production:Universal Pictures,