House of Dracula (1945)

Director: Erle C. Kenton
Cast: Glenn Strange, Jane Adams, John Carradine, Lionel Atwill, Lon Chaney Jr., Ludwig Stössel, Martha O'Driscoll, Onslow Stevens

Synopsis:

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.