The Return of Doctor X (1939)

The Return of Doctor X is a 1939 science fiction horror film starring Wayne Morris, Rosemary Lane, Humphrey Bogart, and Dennis Morgan. The film is a sequel to the 1932 horror film Doctor X.

Plot
A reporter and a young doctor work together to solve a series of murders and a mysterious sample of synthetic blood

Cast

 * Humphrey Bogart as Marshall Quesne
 * Rosemary Lane as Joan Vance
 * Wayne Morris as Walter Garrett
 * Dennis Morgan as Michael Rhodes
 * John Litel as Dr. Francis Flegg
 * Lya Lys as Angela Merrova
 * Huntz Hall as Pinky
 * Charles C. Wilson as Detective Roy Kincaid
 * Vera Lewis as Miss Sweetman
 * Howard Hickman as Chairman