Baffled by a string of murders unconnected save for the victims' rare blood type, reporter Walter Garrett (Wayne Morris) turned to doctor buddy Michael Rhodes (Dennis Morgan) for consult. Their trail led to the supposedly late hematologist Maurice Xavier (Humphrey Bogart), revived through unholy experiments--and requiring the precious plasma to survive. Bogey's sole horror outing, unrelated to 1932's "Doctor X," also stars Rosemary Lane, John Litel, Huntz Hall. 62 min. Standard; Soundtrack: English DTS HD mono Master Audio; Subtitles: English (SDH).