This painfully cheap but wildly entertaining PRC production stars a hammy George Zucco in a dual role as the Clayton Twins -- both doctors, one good, one evil. Elwyn Clayton, a practitioner of the black arts, is murdered by his brother Lloyd and returns from the dead as a vampire to seek revenge with the aid of his leering, hunchbacked assistant (Dwight Frye -- who else?). He exacts his vengeance by brutally murdering Elwyn's associates, with all evidence pointing to the only living twin. Jungle Siren director Sam Newfield makes the most of the paltry budget, helped greatly by Zucco's typically flamboyant performance -- which threatens to out-camp even that of legendary eye-roller Frye (who would die of a heart attack some months after this film's completion). ~ Cavett Binion, Rovi