Prince Manuwalde is revived by a member of an American voodoo cult. Then he uses his power to bite many innocent people, but suddenly he falls in love with a beautiful woman- Lisa.
Blacula becomes something of a slave-master, even as he disdains humans who exploit other humans. 'You made a slave of your sister, and you're still slaves, imitating your slave masters!' he lectures a pair of pimps before tossing them through a window.
Blacula was a drama first and a horror and blaxploitation enterprise after that. Scream Blacula Scream is a blaxploitation horror film that takes its influence not just from its predecessor, but the burgeoning subgenre as the whole.