After a group of young revolutionaries break into a company’s corporate headquarters and steal $5,000,000 worth of heroin to keep it off the street, they call on San Francisco Police Lieutenant Virgil Tibbs for assistance.

After a dying Voodoo queen chooses an adopted apprentice as her successor, her true heir is outraged. Seeking revenge, he buys the bones of Blacula the vampire off of a dealer, and uses voodoo to bring the vampire back to do his bidding. In turn, Blacula turns him into a vampire and makes him his slave. Meanwhile, a police officer with a large collection of African antiques and an interest in the occult investigates the murders caused by Blacula and his vampire horde.

Hotheaded laborer B.J. Hammer can’t go long without ending up in a fight, and, after he comes out on top in a particularly impressive workplace scuffle, word of his brawling skills makes its way to Davis, a top boxing manager. Hammer is hired by Davis and begins a lucrative career in the ring, only to find out that his new employer wants him to throw a fight and take part in other illicit activities. Hammer reacts to this news violently, and the feud is on.