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Michael and Donna and another couple, Paul and Erica, attend a seance at Count Yorga's Victorian mansion outside Los Angeles to summon Donna's deceased mother. During the seance Donna faints, and Count Yorga uses the occasion to hypnotize both Donna and Erica. The four leave Yorga's mansion, and Paul drives Michael and Donna to their homes. Afterwards, Paul's camper becomes bogged down in mud. He and Erica decide to spend the night in the camper rather than seek shelter in Yorga's mansion nearby, but in the night they are awakened by howling noises. Paul goes out to investigate and is knocked unconscious by a darkly clad figure. Soon thereafter, Erica becomes a victim of the vampire Count Yorga. The next day Paul finds Erica behaving strangely--she gesticulates wildly, knocks over furniture, and attempts to eat a live cat. Paul consults Dr. Hayes, who, after examining Erica, testing her blood for vampire venom, and noting the marks on her neck, swears that she has been bitten by a vampire. Erica and Donna are abducted by Yorga, and Paul goes to Yorga's mansion to search for them. Michael and Dr. Hayes become alarmed when Paul fails to return, but when they inform the police, the police believe the two are insane. Armed with wooden stakes, Michael and Dr. Hayes go to the mansion and find it swarming with vampires. Yorga has killed Paul. Dr. Hayes is attacked and killed, but Michael drives stakes into the hearts of Erica and Yorga and rescues Donna. He spirits her away, unaware that she too has become a vampire.