A slapdash epic of bad filmmaking geared strictly toward drive-in audiences, Dracula vs. Frankenstein has gone on to achieve cult status thanks to its sheer ineptness and impressive cast. At an oceanside amusement park, Dr. Frankenstein (J. Carrol Naish) runs a house of horrors that serves as a cover for his more devious scientific experimentation -- work that requires the murderous deeds of his mute assistant Groton (Lon Chaney Jr.). After stealing the corpse of Frankenstein's monster, Dracula visits the doctor and makes him an offer he can't refuse: resurrect the monster so that Dracula can use the beast to carry out his plan to take over the world. At the same time, lounge singer Judith (Regina Carrol) arrives at the park against the advice of detective Martin (Jim Davis) to search for her missing sister. She is drugged in a bar and winds up in the care of kindly stud Mike (Anthony Eisley), who takes up the investigation with her. Meanwhile, Dr. Frankenstein and Dracula resurrect the monster and immediately send it to kill the doctor's old enemy (Forrest J. Ackerman). Judith and Mike encounter the monster and, after a narrow escape, they confront Dr. Frankenstein who is beheaded in the ensuing melee. Sgt. Martin arrives in time to kill Groton before he attacks Judith, but not before Dracula kills Mike and takes Judith captive. He ties her up in the lab and prepares to bite her, but the monster goes mad, leading to a ferocious battle.