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From the liner notes

Judith Fontaine (Regina Carrol) is looking for her sister Joanie, who has disappeared into the hippie community of Venice, California. It turns out Joanie has become the victim of Groton (Lon Chaney Jr.), an axe-wielding homicidal maniac. Dr. Durray (J. Carrol Naish) is really the last of the Frankensteins and is now running a house of horrors by the beach and performing experiments on Groton's victims. One night Count Dracula (Zandor Vorkov) visits the doctor, showing him the original Frankenstein creation that was buried in a nearby graveyard. The doctor revives it and uses it to take revenge on his professional rivals.