Cult director Jess Franco applies his prodigious talents to the myth of Dr. Frankenstein (Dennis Price), who's on the brink of finishing his prototype for a new creature he's fashioned using the skin of several corpses. Competitor Dr. Cagliostro (Howard Vernon) takes the already-bizarre plans one step further by trying to use Frankenstein's creation to propagate an evil race. Frankenstein's daughter, however, stands in the way of his mad scheme.