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The film begins in a parlor, where Mary Shelley, Lord Byron and Percy Shelley are having a chat. As they discuss the story of Frankenstein's Monster, Mary reveals that this was not the end of the creature.
The narrative then shifts to the burning mill from the first film. After the burgomaster has sent all the people home only an old couple, the parents of the murdered girl Maria, are left. The husband falls down into the ruins of the mill where he discovers that the Monster is still alive. Driven by revenge, the Monster kills him and his wife. Meanwhile Frankenstein is brought home to recover. There he is visited by his old teacher Dr. Pretorius, who urges him to continue his experiments. Pretorius brings Frankenstein to his own lab, where he shows him his own creations: five miniature men whom he keeps in glass jars. Now Pretorius' aim is to build a bride for the monster in order to "create a man-made race". Meanwhile the Monster is loose in the woods. There he spots a beautiful shepherdess and approaches her. The frightened girl cries out and falls into a lake, but is saved from drowning by the Monster. Summoned by the girl's cries, two hunters arrive and shoot at the Monster. Soon a new lynch mob is organised and captures the Monster. Killing several people, the Monster manages to escape again. In a hut in the woods he encounters a blind hermit, who is not afraid of the horrible creature. He feeds the Monster, tends to his wounds and even teaches him a few words. But this peaceful atmosphere does not last very long. Two hunters discover the strange couple and chase the Monster away. He then hides in a graveyard where he meets Pretorius, who is just about to steal some bodies. Together they drink wine and the Monster, pointing at a skull, asks him, "You make man like me?" But Pretorius has something better to offer, "No, woman, friend for you." The doctor then uses the Monster to kidnap Frankenstein's bride Elizabeth in order to make sure Frankenstein will co-operate. In Frankenstein's old laboratory they finally give life to their new creation, a woman made from dead body parts. The bride is so shocked by the Monster's horrible appearance that she rejects him. This final disappointment is too much for the Monster to take and he destroys Pretorius, the Bride and himself. Before the building collapses he proclaims, "You live! We belong dead!" and sets Frankenstein free to rejoin his wife Elizabeth.
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