Both the Physical Transformation of Humans into other creatures and the Werewolf Sub-genres have ancient roots that go back to the Mesopotamians and the Greeks. Often the modern stories of transformation are based on a scientific experiment gone wrong such as The Strange Case of Dr. Jekyll and Mr. Hyde and The Fly. In the case of Kafka's The Metamorphosis, the reader is never given a reason for the Grego Samsa's transformation into a cockroach. Like the Vampire, popular media, such as An American Werewolf in London and the Harry Potter series have transformed the werewolf from a vicious creature to a sympathetic being under a curse for which there is no release, except death.
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