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This lecture discusses personifications of evil in the Hebrew Bible and in early Christian belief, showing how Jewish apocalyptic demonology shaped Western thought in this area. It then considers the depiction of the malevolent alien in both popular culture and in UFO religions, showing how both owe much to the history of Christian demonology, despite the origins of much of the latter in theosophical thought, and concludes with a discussion of the reptilian agendas of certain other contemporary belief systems.