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Definition of Xenu
1. Proper noun. (Scientology) An extraterrestrial galactic leader in the Scientology belief system. Once reaching Operating Thetan level III, Scientologists are taught that 75 million years ago, Xenu transported aliens to Earth and murdered them with hydrogen bombs at sites of volcanoes, turning them into thetans, which purportedly cause human problems today. ¹
¹ Source: wiktionary.com