From Wikipedia (http://en.wikipedia.org/wiki/Xenu http://en.wikipedia.org/wiki/Xenu): Xenu, also spelled Xemu, was, according to Scientology founder L. Ron Hub

From Wikipedia (http://en.wikipedia.org/wiki/Xenu http://en.wikipedia.org/wiki/Xenu): Xenu, also spelled Xemu, was, according to Scientology founder L. Ron Hubbard, the dictator of the "Galactic Confederacy" who, 75 million years ago, brought billions of his people to Earth (then known as "Teegeeack") in a DC-8-like spacecraft, stacked them around volcanoes and killed them using hydrogen bombs. Official Scientology scriptures hold that the essences of these many people remained, and that they form around people in modern times, causing them spiritual harm.