Xenu

Etymology
From the works of, of origin. notes that a  science fiction comic story featuring an alien warlord titled “Xemnu the Titan” (1961) was reprinted in 1967, the year that Hubbard composed the Xenu narrative.

Proper noun

 * 1)  An extraterrestrial galactic leader said to have transported aliens to Earth 75 million years ago and murdered them with hydrogen bombs at sites of volcanoes, turning them into thetans.