75,00,000 years ago, Xenu headed the Galactic Federation, which was an organization of 76 planets that had already existed for 20,000,000 years. The planets were suffering a tremendous problem with overpopulation. Xenu's draconian solution to the matter was to gather large numbers of people, k**l them, freeze their thetans (souls), and transport the frozen thetans to Earth, which they called Teegeeack. The thetans were left in the vicinity of volcanoes, which were, in turn, destroyed in a series of nuclear explosions.
Members of the galactic Federation eventually rebelled against Xenu, fighting him for six years before he was finally captured and imprisoned on a planet that today is barren desert. Within the "mountain trap" on this unnamed world, Xenu still lives. But, Xenu is planing his escape from his desert tomb, and planing to return to earth to take back his rightful place as ruler of our galaxy.