I didn't realize that Scientology was, more or less, based upon Alien Visitors. Scientology was started by L. Ron Hubbard in 1952 (the word means"the study of truth" in Latin), and is based on a belief--like many other religions--that man is"an immortal, spiritual being."
Scientology believes that man's abilities are unlimited. No one is asked to believe or accept anything. "That which is true for you is what you have observed to be true."
In Scientology, The Thetans are immortal beings attached to human bodies that span multiple lifetimes. All humans consist of the body, the mind, and the Thetan itself, "which is the spirit, or you." Scientologists believe that the Thetans are the foundation of all human beings.
75 million years ago, Xenu, the alien leader of the Galactic Confederation, came to Earth to drop off a large number of alienns. They set off a hydrogen bomb, which fused the Thetans to whatever was left of the humans after the H-bomb blast.
The Scientologists, by the way, do not believe in psychology or psychiatry. This is not completely shocking coming from a group that believes humans are the children of an H-bomb, cavemen, and a horde of aliens.
As you know, the church has a passel of celebrities as members. Four that come to mind are John Travolta, Tom Cruise, Katie Holmes, and Kirstie Alley.