The "Church" calls these humanoid souls "BodyThetans".
You think I'm kidding?
Well then, allow me to prove it. Beyond any doubt. Click here to read three pages of these teachings. Scientology tried to remove them from the internet by lawsuits.
The cult sued 15 Internet Service Providers (NL) and the Dutch writer Karin Spaink from 1996 to 2006 because of copyright infringement. It lost all four cases (including the final suit in the Dutch Supreme Court). There was, and is, no doubt that the disputed texts were witten by Lafayette Ronald Hubbard®, the founder of the Scientology cult.
Although lawsuits aren't funny, it sure is funny to see to what length Scientology goes to prove that it is the lawfull owner of these silly teachings.
Or more precisely: about how to exorcize them...
And that's all dedicated Scientologists do - for the rest of their lives...
This exorcizing is called "The Bridge to Total Freedom".
The 1995 price-list of the courses that will ultimately learn you how to become a skilled BodyThetan exorcist can be found here.
A few documents however are still on-line, see below.
To make the reduction good, a bit, 250
On this page (in the Dutch section) there are hyperlinks to some other ("confidential") English Scientology documents.