Now that Alex Gibney's new investigative documentary on Scientology, "Going Clear: Scientology and the Prison of Belief" is in limited release, everybody is talking about its bombshell revelations about the church.

One of the biggest is Scientologists' answer to how the universe began and the secret of life. The incredible story that Scientologists believe involves a galactic overlord by the name of Xenu, a volcano, and souls that attach themselves to newborn babies.

The story may sound familiar, either for those who have studied Scientology or viewers of "South Park."

Back in 2005, the creators of the Comedy Central show told the same story in their famous episode, "Trapped in the Closet."