Big Bang Theory, “The Cult Culture”

With his powers growing ever stronger, Howard convinces himself that he is not that of man, but rather a god. He forms a new religious cult, which Sheldon only joins when Howard insists that all incantations be recited in Klingon. When the Potato Penny joins the religion, Leonard follows suit in a desperate attempt to win her back. Raj—the only member of the group who is actually religious—grows concerned about this newfound religion, and calls in guest star Richard Dawkins to convince his friends that religion is stupid.