Descendents of aliens from the planet Mormog, whose mothership crash-landed in the middle of what is known today as Salt Lake City, Utah. In an attempt to fit in, they adopted the dominant religion, Christianity, and twisted certain aspects around to suit their alien ways of life. The main compartment of the ruined craft survived however. It is buried approximately a mile underneath their greatest temple, and is heavily guarded by purposely grown (and carefully trained) biological monstrosities. The reason for all this security is that the craft harbors advanced mind-warping technology. Should they ever bring their advanced alien science into light, Mormons could tear the very fabric of Western society. Every non-Mormon mind would be enslaved to a great machine - an undetected, disembodied entity hidden (like the preserved remains of their ship) underneath their great temple - and forced to do their bidding. Those who resist would be exterminated via their lethal, telepathic powers. You have been warned.
The Osmonds are Mormons.