These strange beings pop in and out of South Park all the time, and can be seen frequently hiding around town. As we learned in "Cancelled" (704), the Visitors actually work for the intergalactic TV production company, Nerzod Productions -- creator of the top reality show in the galaxy, "Earth". In fact, the big satellite dish placed in Cartman's ass is just one of some 50,000 that have been placed in rectums across the world to help broadcast the reality show. These alien Visitors are just hanging around to make repairs and make sure everything is running smoothly.
Season 14: Coon vs. Coon & Friends
The Dark Lord is agitated and the Coon calms him down.