Cows

The cows of South Park were getting turned inside out by Vistors because of a mistake by Carl, one of the visitors that was new. When they tried to take a train out of South Park they were chased by Officer Barbrady. The Visitors then meet them and said that after expirementing with all the species of earth they thought that cows were the most intelligent. They gave them some technology that turned anyone they wanted into somekind of singer.