Stan Marsh (center - left), Kyle Broflovski (center - center), and Eric Cartman (center - right)
Eric Cartman is a character from the television show South Park
He was seen when Bart and Milhouse were watching his show. During the episode an O. J. Simpson riot broke out at Eric's school. His severed head was shown on the show, thus he is presumably dead.
Nelson once dressed as him, while waiting at a bus stop.
During the song "High to Be Loathed", Mr. Burns mentions Eric Cartman, and makes his shadow, among lots of other villains.
 Behind the Laughter
Eric Cartman is one of the foul-mouthed, main protagonists on the animated series South Park.