Question: "Cartman's Mom Is a Dirty Slut" is the first season finale of the American animated television series "South Park", during the episode, Stan, Kyle and Kenny participate on "America's Stupidest Home Videos", after filming Cartman playing in his yard with plush toys, Kyle Broflovski, is a main character in which TV organization series "South Park"?
Sentence (from "Cartman's Mom Is a Dirty Slut"): Meanwhile, his friends Stan, Kyle and Kenny participate on "America's Stupidest Home Videos", after filming Cartman playing in his yard with plush toys.
Relevant evidence: Yes