The episode is centered on Liane Cartman and Chef attempting to exorcise Kenny's soul while Stan tries to debunk self-proclaimed psychic John Edward, whom the entire crew of South Park Studios agreed to be "the biggest douche in the universe.
Upon hearing of all this, Chef decides to take everyone to the Crossing Over TV show in New York and have John Edward talk to Kenny from beyond the grave.
At the show, Edward merely makes uselessly vague statements about Kenny, and advises Kyle that his grandmother wants him to "look for four white doves."
About to fly back to Colorado, Kyle spots a poster advertising a school called Jewleeard, with four white birds as its logo.
Cartman returns to his normal self and Chef's parents give him the roast to take back to South Park.
Near the end of the episode a trailer is shown wherein Schneider finds the abandoned pot roast and eats it, thus allowing Kenny's spirit to possess him.
The running gag is that all of the fictional trailers follow the same basic plot: a man is somehow transformed, whether it be into an animal, a woman, a stapler, or a carrot.
The term derp that is used in one of the Rob Schneider trailers (and would later become a popular term on the Internet) was coined when South Park creators Trey Parker and Matt Stone were shooting the movie BASEketball; a derp is "a stupid joke that you could see a mile away," commenting on their criticism of Schneider's movies.