The boys are forced to join a choir sent to Costa Rica to perform against deforestation as punishment for their rude behavior. Still, they end up lost in the rainforest and discover that it isn't worth saving. Meanwhile, Kenny falls for a girl in the chorus, but she is reluctant to pursue a long-distance relationship.
Randy must find out why the citizens of South Park are suddenly spontaneously combusting. Meanwhile, Cartman plays Jesus in a "Stations of the Cross" play and ends up stuck on the cross.
When Chef gets engaged to a strange woman, the boys are convinced that Chef's fiancée is a demon bent on sucking the life out of men. Meanwhile, Cartman becomes the butt of several pranks by his eye doctor.
The town saves a species from extinction, but finds that they are an extremely annoying race that only Cartman can stand.
Stan, Kyle, Cartman, and Kenny pit Tweek and Craig against each other. Meanwhile, the school shop teacher, Mr. Adler, copes with the loss of his wife, who died in a plane crash.
A man in a panda costume is hired to teach the kids about sexual harassment, leading Cartman to sue Stan (and all the kids to sue the school) over claims of being harassed.
Cartman is stuck at home with Stan's sadistic sister, Shelley, as his babysitter while his mom is at a meteor shower party. Meanwhile, Cartman's cat, Mr. Kitty, is in heat and goes searching for sex with other cats.
At the meteor shower party mentioned in the previous episode, Stan is stuck in a basement with Pip, Butters and Dougie from school who become important to him when the ATF stakes out the party, thinking that the attendees will commit suicide when the meteor comes. Meanwhile, Randy feels uncomfortable after he and Gerald watch each other masturbate in a hot tub.
On the night of the aforementioned meteor shower, Kyle, Kenny, and Ike go to a Jewish scout camp where Moses appears.
Nu metal band Korn guest stars in this episode, where they are blamed for making Halloween immoral, and the boys use Kyle's grandmother's corpse to scare the sixth graders.
The boys become fascinated with the latest fad from Japan, which turns out to be an insidious plot to have American children brainwashed into overthrowing the U.S. government.
A homeschooled boy decides to start at public school, much to his overprotective parents' fear. Meanwhile, Kyle falls for the boy's sister.
The boys must save Starvin' Marvin from the government and a Christian group who cares more about converting people from third-world countries than giving them food and shelter.