Cartman needs to find out who his father is but his mom is no help. Learning that his father could be one of the many people that his mom had "relations" with during an annual party called "The Drunken Barn Dance", he finds that there's more to his mother than he thought.

Dr. Mephisto is about to reveal who Eric Cartman's father really is! Glass shatters and gunshots ring out. A mysterious assailant apparently shot Mephisto while the lights were off. Much to Eric's chagrin, they rush Mephisto off to the hospital. Chef rushes out the door with Mephisto in hand. They must fight against time to learn Eric's background, who is his father? Where does he come from?

The Booktastic bus is in town and soon everyone finds out that Officer Barbrady can't read. He is whisked off to school with the boys so he can save his job. While he's there someone in South Park is having sex with the town's chickens and only Officer Barbrady with his new deputies Kenny, Kyle, Stan, and Cartman can stop them!

Kyle is injured and must go to see the school nurse and is terrified because of the stories he's heard. She looks fairly normal, except for the dead fetus sticking out of her head. Kyle's mother educates the boys on her "condition" and decides that everyone in South Park should be made aware. Meanwhile, the South Park Cows dodgeball team goes to the state, national and finally the international finals in China.

The kids go on a field trip to the planetarium. All of the children except Cartman are acting weird. As usual Stan and Kyle, with Kenny's sacrifice, try to get to bottom of the mystery. Meanwhile, Cartman wins an appearance on a snack commercial. The four boys get to the root of the strange planetarium.

South Park's annual "Cow Days" party is happening! The cows become transfixed on a cow statue. In order to get the money they need to win Terrance and Phillip dolls, the boys sign Cartman up for a bull riding contest. A freak accident has Cartman believing he is a Vietnamese prostitute named Ming Li. The boys learn about money and cow insanity.

Kenny spontaneously combusts. The mayor asks Randy Marsh to find a solution. The boys try to help Kyle's dad to get an erection. One way they think they can help is by performing the Stations of the Cross at church crucifying Cartman and waiting three days for his res-erection. Randy Marsh figures out the reason everyone is combusting is because they are withholding their farts.

The boys discover a live prehistoric Jakovasaur while camping on Stark's Pond. The government and the citizens of South Park are interested in trying to help keep this endangered species alive, until they all realize how annoying the Jakovasaurs really are. The only one who really enjoys them is Cartman. The boys try distracting him while the town tries to send the Jakovasaurs to France.

Stan's parents bring him to Mr. Mackey's party, but he gets sent down to the basement to be with the lame kids. Kyle and Stan's fathers experiment with their homosexual tendencies. The ATF is convinced that the meteor shower party is actually a gathering of a religious cult that is going to commit suicide when the meteor shower arrives. Stan tries to save himself and the party from the ATF.

Mrs. Cartman is about to give Eric a present. Of course Eric is hoping it will be some kind of toy, but it ends up being Hooked On Monkey Phonics to help him win the big South Park Annual Spelling Bee. Kyle finds Rebecca Cutswald to be quite intriguing and tries to woo her with his charm and teach her how to love and learn in public school.