The eighteenth season of The Simpsons aired in 2006 - 2007.
"The Mook, The Chef, The Wife, and Her Homer"
Fat Tony invites the Simpson family to his house for dinner after Lisa is nice to his son, Michael. After Michael announces that he wants to be a chef instead of following in his father’s footsteps, a rival family kills Fat Tony. Homer takes over as the new head until Michael schemes to stop him after not liking how the Simpson family has been acting.

"Jazzy and the Pussycats"
After being prescribed to play the drums during psychotherapy, Bart becomes a better drummer than Lisa, who turns to rescuing stray animals. After a pet tiger attacks Bart’s drumming arm, he holds a concert to pay for it to be repaired, but eventually decides to donate the money to an animal shelter,

"Please Homer Don't Hammer 'Em"
When Marge makes customers think that Homer, a male, is performing the carpentry work that she, a female, is actually doing in order to get initial business, Homer takes the credit for her work. Marge leaves the business just before Homer must restore a historic roller coaster. Homer is asked to take the first ride. Meanwhile, Bart tries to benefit from Mr. Skinner’s peanut allergy.

"Treehouse of Horror XVII"

"Married to the Blob"
Homer begins eating hundreds of people after ingesting a blob from an asteroid. The town of Springfield puts him in charge of exterminating the homeless residents.

"You Gotta Know When to Golem"
After Bart steals a clay Golem, the family quickly becomes annoyed by him and makes a clay female Golem to deal with him.

"The Day the Earth Looked Stupid"
The residents of Springfield believe the War of the Worlds broadcast and create disaster. They then do not believe Kang and Kodos who actually do come to take over the town.

"G.I. (Annoyed Grunt)"
Homer, Marge and Grandpa wind up in basic training with the U.S. Army. The Army uses them as terrorists in a false military operation. They are mistaken as real terrorists when they escape to Springfield.

"Moe 'N' A Lisa"
The Simpsons and Moe go to Vermont for a literary conference after Lisa gets Moe’s poems published. After Moe does not to give any credit to Lisa, he must write his own poem and recite it at the conference.

"Ice Cream of Margie (With The Light Blue Hair)"
After being fired, Homer becomes an ice cream man. Marge has an art opening for her sculptures made out of Popsicle sticks, and Homer crashes his ice cream truck into the event, because the Mafia is chasing him.

"The Haw-Hawed Couple"
Nelson makes Bart his best friend and does not let him spend time with Milhouse. Meanwhile, Homer reads Lisa a fantasy book each night. When he keeps reading and sees that the ending is sad, he makes up a happier ending to read to Lisa.

"Kill Gil, Volumes I & II"
After Gil has lived with the Simpsons for a year, Marge kicks him out on Christmas Eve. Lisa holds a musical for Bart who avoided sweets for one year.

"The Wife Aquatic"
When the Simpsons visit Barnacle Bay, Marge’s childhood home, they find it in ruins. When Homer gets the residents to clean up the town, he accidentally sets the carousel on fire. He is sent out to sea with the fishermen, and is caught in a big storm.

"Revenge Is A Dish Best Served Three Times"
After Homer botches his attempt to get revenge on Cletus, the Simpsons talk about failed attempts at revenge. Marge tells about Homer going to jail after Moe sets him up in nineteenth century France. Lisa tells about nerds fighting back at school, which leads Milhouse to become a bully. Bart tells about the Red Revenger who is searching for the man who killed his parents.

"Little Big Girl"
Lisa lies about a Native American tribe being part of her family history for a school project on diversity and must take sensitivity training when she admits the truth. Bart thinks he got a girl pregnant by kissing her, and the couple decide to run away together to avoid telling the girls’ parents.

"Springfield Up"
Documentaries are done on each of the main citizens of Springfield’s. Homer tries to get the filmmaker to think that he is a millionaire.

"Yokel Chords"
Based on The Sound of Music, Lisa tutors Cletus’s seven children. After Krusty hears their singing, he signs them to be part of his show. Lisa and Cletus’s wife, Brandine, help get the children out of their contract. Meanwhile, Bart is required to see a psychiatrist after making up a scary story.

"Rome-Old & Juli-eh"
After Grandpa moves into the Simpson’s house, because Homer can not pay for his nursing home, he falls in love with Selma. They get married and live with each other, which does not go well.

"Homerazzi"
When Homer becomes a paparazzi in Springfield, the residents retaliate by selling a magazine with pictures of Homer.

"Marge Gamer"
Marge accidentally kills Marge’s character while they are both playing “Earthland Realms,” a fantasy game on the internet. Bart then forfeits his own character to bring back Marge’s character. Meanwhile, Lisa becomes overly competitive while playing soccer and takes advantage of Homer who is the referee.