Lisa's Belly

At an abandoned water park (a parody of Action Park), Bart and Lisa contract a bizarre infection, requiring treatment from steroids that cause temporary weight gain. Before they go back to school, Marge calls Lisa "chunky" with affection, which causes her to be insecure about her weight. Marge takes Lisa to the mall, shopping for back-to-school clothes to make her feel better. She later says "flattering", making the word "chunky" grow bigger in Lisa's mind. Lisa gets cranky in front of the customers and workers, so Marge takes her home.

Hearing of the incident, Homer asks Lisa what is wrong and is horrified when she tells him Marge called her "chunky". He lets Patty and Selma take Lisa to the park where they describe how they no longer care what people think of them. Later, Marge apologizes to Lisa about what she said to her, but says words like "Normal" and "Perfect" to Lisa, making "Chunky" grow bigger and causing her more frustration. In the piano store, Luann tells Marge about a hypnotherapist named Dr. Wendy Sage, who had a mastectomy and chose not to have breast reconstruction surgery.

Lisa and Marge visit Sage, who uses hypnotherapy on them, transferring them to Lisa's mind. They see the "Chunky" word which takes up the entire space of her mind. They then travel to Marge's mind, where they discover that Marge's mother had said a hurtful word to her as a child: "plain". The word has been in her head for years. Realizing each other's insecurities, Marge and Lisa profess their love to each other, thus making "chunky" and "plain" shrink.

Meanwhile, when Bart's sleeve rips while playing basketball, Jimbo, Dolph, Kearney, and Nelson take him to an underground basement in school where they teach him to get into shape and become a man. When Bart sees the guys hanging around with their girlfriends, he feels betrayed, runs away from the basement and plays basketball with the other children.

During the credits, it is shown that there are words in everyone else's heads. Homer is shown as a child sleeping in a hammock with the many words he heard as a child (Lazy, dumb, stupid, fat, greedy) scattered around him. The scene changes to him as an adult, sleeping in the hammock, and the words have been replaced with empty beer cans and jars of peanuts in his hands.

The character of Wendy Sage was created and voiced by Renee Ridgeley, an actress, writer, and real-life breast cancer survivor and the wife of Simpsons writer Matt Selman who said: “While Sage has all the telltale signs of a breast cancer survivor: a visible scar from a port-o-cath (a device used to deliver chemotherapy), curly hair regrowing from chemo treatment, an obviously one-breasted appearance, and is visually concave on her mastectomy side, the episode does not focus on her past disease.''[2] "Sage shows up as exactly who she is now," she added. "By living openly as a one-breasted woman, she sends a message of acceptance and wholeness celebrated by individuals in marginalized groups."[2]

• "Lisa's Belly" at IMDb