The Simpsons Season 9 Episode 17 - Lisa the Simpson Episode Title:Lisa the Simpson.Episode Description:Soon after being unable to solve a brain-teaser that several others at school were able to solve, and forgetting some of her day to day tasks, Lisa learns from Grampa that the Simpsons have a long history of losing their intelligence in late childhood. Lisa soon realizes that she cannot escape genetics, and accepts that she will soon be very unintelligent. After realizing the importance of sharing what you can with the world while you still have the chance, she lies her way onto a news broadcast to deliver a message on treasuring your brain. Homer sees this and, upon learning what Abe told her, attempts to disprove the theory of the "Simpson gene" by gathering every Simpson in the area together to showcase their merits. It is quickly apparent that Homer did not research this project much, as many of his guests prove to be simpletons, deadbeats, and stooges. Lisa's salvation only comes when she begins to meet the Simpson women, including a doctor who then informs Lisa that the defective "Simpson gene" is located only on the Y-chromosome. Re-validated, Lisa celebrates that she is once again herself, an event aptly crowned when she finally manages to solve the brain-teaser that so plagued her.[4] Meanwhile, Apu finds out that Jasper has locked himself inside a freezer at the Kwik-E-Mart and decides to turn it into a freak house.