Lisa is failing gym. So that she won't fail and lose the Springfield Elementary the only accreditation they have, Principal Skinner gets Lisa a private coach. After seeing a vision of President Kennedy, Lisa is inspired to give gymnastics her best shot. While Bart is spending time with Grandpa he gets bitten by a Chinese mosquito. Lisa finds out that her fellow gymnastics students are actually college age, and rather than be embarrassed by her real age, she lets them think she is college age as well. Bart is diagnosed with "Panda virus" which makes him contagious, so Dr. Hibbert puts him in a plastic bubble for a week. Meanwhile Lisa has started hanging out with college age students at a coffee house listening to Robert Pinsky read his poetry. Bart starts using his plastic bubble to rescue nerds from the bullies. Some of those nerds follow Lisa when they think she is up to something. They find her at college analyzing "Itchy and Scratchy" cartoons and Milhouse exposes her. Embarrassed she leaves and back at home, she gets in trouble for going to college (16 credit hours worth) and her fellow grade school students won't relate with her anymore. She gets advice from Bart on how to win them back, which she does by making a splash on the cake created for Seymour Skinner Day.