A look at the relationship between Mike Wazowski and James P. Sully Sullivan during their days at Monsters University, when they weren't necessarily the best of friends.

While performing in Springfield, the band Green Day perishes when the lake's pollution dissolves their barge, following an audience revolt after frontman Billie Joe Armstrong proposes an environmental discussion. At their memorial, Grampa Simpson foresees the destruction of the town, but only Marge takes this seriously. Later that day, Homer dares Bart to skateboard naked to Krusty Burger and Bart ends up arrested. Bart considers their neighbor Ned Flanders a better father after Homer refuses to take responsibility for the incident. Meanwhile, Lisa and her new friend convince the entire town to clean their lake.