Kotter begins to behave erratically when he learns that Julie will be going on a weekend ski trip, marking the first time that they've been separated since their marriage.

Instead of the planned food fight, Kotter convinces the Sweathogs to stage an all night classroom sit-in to protest the school's serving of liver for lunch.

The class votes to make Freddie the new leader of the Sweathogs, making Vinnie so upset that he quits school and stays with the Kotters. But Julie is growing tired of the Sweathogs taking all of Gabe's time.