Barbarino is running for Student Body President but his campain turns into disaster.

In order to bring up Vinnie's grades, Judy Borden, highly unpopular with the Sweathogs, is called in to tutor him. But when the two start liking one another, problems arise.

A flu epidemic hits Buchannan and everybody gets sick except for Kotter, Horshack and a few students in the other classes. In the end, the few healthy students team up with the remaining Sweathogs in the classroom.

Vinnie's grandmother's dying wish is for him to become a priest, and he takes the request seriously, until the strain of being holy becomes too much for him.

On career day, an inventor who is treated poorly by the Sweathogs offers a well-paying job to Gabe.

The Sweathogs form a gang, but won't let Arnold in until the night of their first rumble, and Arnold, against the idea of being killed, brings along Gabe and Mr. Woodman in order to prevent the fight.

A girl wants to ask Vinnie to the Sadie Hawkins Day dance, but his insensitivity leads her to ask Arnold in retaliation, leaving Vinnie with no date at all.

Epstein is caught smoking cigarettes. Gabe and the sweathogs try to get him to stop.

Tired of the way the school newspaper is always putting them down, the Sweathogs join the staff in order to redeem themselves; and the crack investigative team of ""Vinstein"" (Vinnie and Juan) are hot on the trail of the culprit behind the recent break-in of Principal Lazarus's office.

Gabe and Julie find out that they are going to have a baby.

Julie goes into labor.

Julie gives birth to twin girls.

Freddie cheats on an English test.

A new girl joins the Sweathogs.

At Christmas time, the gang reminisces over past episodes.

Arnold voices angst and pioneers for change on the school radio station, gathering fans in the process.

Juan buys four term papers - one for each Sweathog - from Carvelli, only to end up with an essay that Gabe had turned in eleven years earlier.