The Sweathogs remember how they tried to buy a used car from Vinnie's uncle.

A younger student begins to imitate Freddie, not much to Freddie's liking.

When Arnold finally shows back up at school, it's discovered that his absence was due to the recent death of his fifth father. A feeling of responsibility within him, Arnold sets out to find a job to help support his siblings and his mother, who's only priority lies in finding a replacement father for her kids.

When Carvelli and Murray come on as exchange students, Carvelli seemingly goes crazy with stories of aliens.

The Sweathogs opt to change Mr. Woodman's tired old school song.

Convinced that the school newspaper is too dull, Juan sets out to turn it into a tabloid, bringing down his friends' names in the process.

Beau plays a number or pranks on Mr. Woodman.

The characters in Mr. Woodman's new novel seem to have an awful lot in common with the Sweathogs...

Vinnie is saddened when his new coat is stolen.

Juan asks Vinnie to marry his immigrant cousin.

Mr. Kotter takes the sweathogs on a field trip to a museum. Mrs. Kotter and Mr. Woodman are along as chaperones. They meet the unusual museum curator Mr.Gore (John Astin) who seems odd and superstitious. In the Egyptian display, he warns them of the mummy coming back to life if they joke and kid around. Naturally, the door shuts itself and everyone is trapped. They humorously begin to panic and make attempts to get out. Epstein manages to get the door open.

When Mr. Woodman comes to Vinnie's hospital for an operation, Vinnie loses him and he and the other Sweathogs try to find him.

The gang is liable to get in trouble when the x-rated film Carvelli brought into school is accidentally mixed up with a film on sexual education.

Mr. Woodman's niece Kelly is babysitting for the Kotters when Juan drops by the apartment. The two abruptly fall in love and decide to move in together, but the romance begins to crumble when it seems that they can't respect one another's interests.

A new girl joins the Sweathogs.

After performing mouth-to-mouth resuscitation on a female student who has passed out in the classroom, Gabe is accused of molestation, and is in danger of losing his job.

Arnold gets upset when the other Sweathogs tease him about not being able to provide for Mary, and he vanishes. Mary finds him and convinces him not to worry, and the two get married.

While Horshack adjusts the married life, Epstein sets up an interview for a job. Washington gets the job before Epstein, unaware that it's the same job. The two get into a fight and end up in a gym ready to box.

Sparked by the fact that Vinnie neglected to do Freddie's homework, the Sweathogs spend the better part of class fighting with one another.

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

With Gabe away at a teacher's convention, the Sweathogs take it upon themselves to watch over the pregnant Julie...but the harder they try to make Julie comfortable, the more trouble they seem to cause.

Everybody helps Vinnie cram for a make-up test.

Arnold, saddened by the rejection he keeps recieving from the opposite sex, gets advice and comfort from Julie before quickly falling in love with her.

Gabe is afraid to get a physical when the free clinic comes to Buchanan High.

Julie's visiting sister, recently at odds with her long-time boyfriend, falls for Juan.