Freddie becomes addicted to drugs after taking prescribed pain killers. Despite the other Sweathogs' best efforts, the only thing that can bring Freddie around is Arnold's faith in him...and in his ""vitamin pills.""

Gabe's overly-critical father comes for a visit and, unconvinced that his son has chosen a worthwhile career, goes with Gabe to school in order to watch him in action with his Sweathogs.

Rosalie ""Hotsy"" Totsy has grown up ... a little too fast. The Sweathogs go to a local strip club on a dare, and learn that Hotsy has gotten a job performing there (yup, she bares all, unknowingly in front of her former classmates). Vinnie, Freddie and Epstein all ride Hotsy's case, but Arnold is sensitive to her plight. Seems that, during a coversation with her former teacher Gabe, Rosalie really lived up to her nickname one night and got pregnant. And getting a job at a strip joint is the only way for this single mother (the baby's father had left Hotsy) to support her child. Gabe and Arnold convince the others to give Hotsy Totsy moral support, and they also refer her to a social agency which can help her finish school and find a more meaningful job.

Julie goes into labor.

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.

Juan, with the help of his uncle, hooks the Kotters up with a new apartment.

The Sweathogs and administrators at James Buchanan High reminisce about Gabe's past two years at the school. Past episodes are recalled through flashbacks.

The art teacher falls in love with Gabe.

A flashback recalls Gabe's first meeting with his class. The Sweathogs Out Debate A Superior Class.

Gabe announces that he is now the vice-principal and Mr. Woodman is the principal. The Sweathogs are pleased, until Gabe gets strict. After Vinnie visits the school to tell the gang he's dropped out, the other Sweathogs decide to follow in his footsteps.

Kotter has a dream about life when the Sweathogs are old.

Julie's parents come to see the babies.

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.

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.

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.

At Christmas time, the gang reminisces over past episodes.

Julie gives birth to twin girls.

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.

Gabe, in need of money for a root canal, takes a second job as a restaurant mascot.

At Christmas time, the Sweathogs are all too eager to tease resident bum Angie. But after Angie tells his life story to the class, they have a change of heart, and decide to help him get back up on his feet.

The sweathogs out debate a smarter debate class.

It seems that Freddie has a future in radio, but he may also risk losing his friends for fame.

Gabe is forced to take final exams when it's revealed by Mr. Woodman that he wasn't really qualified to graduate when he did.

Arnold is accepted into a religious cult. Mr. Kotter and the three other sweathogs try to get Arnold to snap out of it. Eventually, he does and goes back to his former self, complete with his trademark laugh.

The sweathogs go bananas over Bambi, a pretty blonde girl from California. We get some very funny scenes of the guys in various costumes: Epstein as a guru, Freddy in a colorful shirt, Horshack as a movie producer, and Vinnie as a surfer. When Mr. Kotter gets fed-up with them disrupting the class, it's revealed that Bambi was just pretending to be from California in order to get attention.

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

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.

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

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

The Sweathogs, diverged from a food-fight, hold a sit-in to protest the school cafetieria's Wednesday liver.

Vinnie is saddened when his new coat is stolen.

Beau plays a number or pranks on Mr. Woodman.

Vinnie throws the Sweathogs out of his new apartment.

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.

A new girl joins the Sweathogs.

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

Arnold's relationship with Mary gets serious. Then he finds out he has to move and leave the school. Upset, Arnold decides to propose marriage to Mary. She accepts.

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.

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.

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.

When Julie goes away on a ski trip with a friend, stories from the Sweathogs and Mr. Woodman lead Gabe to be worried about the possibility of Julie cheating on him while she is away.

Juan, because of his love for animals, decides that he would like to be a veterinarian. A guidance couselor quickly thwarts his dream, until he performs an emergency operation on his pet hamster.

Gabe must choose between the comedy life, or his life at Buchanan.

Mr. Kripps, the shop teacher, has a heart attack and dies while yelling at Vinnie, who blames himself for the man's death.

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.

Vinnie becomes depressed when it seems that he has lost his way with women.

After Horshack refuses to disect a frog in class, his grade is in jeopardy.

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

To get up his nerve with Mary, Carvelli offers Arnold liquor. He doesn't like the idea at first, but as time goes on, he becomes addicted to drinking; developing a scary and unlikable new personality that only turns Mary away.

Freddie and Juan plan to do an act together for the upcoming talent contest, while Carvelli has some bribed judges up his sleeves. Arnold and Beau take over as judges, leaving Murray in the third spot.

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.

Kotter and the ""Sweathogs"" raise a telethon to raise $700 for new supplies. If not the remiedial class will be cut.

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.

Vinnie's goofing off in gym gets him in trouble with the teacher, Mr. Caruso, who's reprimending after class gets out of hand when he hits Vinnie in front of the girls' locker room.

After returning to his roots by taking over the Sweathogs' history class for a day, Mr. Woodman turns into a nice guy; and Kotter turns into the new Mr. Woodman.

When the opportunity to fight Carvelli in a boxing match arises, Arnold wants to be the one to do it; and when the other Sweathogs put down his manhood, he is even more determined to prove himself by getting in the ring.