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.

At Christmas time, the gang reminisces over past episodes.

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.

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.

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

Arnold is promoted to a regular class, but is less than happy about the forced transition.

Freddie, class treasurer, is accused of stealing funds, and an impromptue trial is held in the classroom.

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.

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.

Gabe is less than thrilled when an old too-perfect classmate, and his too-perfect wife, decide to pay him a visit.

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

After losing a fight with Todd Ludlow, Juan is made fun of by his fellow Sweathogs. His feelings and his pride hurt, he runs away -- to the Kotters' bathroom.

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.

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

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 insists that basketball ace Washington pass his social-studies test.

The sweathogs out debate a smarter debate class.

The sweathogs soon tire of Freddy as leader. Mr. Woodman even admits that he misses Barbarino. Julie and Vinnie turn up at the apartment, and Mr. Kotter has a heartfelt talk with them about the situation. Fortunately, all is forgiven, with Julie moving back home and Vinnie returning to class.

The class votes to make Freddie the new leader of the Sweathogs, taking Vinnie down a notch. Vinnie becomes so upset with the loss of his title that he quits school. When his parents become aware of this, they kick him out, and he ends up staying with the Kotters; much to the dismay of Julie, who is growing tired of the Sweathogs constantly occupying Gabe's attention and life, never leaving them any time alone together. Angry, she leaves to go to a hotel.

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.

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.

Gabe's teaching theories in question, he is temporarily suspended. The Sweathogs, liable to lose their teacher, come to his defense.

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.

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

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

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

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.

Vinnie is forced to deliver a baby in an elevator.

A new girl joins the Sweathogs.

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

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.

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.

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

Beau plays a number or pranks on Mr. Woodman.

For the school drama festival, Gabe is going to direct a scene from Cyrano de Bergerac. Arnold is set to play the lead, but recieves only heckling and ridicule from his fellow Sweathogs; and when Arnold turns up missing, Vinnie is forced to take his place on stage.

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.

Vinnie is saddened when his new coat is stolen.

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.

Vinnie throws the Sweathogs out of his new apartment.

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

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

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

The Sweathogs' new tutor is a computer. Despite initial raises in grades, Gabe becomes displeased with the machine, as it is turning him obsolete to the class.

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.

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.

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.

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

Emotions mix when it seems that the Sweathogs may win the lottery.

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

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

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

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.

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.