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 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.

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.

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.

At Christmas time, the gang reminisces over past episodes.

The sweathogs out debate a smarter debate class.

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.

Vinnie is forced to deliver a baby in an elevator.

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.

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.

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

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

Horshack saves a lonely, overlooked girl named Mary Johnson from commiting suicide by jumping off the ledge of the school.

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

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.

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.

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 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.

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.

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.""

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.

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.

A new girl joins the Sweathogs.

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

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.

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

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.

Vinnie is saddened when his new coat is stolen.

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 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.

Julie gives birth to twin girls.

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

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.

Gabe finds success as a stand-up comic, using material regarding the Sweathogs. But when the oppportunity for a full-time comedy gig arises, it could mean the end of his teaching career.

Everybody helps Vinnie cram for a make-up test.

During a talent competition, Vinnie falls for a girl who the Sweathogs are competing against, and starts spending more time with her then rehearsing with the Sweathogs.

Beau plays a number or pranks on Mr. Woodman.

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.

The art teacher falls in love with Gabe.

Julie's parents come to see the babies.

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

Juan paints a great masterpiece on the walls of the school.

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

Vinnie throws the Sweathogs out of his new apartment.