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The sweathogs out debate a smarter debate class.
Gabe insists that basketball ace Washington pass his social-studies test.
A flashback recalls Gabe's first meeting with his class. The Sweathogs Out Debate A Superior Class.
Tired of her reputation as easy, Rosalie Totsy tells the Sweathogs that she's pregnant -- and that one of them is the father -- in an effort to make the boys admit that the tales they tell about their ""fun dates"" with her aren't true.
Barbarino is running for Student Body President but his campain turns into disaster.
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.
With Vernajean's family moving, she and Freddie decide that they must get married in order to stay together. Their classmates act out married life to discourage the young couple.
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's teaching theories in question, he is temporarily suspended. The Sweathogs, liable to lose their teacher, come to his defense.
Gabe is less than thrilled when an old too-perfect classmate, and his too-perfect wife, decide to pay him a visit.
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.
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.
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.
The Sweathogs, diverged from a food-fight, hold a sit-in to protest the school cafetieria's Wednesday liver.
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.
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.
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.
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.
Kotter and the ""Sweathogs"" raise a telethon to raise $700 for new supplies. If not the remiedial class will be cut.
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'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.