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With Barbarino now an orderly at a hospital, the Sweathogs try to get jobs there, too. Meanwhile, Kotter tries to get the gang to return to school.
The Sweathogs remember how they tried to buy a used car from Vinnie's uncle.
Horshack saves a lonely, overlooked girl named Mary Johnson from committing suicide by jumping off the ledge of the school.
When Mr. Woodman comes to Vinnie's hospital for an operation, Vinnie loses him and he and the other Sweathogs try to find him.
After Horshack refuses to dissect a frog in class, his grade is in jeopardy.
Beau, a new student in the remedial class, seems to be taking all the attention away from the Sweathogs.
Vinnie gets a new apartment, but when the Sweathogs decide to use it, Vinnie asks them to leave.
Vinnie becomes depressed when it seems that he has lost his way with women.
The Sweathogs opt to change Mr. Woodman's tired old school song. A hot music artist wants to record it but Woodman refuses until he sees how much money he could make. However, the song turns out to be not original.
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.
A younger student begins to imitate Freddie, not much to Freddie's liking.
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.
A practical joke backfires when the new Sweathog, Beauregard De Labarre sets Epstein up for a date with a "married woman."