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

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

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.

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.

Beau plays a number or pranks on Mr. Woodman.