"Arrividerci, Arnold" finds Horshack's grades so improved under Kotter's teaching that Woodman decides to promote him to a better class. Arnold is crushed to now find himself laughed at, with no jokes to make things easier. Kotter persuades the others to give Horshack the freedom to move on, but the little guy is led to believe that they've turned their backs on him. Realizing his mistake, Gabe dresses up as Arnold to put on a show for Mr. Woodman in order to convince him to restore Horshack to the Sweathogs. Kotter isn't as good doing Horshack as he is doing Groucho, but it's a treat to see him going toe to toe with the real Arnold.
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