S8E2 — The Reincarnation of Nellie (2)

Nancy turns out to be worse than Nellie ever was. She even locks another girl in the ice house. The students devise a plan to teach Nancy a lesson. They trick her into being the star in a dunking tank. Also during this episode, Adam and Mary move to New York so that they can earn a living and Hester Sue comes to Walnut Grove to work at the restaurant.