S08E01: The Reincarnation of Nellie (1)

Percival and Nellie go to New York so that Percival can run the family business now that his father has died. Mrs. Oleson gets very depressed because of Nellie leaving. The Olesons decide to adopt a girl to take the place of Nellie. While they are in Sleepy Eye, they find a girl that looks almost exactly like Nellie when she was young.