A circus comes to Walnut Grove. Everybody is helping set up, except Nels Oleson. His long, lost sister is in the circus. Only Mrs. Oleson believes her husband's story about his sister. Nels is nominated to be the announcer at the circus. When he anno... (more)unces his sister, he says, "My sister, Annabelle." These words lead to Nels and Annabella becoming very close siblings.

Billy Barty, Bob Yerkes, Carl Carlson, Carol Buckley, D. White, Danny Rees, Dorothea Sabina Nock, Harriett Gibson, John Hayes, Ken Berry, Moore's Mongrels, Nate Stein, Paula Crist, Robert Wexler, Russ Saunders, Sandy Gross, Tara The Elepha, The Great John L., Wendy Schaal