When Mr. and Mrs. Goldstein find they have an uninvited guest, they don't know if they should make him welcome or make him leave. Mr. Goldstein is all for telling him to stay, pointing out to his wife that not everybody has a Leprechaun for a houseguest; and Joseph, their unruly eight-year-old son, meets his match when the Leprechaun uses magic to teach him a lesson.