Wednesday is assigned a school project on an influential relative. She asks Grandmama to summon Great-Aunt Esther in a seance. Always one letter off, Grandmama accidentally summons up the ghost of her brother Jester, who was a habitual practical joker. He pulls his pranks on everyone, even sabotaging Gomez' Trainwreck. His antics soon wear thin, but the family has trouble evicting him.