Young Pugsley (Ken Weatherwax) copies one of his dad's old love letters and sends it to his teacher, Isobel Dunbar (guest star Jill Andre). Miss Dunbar comes to visit the Addams home and confesses to Gomez (John Astin) that no man has ever fallen so in love with her. Morticia (Carolyn Jones) volunteers to play the jealous wife to raise the teacher's morale.