Gomez (John Astin) plays host to Don Xavier Molines (guest star Anthony Caruso), a family friend during his childhood in Spain, and his daughter, Consuella (guest star Yardena). Morticia's (Carolyn Jones) hospitality changes to horror and shock when Consuella, believing Morticia to be Gomez's sister, reveals that she has been promised in marriage to Gomez since childhood and has come to marry him.