Samantha and Darrin appear to be an ideally matched couple. Very much in love, they decide to marry. Darrin doesn't know that Samantha, is, of all things, a witch. On their wedding night, Samantha's mother, Endora, a witch, of course, visits her daughter. Regretting that her daughter has married a mortal, she is bent on breaking up the marriage. After pleading with her mother not to interfere, Samantha decides to tell her husband that he has unknowingly married a witch. To convince Darrin of her magic powers, Samantha performs a series of tricks. Darrin makes her promise never to practice her witchcraft again. Sheila, a former girl friend of Darrin's, invites the newlyweds to a dinner party. She makes every effort to embarrass Samantha before the guests. After enduring Sheila's snubs and insults, Samantha cannot resist evening the score. She employs her extraordinary powers to humiliate Sheila. Later, at home, Darrin rebukes his wife, but admits Sheila deserved the tricks played on her.