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 an `ordinary mortal', she is bent on breaking up the marriage.

Endora is disgusted when Samantha refuses to use supernatural powers to cope with the routine tasks of a suburban housewife. Faced with the problem of baking a cake, Samantha, in desperation, does resort to witchcraft, which also comes in handy when she inspects the house Darrin plans to buy for them. To convince Endora that the house can be liveable, Samantha transforms it in her own curious way.

Samantha gives a dinner party to impress Rex Baker, one of Darrin's clients. Rex brings along his date, Babs Livingston, but advances on Samantha in the garden when he gets drunk. Barker becomes too aggressive and Samantha changes him into a dog. Darrin, thinking only of the possible loss of the account, is furious and Samantha locks him and the dog out. Endora sets a cat on the dog, who comes out much the worse for wear.

Gladys Kravitz is unable to convince Abner that strange things seem to be happening; Darrin meets Samantha's mother for the first time.

Darrin struggles to create an advertising campaign for Caldwell Soup. Samantha's suggestions seem perfect, but Darrin suspects witchcraft. Phillip Caldwell rejects Darrin's own ideas. Samantha, worn out with housework, is stung when Darrin accuses her of using witchcraft to do that too. Endora, Samantha's mother, is pleased when the couple quarrel, and Samantha walks out.

Darrin discovers that Samantha has been entertaining a guest each morning after he leaves for work. The guest is 10-year-old Marshall Burns. Marshall's mother is a widow, whose over-protectiveness has robbed Marshall of all self-confidence. Darrin tells Samantha she has no right to interfere with Mrs Burns' upbringing of her son.