When Darrin's alcoholic and lecherous client Rex Barker makes a pass at Samantha, she decides to teach him a lesson by turning him into a dog. The dog runs away, but Samantha eventually gets him back. When Rex makes another pass at her, Darrin knocks him cold. Rex does wind up giving Darrin his account.

Samantha suggests clever slogans for Darrin's Caldwell Soup advertising campaign. Darrin is thrilled until he suspects Samantha of using magic to help. A fight ensues and Samantha goes home to mother. Darrin relents and pitches Sam's slogans to Caldwell. He doesn't like them either. Darrin now realises Sam didn't use any magic.

Larry sees Louise and Samantha entering an obstetrician's office and assumes Darrin is about to become a father. It is actually Louise who is pregnant, but she is afraid to tell Larry. After Larry tells Darrin, he has a daydream about Samantha having "witch" children. When the four of them have dinner that night, the truth comes out.