Samantha needs help painting her house, and Aunt Clara conjures up the most famous painter of all time, Leonardo da Vinci. Da Vinci is mad when he learns that his famous Mona Lisa painting will be used in Darrin's campaign to sell toothpaste. Samantha then gets him to create another best-selling idea.

Darrin's latest account is with the father of his old girlfriend Sheila who is up to her old tricks.