A leprechaun from Darrin's family (surprise, surprise!) named Brian O'Brian comes to reclaim his rightful pot of gold from one of Darrin's clients Mr. John Dennis Robinson.Brian states that without his gold, he has no powers and gets into a lot of trouble trying to get his gold back. By the end of the episode, he makes a deal with Mr. Robinson: his pot of gold back for his image on the advertising campaign and a deal with McMann and Tate.