Bewitched (1964)

S2E27 The Leprechaun

Darrin discovers that he has a leprechaun in his family named Brian O'Brian, who arrives to retrieve his stolen pot of gold from one of Darrin's clients, Mr. John Dennis Robinson. Brian reveals that he loses his magical powers without his gold, leading to a series of chaotic attempts to reclaim it. Ultimately, Brian strikes a deal with Mr. Robinson: in exchange for his pot of gold, he will allow his likeness to be featured in an advertising campaign, along with a partnership with McMann and Tate.