Fred Ziffel finds out that Arnold may in line for a inheritance. Arnold has the ability to predict the weather with his tail, supposedely making him a direct discendant of Herman, a spokespig who could also do the same. All of Hooterville, including Lisa tries to get Oliver to take Arnold to Chicago to receive the pig's $20,000,000 inheritance.

When the Douglases, Eb, and Arnold return from Chicago, Arnold becomes a gift-bearing pig. He gives Mr. Kimball a wristwatch, Lisa an expensive braclet, and Oliver a shrunken head. Arnold soon finds himself the target of every seller from Hooterville, Pixley, and Crabwell Corners, who want their hands on Arnold's inheritance.