Mr. Drysdale is having a ground-breaking ceremony for a new bank building and the Clampetts think they need to pitch in to help build it. Meanwhile Mr. Drysdale's associates try to get stock market tips off of Jed.
The Clampetts get a big food package from home and Mr. Drysdale's two associates, Mr. Lucus and Mr. Pendleton, think that the crawdads have something to do with the development of military reconnaissance technology.
Mr. Drysdale wants Jed to incorporate for the tax advantages. So the Clampetts take over the top floor of the Commerce Bank and start doing what they can to stimulate the economy by getting more money into the hands of more people.
Mr. Drysdale get's Jed's old cabin from back home and sets it up in the Clampett's backyard to surprise Granny on her birthday. A coed with a sociology major thinks that they live there as the Drysdale's servants.
Mrs. Drysdale hires a demolition man to remove the Clampett's cabin. Mr. Drysdale decides to occupy the cabin so it can't be removed. The Clampetts think a "home wrecker" is breaking up the Drysdale's marriage.
Jethro's running late for his graduation ceremony despite his new watch. Mrs. Potts of Jethro's school is afraid that his attendance will jeopardize her chances for a new endowment. Cousin Bessie saves the day.
The Clampets are still at the studio hoping their city prospers. Mr. Drysdale is still trying to tear the studio down for his building project. A famous hollywood columnist enlists Jed's help to save the studio.
Mrs. Drysdale thinks she can get the hillbillies to move out by throwing herself at Jed. Meanwhile Granny is itching to fight her because she fell into the cement pond when Jed had to stop a fight between them earlier.
Jethro wants to be a double naught spy thinking it is a branch of the military. Jane gets him to consider something else. After a little prodding from Granny who has a score to settle with a whale he chooses the Marines and off they go.
Hospitalized for nerves from dealing with the hillbillies Mrs. Drysdale threatens Mr. Drysdale to stay there until he gets rid of them and even sending for a specialist. Unfortunately the Clampet clan is on their way to visit her.