Jed Clampett's swamp is loaded with oil. When a wildcatter discovers the huge pool, Jed sells his land to the O.K. Oil Company and, at the urging of cousin Pearl, moves his family to a 35-room mansion in Beverly Hills, California. But when they get to their new home, which they think is a prison, and the gardeners are inmates, they are mistaken for vandals and get arrested. When Milburn Drysdale, president of the bank their money has been transferred to, finds out, he demands their release. Of course, he does not recognize Jed as a millionaire. He takes the family back to their house in the limo, but the Clampetts think they are being taken to prison. They run in the other direction and head for the hills.