The series starts as Jed Clampett, a poor mountaineer, is living with his daughter and mother-in-law. While hunting for food, he discovers oil. The OK Oil company pays him a fortune for the right to drill on his land. Patriarch Jed's cousin Pearl Bodine tells him to move to California after being told his modest property could yield $25 million, and pressures him into taking her son Jethro along. The family moves into a mansion in wealthy Beverly Hills, California.

Double entendres and cultural misconceptions are the core of the sitcom's humor. Plots often involve unfamiliar situations. The Clampett's banker and neighbour is Mr. Drysdale who wants to keep the Clampetts in Beverly Hills and their money in his bank.

Daisy May Moses (Irene Ryan), called "Granny" by all (relatives or not) is Jed's shotgun-toting mother-in-law and a true daughter of Dixie. Paul Henning, the show's creator/producer, quickly disposed of the idea of Granny being Jed's mother, which would have changed the show's dynamics, making Granny the matriarch and Jed subordinate to her. Granny can be aggressive, but is often overruled by Jed. She is a Confederate to the core, defending President Jefferson Davis, the Stars and Bars, and the simple life. Short-fused and easily angered, Granny fancies herself a Baptist Christian with forgiveness in her heart. She abhors "revenuers" and blue-coat Yankees.

"Petticoat Junction" and "Green Acres" were spin-off shows of "The Beverly Hillbillies".

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