In his latest ploy to further ingratiate himself to the Clampetts, Mr. Drysdale convinces them the annual running of the grunion fish is actually an invasion of a warlike people. The Clampetts promptly pack up for Malibu Beach to defend the coast.
Mr. Drysdale's latest ploy involving duping the Clampetts into believing the annual running of the grunion fish is an invasion of the people of Grun backfires when Miss Hathaway revolts and organizes the female bank employees in protest.
The final show of the series. Elly May's intended husband may win out in marrying her for the money. Hathaway tries expose his plan to Drysdale,Granny & Jed. Jethro may wed as well but may or may not return to California.