Mark finally convinces Granny he's all human, then sets about resigning his Navy commission to pursue oceanography research. Mr. Drysdale creates a diversion to keep Jed from funding Mark's new ambitions.

Mr. Drysdale's latest ploy, involving duping the Clampetts into believing that the annual running of the grunion fish is an invasion by the people of Grun, backfires when Miss Hathaway organizes the female bank employees in protest.