Elly wants a Gorilla, Jethro wants it to do all his chores. Jed asks Mr Drysdale if he can send one over. Mr Drysdale hires a man in a Gorilla suit & asks him if he can scare the Clampetts enough that they'll forget the Gorilla Idea. When He arrives things don't go as planned & Granny climbs into the cage to make the Gorilla behave. Elly names him ""Herby"" & Jethro puts him to work. After chopping wood & various other chores Granny wants Herby to do the ironing.

When Mr Drysdale arrives Herby (Mr Kelly) takes off the suit & leaves & Mr Drysdale puts it on & drives back to the bank.

The Clampetts then go to the Zoo & bring back a real Gorilla.

Mr Kelly (Herby) wants his money from Mr Drysdale. Mr Drysdale wants Herby to go back to the Clampetts to replace the real Gorilla. The Clampetts still think Herby's real & offer to buy him from Mr Kelly. Mr Drysdale arrives & has to wear the suit so Jed can meet Mr Kelly & offer him the money. When Mr Kelly gets the money he runs & Mr Drysdale chases after him.