Confusion takes over Hooterville as a bank robber and his girlfriend hold up in Pixley. The main problem is that the bank robber looks, and sounds exactly like Oliver Wendall Douglas! The first one to get confused is Eb, when he sees what looks like Oliver cheating on Lisa by kissing another girl. The look alike also causes confusions for Mr. Drucker and Mr. Kimbell when he makes a visit to Sam's store. On suspision, Oliver is arrested, while Mr. Drucker and Mr. Kimbell hold up the bank robber and send him to jail. Oliver and the robber are in jail, and the police can't tell who is the real Oliver, but they have Lisa come in to identify the real Mr. Douglas. She picks the robber, but Oliver comes up with an idea to reveal who is the real Oliver, when he has himself, and the robber write down where they believe Lisa has a mole.

The govenor announces ""Our state is bankrupt"" and that he is raising taxes 52%. Hooterville responds by blowing up the bridge over the swamp and forming their own kingdom, headed by King Oliver the I. King Oliver is wearing a crown because he ate the oleo margerine.

Lisa & Oliver decide to take a college course together in Pixley. Oliver chooses a farming course meeting on Mondays, Wednesdays & Fridays and Lisa decides on a Psychology course, simply because it meets on Tuesdays & Thursdays. After a few lessons, the zany members of Hooterville become enthralled with ""Doctor Lisa"", who helps solve Eb's, Mr. Kimball's and Arnold's problems with logical reasoning. Mr. Haney tries to sell Oliver a pyschiatrist's couch once used by Dr.Sigmund Frood. An exasperated Oliver has to make an appointment with ""the doctor"" when he intrudes on Mr. Drucker's psychiatric visit. Lisa gives up her practice to be Oliver's wife again.

Lisa cons Oliver into taking a 'fifth' honeymoon together, this time in Hawaii. When they check into the honeymoon suite, they are unaware that the hotel manager's daughter, has given her friends the suite for their honeymoon also. Since the suite has two bedrooms it's just a case of both couples avoiding each other while on their honeymoon(s), for a while anyway.