Mike's emergency appendectomy precipitates an argument between Archie and Gloria regarding the proficiency of women doctors.
To rejuvenate the tourism that's dropped off since the rumors of ghosts have circulated, the gang helps former-Monkee Davy Jones prove that the Horseman of his Hagglethorn Hall is a phony.
Crime boss Metzger determines that the IMF was responsible for the heist at the Aquarius Casino (from last season's episode ""Casino"") and kidnaps Jim when he and Barney are on vacation, forcing the IMF to work for him to recover evidence against him from a safe deposit box. The evidence, a letter, is being used as a bargaining chip by Metzger's former crony, Connally, to get Federal immunity for his testimony. Casey and Willy manage to steal both keys to the box and get the letter, except Metzger's subordinate Hawks steals the letter to blackmail his boss. Barney comes up with a fake letter and use it to get to Jim where the IMF takes everyone into custody.
Aliens that reside on a ship that resembles a planet plan to enslave others by using a ray that turns its victims into children.
A mural has been stolen. While on the case, Stanley accidentally makes Henry swallow a clock.
The murders of a flight attendant and a nurse who were rooming together lead Stone and Keller to suspect a jewelry salesman and his wife.
Bob decides that for his own mental well-being, he needs some peace and quiet. He moves into a hotel room by himself, leaving a confused Howard Borden thinking that Bob and Emily have split up.
When Jones arrives at the bank to deposit £500 from local shopkeepers for the servicemen's canteen, he realises his packet contains half a pound of sausages instead of the money.
After meeting Allen Ludden and Betty White at a restaurant where our buddies were having dinner with their dates, Oscar and Felix practice Password at home with their friends, and then try out for the show, where they become contestants, and the hilarity ensues!
Fred's old girlfriend Juanita stops by for dinner with her daughter, Alice. Lamont falls for Alice and thinks of asking for her hand in marriage. However, Juanita tells Fred that Alice is his daughter and Lamont is wining and dining his sister.
The brothers of both Richard and Hudson are visiting, causing both men to do things they otherwise would not. For Hudson, it means putting on airs, and for Richard, the visit causes him to snoop, an action he considers beneath him.
A series of cleverly orchestrated crimes in a section of San Francisco leads the Chief to the conclusion that a pair of bored society beaux have turned the city into a giant chessboard, and are playing a game with the citizens as their chess pieces.
Features gags and sketches such as Biggles Dictates a Letter, Climbing the North Face of the Uxbridge Road, Lifeboat and The Cheese Shop.
John-Boy's truck breaks down and he meets the author, A.J. Covington. John-Boy jeopardizes a timber contract badly needed by the family.
A Korean girl finds trouble in her search for her American father. Pete accidentally hits her with his car after she runs from the scene of a murder she witnessed, and the killers are still after her.
Maude pulls out all her high school memorabilia as she awaits the arrival of an old school friend, Phyllis Nash, who was nicknamed both ""Bunny"" because of an overbite and ""Mousie"" because of her looks. However, Maude is stunned and becomes envious when she discovers Phyllis is now a beauty with a career to match.
Dr. Will Agar is Virginia City's new town doctor, and brings with him new skills and expertise to treat area residents' health maladies. Only thing is, Dr. Agar is seriously addicted to morphine, and it results in serious trouble for everyone.