The Cannon family runs the High Chaparral Ranch in the Arizona Territory in 1870s.
99 moonlights as the secretary of a radio personality to discover a secret KAOS code.
Hogan throws an anniversary party for Klink, planning to use party balloons to forecast the weather.
Samantha and Darrin have a flashback. Darrin has to go to Japan to do business with a client, but cannot leave Samantha's side when her baby is due. Endora breaks Darrin into two people: the fun Darrin and the business Darrin, with strange and hilarious results.
Bronson is charmed by Sibyl who fancies herself a witch and is part of a band of occultists lead by cult-leader Hermes. Bronson at first is entertained by her beliefs but later recoils at her lifestyle. Ultimately, Sibyl has to determine the greater meaning of the supernatural, and in the process--life.
Jethro arrives in Hooterville wearing the uniform of a general.
McGarrett gets a surprise birthday party, but when he goes to pack the presents in his car, it explodes and blinds him. Danno, Chin Ho and Kono must work to catch those responsible, whilst McGarrett has to get used to not having his eyesight.
Young Sister Bertrille uses her ability to become airborne to help others, whether they want it or not. Although her aims are always benevolent, her means are often bemoaned by Mother Superior. The other Sisters must cope with their beloved Sister's aerodynamics and antics as she flies in and out of trouble.
New housewife Jeannie goes overboard when Tony puts her on a budget.
Pete befriends Joey Kovacs, a youth whose father escaped from a mental institution and has vowed to kill a man who cheated him years before. Kovacs: Nehemiah Persoff. Doris: Marj Dusay. Pete: Michael Cole. Sanders: Ross Elliott. Franklin: Peter Brown. Linc: Clarence Williams III.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
The Royal Philharmonic Orchestra goes to the bathroom, a footballer is interviewed and Batley Townswomen's Guild re-enact the invasion of Pearl Harbour.
Jim Phelps poses as an amnesia victim in order to retrieve a stolen isotope, one that could make nuclear weapons affordable to any country.
The Earthlings become involved with a superstitious Irish Giant who believes they're leprechauns.
Directors of the Capitol Land and Development Company are being killed. They have the tender for the Cupid project, an underground government headquarters in the event of a nuclear war. Clues such as a red nose and a giant footprint lead the Avengers to a home for retired clowns, irate that the project will flatten a sainted variety theatre and with an agenda of their own.
The Cannon family runs the High Chaparral Ranch in the Arizona Territory in 1870s.
Hogan prods Sergeant Schultz to reveal the site of a secret atomic installation that Schultz has been assigned to guard.
Peter comes home from school with the measles, so naturally, Carol calls the doctor, her doctor, who happens to be a woman. Meanwhile, Mike calls his doctor, a man. Soon all the kids come down with the measles and the household is in an uproar in yet another battle of the sexes, as the girls want a female doctor and the boys want a male doctor.