Archie is aghast to find out that his visiting niece plans to go out dancing with Lionel Jefferson.
A government scientist, Paul Morse, plans to sell a biological weapon, TOD-5, to terrorist Alpha Group led by Dr. Flory. The IMF must get to Morse's contact, Gordon Holt, and get him to take them to Alpha HQ. When Holt gets to the small town where he is to get the weapon from Morse, he finds the town under quarantine and people dying - then he starts showing (IMF-faked) symptoms of the disease. He grabs Mimi, who is supposedly immune, and takes her with him to Alpha HQ and infects them to force them to come up with an antidote - the IMF trail him and arrest the whole operation.
Josie and the gang encounter a race of giants allergic to the sun who steal their spaceship. The creatures have developed a fluid capable of extinguishing the Sun completely. Their leader and his henchmen plan to use the spaceship as a means of delivering the extinguisher.
The Chan's visit a circus and are present when Dimples, the fat lady, is stolen. Now it's up to Charlie Chan to solve the case while his children attempt to help in their own way.
A Vietnam veteran goes AWOL from the army in order to kidnap the son he has never seen.
When the gang find a lost dog, they return her to her owner, Phyllis Diller. They soon learn that Ms. Diller's house is haunted, presumably by the ghosts of her deceased husbands.But is it really ghosts. . .or someone trying to scare her into giving out the combination for her safe, which houses her priceless jewel collection?
Caine finds a young boy at a burned out cabin and tries to help him find his uncle. Along the way, bounty hunters find him.
The crew of Los Angeles County Fire Department Station 51, particularly the paramedic team, and Rampart Hospital respond to emergencies in their operating area.
Felix and Oscar join Brother Ralph, a former ad exec who turned his back on the rat race, at the Brotherhood of Life Mission for a retreat of peace and contemplation.
Snake, a motorcyclist friend of the Partridges, visits and wants help with the woman he loves. Snake proposed marriage, but he was turned down. Shirley and the family play cupid for Snake.
It's the beginning of another school year, and Marcia panics about becoming a freshman in school, going as far as pretending to be sick. However, after parents see through her act, they give her some advice, get involved and she does, joining every group or club available.
Vanity swoops through the platoon after Parliament decides that Home Guard members who are not fit for battle must be reassigned to the ARP and ARP wardens that are fit and able should be reassigned to the Home Guard. The platoon obviously doesn't want this to happen so resort to some rather shocking measures to fool the Area Commander into believing the men are suitable staying where they are.
Fred's toothache becomes an exercise in patience for Lamont when Fred refuses to see a dentist and instead tries Bubba's home remedy and a hypnotist. Finally, Fred decides to throw in the towel and visits a dentist but insists on a white dentist.
While in Rome the Protectors try to help a senator who is being blackmailed.
Mark's graduation from law school coincides with the arrest of a caretaker that he has befriended. Believing the man innocent, he finds the weight of the law stacked against him, and quickly becomes disillusioned with his new career. Should he turn his back on law altogether, though, or should he just find another way to devote himself to justice?
John Boy borrows an antique typewriter from the Baldwin sisters so he can send a story to a magazine. Mary Ellen mistakenly sells it to a junk man, but through diligence, gets it back for her brother.
The trio searches for Julie's cousin, a Vietnam veteran who missed his stop when he took the bus home.
A golden cross, on its way from a Mexican church to an American gangster anxious to reform his image, turns into worthless junk without ever leaving the possession of the couriers sent to deliver it. Banacek must figure out where and how the switch was pulled off.
In what was essentially the second part of a two-part episode centering on Griff King, the young parolee arrives at the Ponderosa and is hired as a ranch hand. Ben, Joe and the others exercise patience as they tries to help an arrogant, resentful Griff adjust to society and life an honest life.