A skiing vacation in the Alps accidentally leads the gang to the mountain fortress of Midas, a gold hoarder who has invented a gold-destroying blue microbe mist with which he is seeking to dissolve the world's supply of gold.
Capt. Mainwaring decides to harden the platoon's feet by long route marches. When the platoon has had enough the men find a clever way of stopping him.
Mike and Carol agree to allow Marcia to have a slumber party and the boys are thrilled because then they'll be able to play tricks on everyone. Then when Marcia gets into trouble at school, the slumber party is canceled.
Returning home from a visit to her father's ranch, Victoria and her escorts Sam and Pedro find infant Joey, the only survivor of an Indian raid on his parent's wagon. When the boy's grandfather, Dan Casement, spared only because he had gone ahead to scout for water, insists on leaving with the child, a concerned Victoria balks, insisting that she can better care of the baby en route to the safety of the Cannon ranch. Relenting, Casement joins them in their slow trek across the desert while Indians stalk them, awaiting the best time to attack.
In the very first day of their Salem vacation, Darrin and Samantha gets into serious trouble. While taking a tour of the House of the Seven Gables, a magic bedwarmer follows Samantha. The bedwarmer even follows them to their hotel room and the tour guide calls the police because she thinks that the Stephens stole the bedwarmer. Darrin gets taken to jail, leaving Samantha to get him out and to get to the bottom of this bed warmer mess.....
A judge decides to begin a series of lectures about a case that he tried eight years previously, the result of which was that a man was executed. Immediately he starts to receive death threats; but with no clues to help, the Chief may not be able to find the would-be murderer - who may, it appears, have committed the murder in the original case as well.
Oscar's date with a stewardess is interrupted by Felix's sickness.
A teenage boy fatally overdoses at a wild party. In order to find the drug supplier, Dan 'sweats out' the heroin-addicted host of the party in an attempt to gain information.
When an Alien Limpet UFO causes the destruction of Lunar Module 32, Straker demands a clean-up programme by the International Astrophysical Commission to remove hazardous space debris from Earth orbit. But Straker finds himself butting heads with I.A.C. chairman James Henderson, who wants a complete shut-down of SHADO operations...
Linc receives a desperate call from an old friend, now an inmate at a mental institution. Shortly afterward, the friend is dead of "heart failure", only the latest of a number of strange deaths at the place.
One Granny plus one Navy frogman equals a running gag: Granny thinks Elly's new beau is a frog.
Doc Adams feels that Sam McTavish (who is a woman Doctor) may replace him.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
Hogan convinces Klink that he is a great artist so he can smuggle out some maps in the Kommandant's canvases.
In the Middle East Willy and Barney infiltrate a chemical plant to gain access to Dehominant-B, a quick-acting lethal gas. Barney is exposed to Dehominant-A while trying to get to the computer and crippled - Willy escapes and Barney is captured. Barney is interrogated and only has four hours to live. The team find out that Dr. Jerry Carlin, a dropout, is the only other person with the skills to access the computer. When Carlin rejects the team's appeal for help, Jim and Paris frame Carlin's girlfriend and threaten to keep her in jail unless he helps them. Dana provides a distract and Paris takes the head scientist Vazan's place and have Barney first fake a confession implicating the technicians and then his own death - they get Barney to the autopsy room where Doug revives him in the nick of time. Jim and Carlin take the incriminated technicians' place and Carlin manages to ruin the Dehominant and erase the computer, then everyone escapes with Vazan.
When Phyllis's husband Lars takes ill, she asks Mary to babysit Bess for a few days. Bess decides she wants to stay permanently with Mary, to Phyllis's dismay.
While driving to the barnyard dance, the gang finds an injured bank guard. He gives them a blank paper and says something about a flame. The gang learns of a local bank robber called the Creeper. Things take a serious turn when the Creeper tries to steal the blank paper.