Mary reluctantly finds herself romantically involved with a married man.
Shirley has doubts about what being on the road is doing to the Partridges' lives so she suggests they take a break and start living like a normal family again. But she forgets one thing: they're not a normal family. Guest Star: Richard Mulligan as Dr. Jim Lucas Songs: "I'm Here, You're Here"; "I Can Feel Your Heartbeat"
Tired of being the middle blond girl of the family, Jan tries to alter her appearance by buying a black wig, which she intends to wear to a friend's upcoming birthday party.
Endora presents an idea for a great campaign for the Bobbins Bon Bons account, and Bobbins takes a liking to her. He insists that she promote her idea on a TV show, which she refuses due to a ski date. So Samantha poses as Endora, but the deception is short-lived when the real Endora appears, magically, on live TV. Because of the special effects, Bobbins is sold on the idea.
Five-O investigates the death of Vietnam hero Jack Rigney, who fell from a balcony. His father is a World War II veteran, but his brother Michael is a peacenik, and Danno goes undercover as a draft dodger to help solve the mystery of Jack's death.
After a UFO inexplicably destroys itself less than two miles from Moonbase, a mysterious crystal rock is recovered, and it causes the person in its vicinity to hallucinate. The man on Moonbase who found it thinks Mexican bandits have taken over Moonbase. It gets transferred to Straker's office, and he hallucinates that SHADO is simply a set for a TV series, he is an actor named Mr. Burns, Moonbase can be reached by stepping through two doors from the main control room at SHADO HQ, and "Mr. Straker" is not available. Straker breaks the hallucination by jumping in on the scene while the "character" Gen. Henderson is doing a close-up of the line they were doing when the hallucination began.
Lucy Carter, a widow with two teen children, takes a job as a secretary for her stuffy brother-in-law.
Jack Cassidy as the mastermind of an unusual business: his clients pay him to harass people and he employs a gang of youths to do the dirty work. Pete: Michael Cole. Mrs. Hamilton: Barbara Rush. Linc: Clarence Williams III. Johnny: Richard Kim Milford. Julie: Peggy Lipton.
A task force of Clampetts awaits an invasion of the U.S. by fish.
It's Edith and Archie Bunker's wedding anniversary. Edith manages to drag Archie to church. Daughter Gloria and her husband Mike try to whip up a party atmosphere for the parents.
An insecure Jamie is unsure of his place in the family, having trouble adjusting at his new school and keeps getting harassed by a bully. When he takes Ben's prized gold-plated rifle and breaks it, he runs away, sending Ben to go looking for him.
Klink takes Hogan to England to steal an Allied plane, but Hogan has other plans --- to expose some Nazi spies.
Attempting to find out where Jo encountered the Master, the Doctor heads to the circus where he falls foul of Rossini.
Mary gets a tempting offer from a rival television station, but becomes reluctant to leave when her WJM-TV colleagues throw a farewell party for her.
Jan and Cindy catch Greg smoking with some friends. This leads to them telling Marcia who in turn tells Mike and Carol.
Laurie gets braces right before a television show comes to film the band. As if that isn't bad enough, when they begin to play, her braces pick up radio signals and all she can hear is The Rolling Stones! Guest Star: Mark Hamill as Jerry Song: "The Love Song"