While in a small town for a performance, the Partridges and their manager attend the Sunday church service. Shirley and Reuben recognize the church singer as a formerly famous folk singer. They want to help him start his career again.
The Partridges are booked for a huge European tour. However, the booking agent in charge of the tour thinks that Shirley is too old and won't book them if she is part of the group. This then causes Shirley to doubt her continuing role in the band and contemplate retirement. However, the kids conspire to keep their mom from becoming a retired rock and roll star even to the point of intentionally giving a bad performance.
Laurie gets the bad news that she needs braces just as she thinks Jerry, the boy across the street, might finally get up the nerve to ask her to go steady. However, if that wasn't bad enough, Reuben informs the Partridges that they have been booked to appear on a high profile talk show. Things then go from bad to worse when Laurie's braces somehow pick up radio signals during rehearsals and causes her to play a different tune than what the band is. Who knew braces could be so complicated?
Shirley's former co-worker who talks about how wonderful Shirley's life must be now that she is famous. Shirley thinks they are still a normal family, so when on a tour Danny talks about the high life, Shirley thinks it is time for a break.
The Partridges and Ruben are in Detroit for a performance. Due to a booking mix-up, they arrive at the place where the Temptations are expected. The audiences are totally different. The Partridges agree to perform and hope for the best.
After arriving in town to play at a club, Laurie finds a former classmate works at the club. The entire club staff walks out in protest against management. Laurie takes a stand and refuses to perform so she can join the picket line.
Ruben meets a woman and it seems like love. They talk of marriage, but she wants Ruben to stop managing the band. Shirley tells him the Partridges can find another manager and to follow his heart. Then the Partridges realize they need Ruben
Keith has a new, albeit junk, car. He keeps putting money into restoring the car and make car payments. Out of money, Keith turns to Danny for help. Danny puts Keith on a tight budget so he can have money for the car and to go to the prom.
The Partridges and Ruben meet a girl at a diner who wants to hitch a ride when they drive off to Albuquerque. They take her along on the bus, and then the police catch up with them because the girl is a habitual run-away.
Lester is a new transfer to San Pueblo High and he already is beginning to develop a reputation as quite the ladies man. However, Keith panics when he hears that Laurie has accepted a date with the Lothario. After Danny plants the seed in his head that he might try something with Laurie, Keith goes after them with Danny in tow to make sure his sister's reputation remains intact, even though he promised Shirley he would butt out. Unfortunately, Keith's efforts meet with disastrous results as he winds up humiliating his sister. Now he must find a way to make it up to ...
The Partridges meet Bobby Conway, a composer who plays beautiful music and who is looking for a lyricist. They introduce him to Lionel Poindexter, whose poetry could provide excellent lyrics for Bobby's music. But Lionel's many eccentricities may drive Bobby away instead.
Stillman Kelly asks his old buddy Reuben to manage his daughter Dora, who is an aspiring singer. Unfortunately, when she auditions in front of Reuben and the Partridges, her vocal abilities leave much to be desired. Unfortunately, Keith, who has fallen for her, is so taken with her beauty that he doesn't even notice. However, when he hears a tape of her singing he soon snaps to his senses and now must try to summon the courage to tell Dora how untalented she is without hurting her feelings.
To raise money and create publicity, Ruben hosts a contest where the winner can spend a week with the Partridges at their home. The winner? Mrs Doris Nugast, a middle-aged woman wins the contest. Doris brings a new dimension to the family.
Keith gave an interview for a magazine and revealed that Laurie has a crush on a classmate, Harry Murphy. Laurie is upset and says it is the wrong name anyway. A motorcyclist, Harry Murphy, comes to visit Laurie to see who she is as a joke.
Shirley enrolls in college using her maiden name so her real name does not draw unwanted attention. A younger classmate develops a crush on her. He tells his parents and they do not approve of his dating an older woman.
The grocery guy who delivers to the Partridges has a crush on Laurie, but he feels shy around her. He wants to ask her out, but has never been on a date. The other family members help him change his appearance and get over his shyness.
Danny and the two other younger children tell Shirley they have decided to go in the hamster business. When the two hamsters multiple with their offspring, the Partridges have to take them on tour so they can feed and take care of them.
Shirley's father visits and announces he left home and plans to go to Big Spur. Minutes later, her mother shows up and says she ran away. Both parents are determined to split up. The Partridges find a way to bring them together again.
Danny sees his mother looking at a mink coat in a store window, and with Shirley's birthday coming up, Danny decides to buy it for her. To raise money, Danny starts selling Keith's personal belongings to the love-sick girls at school.
Reuben sets up an aggressive summer tour schedule. Shirley does not want to go on tour as it is tiring to drive all day and sing all night, so they hire a bus driver. But Danny is suspicious when they find out that he's an ex-con.
After performing in Vegas on Christmas Eve, the Partridges start the drive home. The bus breaks down in a town with one inhabitant. Disappointed about being away from home for Christmas, the prospector tells them a Christmas story.
Driving home after a tour, the Partridges stop for a picnic on a country road and meet a young woman who likes to travel alone and enjoy her freedom. After hours together, she stays at their home, leaves, and gives them a million dollars.