Recently widowed mother, Shirley Partridge who's struggling to raise her five children who are playing in a band and, Shirley works a bank teller. Older brother and sister Keith (Lead vocals and guitar) and Laurie (Keyboards). Younger brothers and sister Danny (Bass guitar), Chris (Drums) and, Tracy (Tamborine and percussion) are playing in a band called "The Partridge Family". Ruben Kincaid, a kid hater was signed as their manager. Finally, the kids asked their mother to join the band. Reluctantly, she agreed but, for a single condition: if she faints the kids have ...
While parking their bus, Shirley bumps into a car. There is no damage, but when the driver finds they are famous, he fakes an injury for the insurance. Shirley and the family try to prove he is not injured by staying with him 24 hours.
Danny receives a letter from the Draft Board that he's been drafted into the United States Army. Shirley contacts he Draft Board and tries to convince them that Danny is 12, but they won't believe her; On top of that, they say the Draft Board doesn't make mistakes and he is to report. Now the family has to try once again to convince the Army that Danny is too young to serve and he reports as ordered.
With a hit record on the radio, Keith is starting to be followed and adored by the girls at his school. He is not too happy about it. However, the one girl he does like is not impressed that he is a recording star.
Danny gives stock advice to a very attractive cocktail waitress during the family's engagement in Las Vegas. However, the girl's very jealous boyfriend sends a couple of his goons to rough Danny because he thinks Danny is a much older man trying to steal his girl. A frightened Danny then runs away in terror thinking that he is about to be rubbed out by the mob.
While the family is on a picnic, a skunk sneaks on board the bus and winds up spraying them. They try the best they can to get rid of the odor without much success; even bathing in tomato juice. However, things go from bad to worse when Reuben informs them that they have been requested to play at a local hospital to entertain some of the children that are patients there.
After a song performance, Danny has an awkward moment when he is tangled with his microphone cord. The audience laughs at the moment, but Danny thinks they are laughing at him. He decides to add jokes to the Partridge Family performances.
When the Partridges are invited by to play a show at a prison, one of the inmates fakes an epidemic just to try to sell them some songs he claims to have written. However, a complication arises when an inmate who claims to be the true author confronts Shirley. She then comes up with a novel concept to try to prove who the real author is.
Keith's latest girlfriend is a member of a junior women's lib organization and he volunteers the group to play at one of their rallies without their knowledge. Unfortunately, they soon run afoul of a right wing conservative group that is bent on preventing the rally from taking place. However, Keith soon finds out that taking up a liberal cause is not all that its cracked up to be when his girlfriend threatens to break up with him if the family doesn't sing from a set list she has prepared rather than their first number-one hit, "I Think I Love You".
The family gets a good review from a famous columnist after one of their recent performances. However, she was seemingly impressed with Danny and declares him a future star. Unfortunately, Danny lets the review go to his head and is seriously contemplating leaving the band, even to the point where he holds auditions for his replacement. Now it is up to Shirley to convince her middle son that going solo is not such a hot idea.