An old high school flame, Navy Captain Charles Corwin, comes to town to rekindle his past with Shirley. But Danny and Keith, who have mistaken the captain for a "ladies man", are out to torpedo the relationship before it leaves port.
Danny finds a brooch and gives it to Shirley on her birthday. When the brooch's original owner places a newspaper ad for its return, the kids devise a plan to purchase an identical brooch with the reward money, hoping that Shirley won't find out.
The Partridge family gets involved in energy conservation and publicly try to become a "model family" by saving electricity. Taking their efforts even one step further, Danny suggests that the paper should print the name of "energy hogs" for all to see. The only problem is that their own energy savings do not go well and they themselves are in danger of being branded as "energy hogs".moreless
Danny gets a crush on a jewish girl, and to impress her family he tells her father, Rabbi Stern, that the Partridge family is also Jewish. Things get out of hand when the entire family is invited over to the Stern's for supper.
Danny thinks that school is a waste of his time and talent, and Shirley reluctantly agrees to let him stay at home, knowing that it might be the best way for him to learn the true value of an education.
Reuben brings his latest musical talents, 14 year-old twin brothers, in to stay with the Partridges while the boys work on their first recording. But things start to go wrong when both of them get crushes on Laurie, threatening to destroy their singing careers before they even get started.
Shirley joins an art class, and the instructor goes overboard with praise about her paintings. But the Partridge kids know that it's not her awful paintings that he's in love with, and they have to come up with a plan to let their mom know the truth without hurting her feelings.moreless
After Danny gets into trouble sneaking into a movie theater, Shirley tries to teach him about being honest, and the whole family learns an important lesson: when it comes to some things, honesty isn't always the best policy.
Laurie meets a new boyfriend, a fellow who claims to be the heir to a large family fortune, when the Partridges play a gig on a cruise ship. But Keith and Danny suspect he is something else--an international jewel thief!
Convinced that Danny needs to spend more time with kids his own age, the older Partridges blackmail Danny into joining a Little League baseball team--and Danny's surprising success as a pitcher causes nothing but problems for everyone involved.
Keith's new girlfriend, a classical music student, convinces him that playing rock 'n' roll is a waste of his talent. Unfortunately, his first concerto written for the college orchestra, doesn't receive the type of critical acclaim that he had hoped for.
Noise pollution is the issue as the musical Partridges face professional ruin in the fourth-season opener. Seems the new next-door neighbor doesn't dig pop music and has installed a new kind of sound barrier-the law! This episode introduces regular Ricky Segall as the neighbors' four year old son. (1/2 hour)