Brothers Kevin, Joe and Nick Lucas are global rock stars — the band JONAS! When the trio aren't on tour, the guys live in New Jersey on Jonas Street (the inspiration for the band's name) with their parents, Tom and Sandy, and little brother Frankie. They attend Horace Mantis Academy with their childhood friend Stella Malone, who offers the boys endless style tips, and her best friend, star athlete Macy Misa.
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Kevin and Joe warn Nick that he's falling too fast for his crush, Penny, but Nick doesn't listen to them. Nick then becomes heartbroken when he hears Penny singing a love song he wrote specially for her to her boyfriend. Meanwhile, Stella creates a new line of clothing called Stellcro and uses Macy to test it.
The boys try to reenact their Mom's home movies, after ruining the original copies.
When Joe, Nick and Kevin all fall for Maria, the pizza girl, they compete with each other to impress her.
The guys find simple chores hard to do when excited fans constantly mob them.
Joe's childhood friend Carl comes to visit them, but manipulates their popularity for his own gain so they teach him a lesson. Meanwhile, Stella is furious with Macy for using the money she lent her to buy a collector potato chip that has a resemblance to Joe.
When Kevin lets Macy be a backup singer on the next JONAS album, her voice turns out to be terrible, putting Kevin in an awkward situation.