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.
Joe gets jealous when Stella goes on a date with VanDyke, so he calls for an emergency fashion meeting, ruining Stella's date. In turn, Stella gives Joe a bad outfit to wear when meeting the Queen of England.
Joe finds that it is rough being a member of JONAS when he develops a crush on a cello player who dislikes rock stars, so he decides to play the triangle in the orchestra. Nick and Kevin decide to help Joe by also joining the orchestra. Meanwhile, Macy and Stella have a bet on who can go longest minus their so called obsessions. Macy can't say JONAS and Stella can't text.
Nick experiences writer's block as part of a really bad day. When he falls asleep, he dreams of writing a great song but can't remember it once he wakes up, so Joe and Kevin try to re-create Nick's bad day to so that he will be able to dream his great song again.
Joe questions his relationship with Stella when invited to a fashion event. Meanwhile, Macy accepts a date with Randolph and decides to make him into a "Nick clone".
The members of JONAS try their hand at acting in a school production of the Three Musketeers. Joe then becomes jealous after finding out that Van Dyke Tosh, who fills in for Joe due to stage fright, is Stella's love interest.
A magazine linked Joe in a relationship with a celebrity named Fiona Skye (Sara Paxton). When Fiona begins to follow Joe, he and his brothers realize that something must be done.