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.
A teacher lets Joe slide on an accident with a fire alarm, but gives his friend Abby detention for the same mistake. Joe then attempts to get detention which he succeeds, and tries to apologize to Abby with Nick and Kevin's help. Meanwhile, Stella struggles with her grade in P.E. class, and tries to make sewing a sport.
Stella becomes jealous of Macy spending time with Joe not knowing they're actually planning a surprise party for her.
Kevin, Joe and Nick are left home alone for a week and they try to behave and impress their parents, but when Frankie throws a party, their plans go into a tailspin. Meanwhile, Stella unwittingly "takes control" of the JONAS fan club from Macy.
When Joe, Nick, and Kevin forget Stella's birthday, they try to plan her another one but schedule it at the same time as a "big interview".
When Kevin thinks there is a ghost in the firehouse, he enlists Stella, Joe and Nick to help him find it. They do not think there is a ghost until Nick disappears.
Van Dyke asks Stella on a date to El Meat, a new, all-meat restaurant, and a jealous Joe crashes the date with Macy, in order to keep an eye on Stella. Kevin has an addiction to Nick's cookies and Nick tries to teach Kevin about self-control.