Kacey Simon is back to wearing contacts and she's finally adjusted to her braces -- no more lisp! -- but while she looks like her old self, she's trying her best not to slip into her former mean-girl queen-bee ways. That is, until Stevie moves to town. Stevie is Zander's ex-girlfriend and former lead singer from Seattle. She's got a great voice, awesome style, and she's climbing the social ladder faster than you can say "Simon Says." So not okay. With no more thought to the lessons she learned during her stay in Loserville, Kacey joins forces with her old friends to knock Stevie out of the spotlight, but it soon becomes apparent that there's an even bigger problem -- Stevie's dad is dating Kacey's mom! Both girls are horrified by the news, and, finally seeing eye-to-eye, they team up to sabotage their parents' relationship while fighting for their rightful places in the band and in the hierarchy of Marquette Middle School.