In the summer before their freshman year in high school, Julie (Alexa Vega) has a slumber party with her best friends, Hannah, Yancy, and Farrah - and they end up having the adventure of their lives. In attempt to cast off their less-than-cool reputations once and for all, Julie and her friends enter into an all-night scavenger hunt against their "popular girl" rivals. Hijacking dad's car, sneaking into clubs, evading Julie's mother, and even a first kiss - anything is possible at Julie's Sleepover.