Billie Jean Davy is a high school student living in Corpus Christi, Texas. One day, a group of local boys, including her brother Binx's friend, Billy, trash his scooter. When they refuse to pay for the damages, Billie Jean and her friends take matters into their own hands and confront the boys' father, Mike. During the confrontation, Mike sexually assaults Billie Jean, leading them to run away.
As they flee, Billie Jean becomes an unexpected symbol of rebellion and justice, with a growing following of teens inspired by her fight. They make their way across Texas, gaining more attention and support along the way, even appearing on national television. However, the situation becomes more dangerous as the authorities and the media turn against them.
Throughout the journey, Billie Jean develops a romantic relationship with Lloyd, a teenager who initially wanted to use her for his own personal gain but ultimately becomes a loyal ally. However, they are pursued by a police officer named Ringwald, who is determined to bring them to justice.
In the end, Billie Jean is cornered by Ringwald and his men, but the tables turn when Binx accidentally shoots Ringwald in the shoulder. Billie Jean decides to turn herself in, but instead of facing punishment, she becomes a hero to the youth of America and a symbol of fighting for what's right. The film ends with Billie Jean riding away on a horse, free from the constraints of societal norms, and her fight for justice becoming the stuff of legend.