Welcome to the high-intensity, high-octane world of Supercross, the extreme sport where gravity knows no limits. Brothers KC and Trip Carlyle are up-and-coming motorcycle racers with limited opportunities, unlimited potential, and dreams of becoming champions. When KC's big break comes in the form of a lucrative, corporate "factory" sponsorship, the brothers are torn apart, becoming bitter rivals both on and off the track. But when a tragic accident threatens their Supercross dreams, the brothers must cast aside their differences -- and fear itself -- to defy the odds and take the checkered flag!