Valley boys take on the punk rockers in this teen-age adventure. This time they use skateboards instead of zip guns, knives and fists. The rich Valley kids, "The Ramp Locals," are led by Corey Webster, while the leather-clad, street-wise punks follow Tommy Hook. The trouble begins when Corey falls in love with Tommy's little sister who has come from Indiana for a visit. The rivalry between the gangs culminates during the grueling "LA Massacre," a 20-mile downhill skateboarding race. The winning team will earn a corporate sponsor. For the final race, the filmmakers strapped a camera in front of a skateboard to give viewers a sense of the thrills experienced by the daring "thrashers."