WEST SIDE STORY on skateboards, THRASHIN' is a tale of rivalry between two gangs in which one gang leader's sister falls in love with the opposing gang leader. The gangs this time are "The Ramp Locals," some affluent Valley kids headed by clean-cut Corey Webster (Josh Brolin, son of
James), and "The Daggers," a gang of hardcore punk rockers in leather led by Tommy Hook (Robert Rusler). Hook's kid sister, the virginal, blonde Chrissy (Pamela Gidley), is visiting from Indiana and ends up falling for Corey, but Hook doesn't want his kid sister anywhere near someone from the
Valley. It all builds up to a final competition--the "LA Massacre," a dangerous 20-mile downhil...