After narrowly escaping an encounter with a vicious gang of street punks called the Purple Dragons, Casey Jones vows to single-handedly rid his neighborhood of crime. Armed with a golf bag loaded with clubs and sporting a fearful hockey mask, Casey stalks the alleyways by night, mercilessly trouncing any delinquents unlucky enough to cross his path. The misguided crusader soon goes off the deep end, and an unlikely ally from the sewers is forced to intervene before the vigilante annihilates every criminal in the city.