New Fist of Fury

A brother and sister escape from Japanese-occupied Shanghai to stay with their grandfather in Taiwanese-occupied Taiwan, where he runs a Kung-Fu school. However, the master of another Japanese Kung-Fu school plans to dominate all schools on the island by murdering the grandfather, prompting Lung (Jackie Chan), initially a young thief shunning martial arts, to reestablish his grandfather's school and confront the karate master in a final fight.