Thunderbolt.

The Fei Long Society, under the administration of chiefs Lung Lin, Pei Fen, Chen Ying-Chieh and Lung's sister Lung Chu, enjoys high prestige. One day a swordsman, Hung Wei, comes to join them. Hung later gets admitted after impressing the other chiefs with his fine fighting ability. The society's sub-branches soon come under the attack of the Black Tiger Gang. The chiefs of Fei Long Society head off to the branches in an attempt to save the situation. In their absence, the Society's stronghold falls to Hung's hands. Chen and Lung are attacked by Hung and his men. Lung swears to bring Chen back to justice...