Chen is a city boy who moves with his cousins to work at an ice factory. He does this with a family promise never to get involved in any fight. However, when members of his family begin disappearing after meeting the management of the factory, the resulting mystery and pressures force him to break that vow and take on the villainy of the Big Boss.
Tang Lung arrives in Rome to help his cousins in the restaurant business. They are being pressured to sell their property to the syndicate, who will stop at nothing to get what they want. When Tang arrives he poses a new threat to the syndicate, and they are unable to defeat him. The syndicate boss hires the best Japanese and European martial artists to fight Tang, but he easily finishes them off.