一对孪生兄弟王名成(刘青云)与王利就(周星驰)自小失散。名成与母相依为命，利就则为老粗鲁辉(梁家仁)收养，改名为鲁细。成是电影圈的新进导演，为人精明有绰头，敢作敢为；细则为通天经纪，性格爽朗具正义感。机缘巧合下两人相遇并共…

Around the time that the chief of police is elected the Most Popular Citizen of Valleby, a thief and impostor is released after two decades in jail and returns to the town with a revenge plan in mind.

The national struggle of two soldiers for the homeland.