Liu Ye reprises his role as Laosan, the former Navy officer who suffered brain damage while on duty. Low on mental capacity but stacked with Kung Fu skills Laosan would walk around the city fighting crime. And more crime is afoot when in The Underdog Knight 2 Laosan fights international criminals to protect a national treasure from being stolen during an exhibition. He also rescues his girlfriend from kidnappers. Director Ding Sheng returns to helm the film. Playing Laosan's girlfriend is Zhang Xinglin, Miss World 2007.