Chen Zhen, a Chinese engineering student in Kyoto, who braves the insults and abuse of his Japanse fellow students for his local love Mitsuko Yamada, daughter of the director, returns in 1937 to his native Shangai, under Japanse protectorate -in fact military occupation- after reading about the death of his kung-fu master Hou Ting-An in a fight against the Japanese champion Ryuichi Akutagawa.
Hong Kong cop Chan Ka-Kui returns, working with Interpol to track down and arrest an illegal weapons dealer. Chan later realizes that things are not as simple as they appear and soon finds himself to be a pawn of an organization posing as Russian intelligence.
A virus gets loose in Taipei Army and SWAT teams oversee evacuation but in Ximending the gangs don't want the police They attack the military but when both find themselves under attack by zombies there is an alliance as they try and escape.