Mou Tun-Fei

Japanese troops round up Chinese and Russian prisoners of war and take them to unit 731, where they're horribly tortured and experimented on to test new biological weapons.

In 1937, Japanese troops raid the Chinese city of Nanking to execute a planned massacre by subjecting over 300,000 helpless civilians to various tortures and atrocities before slaughtering them all.

A young kung fu student is thrown into jail on a false charge. He shares a cell with a shaggy convict, who is repeated tortured by the magistrate to reveal the deadly secret.