Professor Kiu (
Roy Chiao) is a
mad scientist who developed mental disorders from grieving the death of his son. Kiu orders his assistants to kidnap men to his lab, located in a private container on a vessel, for experiments. Police inspector Uncle Wah (
Cho Tat-wah) had sent his subordinates to gather evidence in the vessel, but failed to find any. Shek La-mai (
Dean Shek), an
acrobatic performer working in a nightclub, has practiced martial arts since childhood and was a former commander of the
Special Duties Unit before he was dismissed by the police force due to accusations of sadism. Shek is currently a single father of three children living a happy life. One night during his performance, Shek and his protege, Lam Hong (Gary Lam), witnessed and intervened in a kidnapping incident by Kiu's henchmen, and the two became targets of Kiu. On the other hand, Uncle Wah discovers Shek's resemblance to a
Japanese scientist named Toyota, who colluded with Kiu. Wah formulates a plan for Shek to act undercover as Toyota in order to gather evidence from Kiu's lab. ==Cast==