Tetsuo II: Body Hammer

Tetsuo II Body Hammer is a 1992 Japanese science fictionhorror film directed by Shinya Tsukamoto. It is a biggerbudget reworking of the same directors 1989 movie Tetsuo The Iron Man, utilizing similar themes and ideas to the earlier film a Japanese salaryman, played by cult actor Tomorowo Taguchi, finds his body transforming into a weapon through sheer rage after his son is kidnapped by a gang of violent thugs. It was not as well received as its predecessor but it did win the Critics Award at the 3rd Yubari International Fantastic Film Festival in February 1992.

The film opens with a man being shot by Yatsu known as The Metal Fetishist or The Guy in this movie who fires the shot from his index finger, holding his hand like a gun.Taniguchi Tomoo is discussing his past with his wife, since he does not have any memories before his adoption at eight years old. He is almost killed when two cyborg skinheads try to kidnap his son, Minori. He is forced to take an injection by one of the skinheads. Frightened by the encounter, he starts working out. Unsuccessful lifting even the lightest of weights at first, he suddenly is capable of enormous feats of strength. Later, he gets an anonymous call asking how his training went. The caller informs Taniguchi that he has kidnapped Minori by entering through the buildings back door. Taniguchi chases the kidnappers to a roof where he again finds himself hanging on the edge, close to death. However, this time he manages to pull himself up, only to be told the skinhead already threw his son off the roof. ........

Source: Wikipedia