Tetsuo II: Body Hammer

A Japanese salaryman, Taniguchi Tomoo (Tomorowo Taguchi), transforms into a weapon through sheer rage after his son is kidnapped by a gang of violent thugs, led by Yatsu (Shinya Tsukamoto). As Taniguchi's body mutates, he becomes capable of enormous feats of strength and eventually kills his own son. The cult leader, Yatsu, manipulates Taniguchi's memories and pushes him to transform further, ultimately merging with his brother into a giant half-human, half-metal creature that wreaks havoc on the city.