Tetsuo II: Body Hammer (1992) on Netflix

Plot summary

Taniguchi Tomoo works as a salaryman and lives with his wife, Kana, and their son, Minori. He holds no memories from before his adoption at the age of eight. On a trip out, two skinheads belonging to a gang of violent thugs fire an injection gun at him, filling him with an unknown substance, and kidnap Minori. Tomoo gives chase, and the two withdraw, leaving Minori unharmed. Rattled by the encounter, in which he believed his son was killed, Tomoo begins working out and finds himself capable of enormous feats of strength.