Eightman (1963)

8 Man

A private investigator working a routine case involving stolen technology is mortally wounded. His only hope for survival comes from sacrificing his humanity to become 8Man—a powerful cyborg crime-fighter enhanced with a living human brain. Resurrected as the ultimate high-tech vigilante, it is up to 8Man to bring the lawless to justice and put an end to the escalating cycle of violence. A classic animated thriller that will leave you breathless. (Source: AnimeNfo)