Super Mankind Mutant (Part I)
"Super Mankind Mutant" (Part I) In this two part episode that wraps up the TV series, three evil little kid geniuses take on 8 Man with a variety of advanced inventions such as personal force fields, energy weapons and a rather ineffective robot who gets his can kicked by 8th Man several times. The first part basically introduces these things and also shows the European spy gang "Black Butterfly" at odds with both the evil kids and 8 Man. Dr Spectra also gets in the picture as an unexpected ally in this most unusual offing!
EP 55 - Super Mankind Mutant (Part I)

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.com)