Skull

スカール

Skull is the tyrannical leader of the evil Black Ghost Organization, whose primary mission is to instigate war between two global powers by dealing weapons. His true identity remains unknown because he wears a helmet resembling a skull and an all-black suit that appears to feature rib-like structures, followed by a red cape. According to some sources, his given name is Skull.
Skull was nearly killed when the 00 cyborgs infiltrated Black Ghost's Base (which they believed to be the Black Ghost HQ until later in the manga and anime) and planted explosives, leaving 009 and Black Ghost to fight one-on-one. It is revealed that Black Ghost is not only a cyborg but a highly advanced one, soundly defeating 009 using his superior acceleration mode. Only a last-ditch effort managed to save the nine cyborgs (009 held on to Black Ghost while plummeting into what looked like a vat of liquid nitrate, and then 001 teleported 009 to safety).
It is not known how Black Ghost survived the explosion. In addition to Black Ghost apparently being a cyborg himself, the true leaders of the Black Ghost Organization turn out to be three brains. Although the three brains were destroyed in the end, they claim to be only a part of the entire Black Ghost organization and that the Black Ghost organization was universal, with them serving merely as the leaders of the Earth branch.