Phantom is the secret identity Western Bloc scientist Dr. Satonaka assumes when he begins to exact his revenge on the intelligence agents responsible for his beloved's death. He unfolds his plan in Episode 4 of the 009-1 anime.

Phantom claims he is a member of the Golden Bat spy group, but later his castle gets attacked by Golden Bat troopers for reasons that are not made perfectly clear to the audience. It is implied that Phantom may have been associated with Golden Bat at first, but has since fallen out with them, for unknown reasons.