Stated as the best assassin of the Boma Tribes, Gunman Boma is brought in to defeat the Turboranger, easily defeating Blue Turbo in an initial gun showdown. However he ends up in the middle of a situation involving two "Blue Turbos" when Ken'ichi Yamada, a nerdy Musashino student, steals Yohei's Turbo Brace to become Blue Turbo himself. While he is easily able to defeat the Turboranger while they were in crisis with the "second" Blue Turbo, Ken'ichi ultimately becomes the means to his downfall when he later creates a bomb disguised as one of his bullets that he switched in his holster to blow up in his face when fired. With his Turbo Brace restored, Youhei takes Gunman Boma down with his J Gun before the team finishes him off with the V-Turbo Bazooka.