The Brain and Brawn Brothers

The team amounted to two brothers of sharply contrasting builds. Fukegao was an unremarkable human in every respect, presenting himself in a lab coat as the intellect of the pair. Marugori, by contrast, had taken on a monstrous form that swelled him to enormous size, supplying the raw physical force. Between them they claimed to combine peerless genius with unmatched strength.

The pair's rampage began after Fukegao developed a steroid called Biceps Brachii King. Once his brother swallowed it, Marugori mutated into a towering giant, and the two set out to seize control of the world by fusing the sharpest mind with the greatest muscle. Their assault leveled much of D-City. Before long, Saitama turned up perched on Marugori's shoulder, and Fukegao ordered the giant to crush him. Marugori swung at the wrong shoulder, accidentally killing his own brother in the process. Saitama then knocked Marugori down, and the giant's fall inflicted heavy damage on B-City as well.

Fukegao served as the group's leader and mastermind, operating out of his laboratory in D-City, while Marugori provided the muscle after his transformation. Both brothers died during their single rampage, leaving the team defunct.