Born a mutant, Taro Raiden grew to abnormal size and became a Sumo wrestler until he was recruited by agents of Mento. Undergoing Promethium experiments voluntarily, he gained super-strength and denser-than-human skin. He was one of the two members of the Hybrid actually loyal to Mento's schemes. Behemoth, Gorgon, and Prometheus' pictures are on Roulette's wall of fallen heroes. Her club, The House pits drugged heroes against each other to the death.