Armored Gorilla tells the story of Doctor Genus, the House of Evolution's founding leader who wants to study Saitama's power to replicate it. Saitama and Genos reach the House of Evolution's base, forcing Genus to release his strongest creation: the unstable Carnage Kabuto. After Kabuto effortlessly defeats Genos, Saitama is eager to fight him, but Kabuto cowers upon sensing Saitama's limitless power. Saitama finally explains the secret to his strength-a simple workout regimen, much to Genos and Genus's astonishment. This infuriates Kabuto as he transforms into his berserk form, only to be killed when he unwittingly makes Saitama realize that he missed out on a big supermarket sale. Saitama and Genos rush to the sale while Dr. Genus abandons his research.