The Brain and Brawn Brothers

The Brain and Brawn Brothers (天才と筋肉兄弟, Tensai to Kinniku Kyōdai) was a self-proclaimed team of the genius older brother, Fukegao and the muscular younger brother, Marugori. When Fukegao invented the Biceps Brachii King steroid drug, his brother ingested it and transformed into a mutated giant. Together, they allegedly combined the highest intelligence and highest physical power and strove to control the world. The brothers destroyed D-City, before Fukegao being killed by his own brother by mistake and Marugori, moments after, being defeated by Saitama, wrecking B-City in the process.