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, Oldface and the muscular younger brother, Beefcake. When Oldface 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 strived to control the world. The brothers destroyed D-City, before Oldface being killed by his own brother by mistake and Beefcake, moments after, being defeated by Saitama, wrecking B-City in the process.