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Biceps Brachii King

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Biceps Brachii King
Type Drug
Creator Fukegao
Owner(s) The Brain and Brawn Brothers
Manga Debut Chapter 3
Anime Debut Episode 1

Biceps Brachii King (上腕二頭キング, Jōwan Ni-tō Kingu) is an artificially created steroid drug, developed by Fukegao.


The Biceps Brachii King has a devastating effect, enhancing the user's muscles to the extent that their body mutates into a gigantic form of immense proportion. It was consumed by Marugori.[1]


  1. One-Punch Man Manga; Chapter 3, page 5

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