Not much is known about the past of the costumed hero named Sumo, how he came to become a member of the super-group called Xen remains unrevealed. The origins of Sumo's powers are unknown, but it's presumable that he gained his powers from exposure to the Terrigen Mist that were released in the air by Black Bolt. He would aid Xen in defending the Asian continent from any threats.
He and his fellow Xen members would try and stop the Tong of Creel from stealing the hands of the Absorbing Man, which were entrusted to his fellow Xen teammate Tao. Xen failed in stopping the Tong from stealing the hands. Later Sumo would join her fellow teammates in aiding Dr. Strange in saving Clea from Asgard. The heroes would succeed in saving Clea, however they would find that during their absence, Japan was attacked by the reanimated corpse of Fin Fang Foom. With the help of Strange and Clea, Xen destroyed Fin Fang Foom. Sumo's current activities are presently unknown.


Sumo has metallic skin of an unknown composition, it makes him more durable and resistant to harm, however the exact durability are unknown. He also has super-human strength, the exact limits are unknown, however he was able to fight Voltstagg to a standstill.

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