Carnage Beetle is a villain from One Punch Man. The ultimate creation of the House of Evolution, Carnage Beetle is a large beetle-like humanoid and their strongest warrior. Despite this, Dr. Genus considers him a failure due to his instability and unwillingness to follow orders, and because of this he was kept locked away in their basement.
Dr. Genus decides to release Carnage Beetle once he learns all of his strongest warriors were defeated by Saitama and Genos, which his clones immediately freak out and disapprove. After Carnage Beetle kills some of the clones, Dr. Genus convinces him to fight Saitama. He attacks Genos and invites Saitama to their training room, which was a large empty room where they could fight with their full power. Genos tries to intervene and attacks Carnage Beetle, launching a powerful blast which Carnage Beetle blows back at him by just using his breath. He proceeds to attack Saitama, but stops at the last minute and files away from him, cowering in fear as he senses Saitama's immense power.
Saitama, seeing how everyone was surprised at his power, decides to tell everyone how he obtained his power. After he tells he got his powers from a regular training routine, Carnage Beetle feels insulted and decides to go all out on him, unleashing his Carnage Mode and transforming into a large purple form, which makes him go into a rampage for an entire week. Saitama receives all of his attacks but freaks out when he realizes it is Saturday already and he's missing a discount sale, punching Carnage Beetle and killing him instantly.