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Carnage was the alias of the now deceased serial killer Cletus Kasady.
Cletus Kasady was a mentally unstable serial killer who briefly shared a jail cell with Eddie Brock, the original Venom. Eddie used his symbiote to make a quick escape, but, unbeknownst to him, it left behind its spawn. The new symbiote latched onto Cletus and created something far worse than either of the two individuals—Carnage.
Carnage was converted to a hero via a powerful psychic wave during the events of Axis. Before he could be reverted, he sacrificed himself to save Spider-Man.