Many of his adventures involved Venom and Spider-Man, whom he believed to be his mortal enemies. During one such incident at the Raft, a mass breakout occurred, and Carnage was flown into orbit and ripped in half by the Sentry, seemingly being killed off. Years later, in an attempt to recover his symbiote, his body was captured, and he was found to be alive. Provided with cybernetic implants for legs, Cletus eventually recovered his symbiote as well and remains at large.The name "Carnage" may also refer to the Carnage Symbiote, the first of the seven spawns of the Venom Symbiote, which bonded to Cletus while he was serving eleven consecutive life sentences at Ryker's Island Prison.
Doctor Strange in The Multiverse o Madness - The Loop
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Cletus Kasady was a extremely mentally unstable serial killer who briefly shared a cell with Eddie Brock. When Eddie broke out of prison, a small portion of his symbiote was left behind, which attached itself with Cletus through a small wound on his hand — subsequently mutating in a new red-and-black symbiote, and Carnage was born. Using the abilities of his new symbiote, Cletus created a long history of slaughtering people and being put in jail for it.