Kasady is a sociopath and a homicidal sadist. He is a deeply disturbed individual with a dark past: he was born in psychiatric prison at Ravencroft, where his heart stopped for a few minutes until he was revived by Knull to be the one to free Knull from Klyntar. As a child, he killed his grandmother by pushing her down a flight of stairs, tried to murder his mother by dropping a hairdryer into her bathtub, and tortured and killed his mother's dog with a drill. After the latter, his mother then tried to kill Kasady and was apparently beaten to the brink of death by Kasady's father, who received no defense from Kasady during the trial. As an orphan, Kasady was sent to the St. Estes Home for Boys, where his antisocial behavior made him the target of abuse from both the other orphans and the staff.

Rebirth

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Kasady became a serial killer. He was then captured and sent to Ryker's Island prison for 11 murders — though he bragged about killing a dozen more — where he shared a cell with Eddie Brock, the host of the alien symbiote that turns into the supervillain Venom. When Brock's symbiote soon returned to be bonded again, allowing Venom to escape prison, the symbiote unknowingly left its offspring in the cell; due to its alien instincts, the symbiote felt no emotional attachment to its offspring, regarding it as insignificant, and thus never communicated its existence to Brock via their telepathic link. The new symbiote then bonded with Kasady, transforming him into Carnage. The bond between the Carnage symbiote and Kasady was stronger than the bond between Brock and the Venom symbiote. As a result, Carnage is far more violent, powerful, and deadly than Venom.He escaped prison, and began a series of murders, and at the scene of each crime, wrote "Carnage" on the walls with his own blood. He was found by Spider-Man, though the hero proved to be no match for Carnage's powers. In desperation, Spider-Man made a truce with Venom to fight Carnage. The Carnage symbiote was defeated and apparently destroyed with sonic weaponry, but unbeknownst to them the symbiote's deeper equilibrium with its host helped to save it. After entering Kasady's body through a small cut, it bonded to his blood (which caused its red coloration).

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