History
Web of Wonders[]
When Spider-Man, and the Green Goblin were battling at the Oscorp building, the building ended up exploding. In result of the explosion, an army of Symbiotes that were being kept prisoner by Osborn ended up getting free. Those symbiotes started looking for human host, and Cletus was one of those humans. He became the host of Carnage, and became one of the leaders of an army of symbiotes alongside Eddie Brock, who was bonded with the Venom symbiote; wanting revenge on Osborn and world domination.
Due to their constant disagreements, and the influence of the students of the Avengers Academy on Eddie Brock, Venom defected from the army of symbiotes. Carnage decided to do things his own way, and kill everyone himself, but Spider-Man used a fire-based weapon to weaken and defeat him.
With Venom's help, Spider-Man was able to send the symbiotes back to their homeworld through a portal. Spider-Man gave that option to Carnage, but neither Carnage nor Cletus wanted to separate from each other, so they refused and ended up imprisoned in a cell at the Academy.