Like his Earth-616 counterpart, Kasady was an insane serial killer who bonded to the Carnage symbiote and became an enemy of Venom. When Venom's son Dylan Brock became the villain Codex and plotted to take over the world, Kasady volunteered to join the Sym-Soldier Program created to combat Codex. With help from Rex Strickland and the program's science officer Reed Richards, Kasady was able to suppress his bloodlust - becoming dour and taciturn. When Codex was successful in taking over the world, Kasady joined the resistance effort.
When the Resistance was alerted to an incident involving the Avengers, Agent Carnage joined the other members of the Sym-Soldiers - Agent Venom, Agent Spider-Man, Agent Deadpool, and Agent Mania - in investigating. Coming across the Venom of Earth-616 and his son Dylan, Cletus stoically introduced himself along with the other members of the team. Cletus was nearly attacked by Venom - who had longstanding enmity with his own world's Carnage - before Agent Venom intervened and vouched for him. When Codex's minions attacked, Agent Carnage and Venom fought the Juggernaut together before being forced to retreat.
Upon returning to the Resistance's base, Cletus was the only member of the team to not be outwardly surprised by the revelation that Eddie's son was his world's version of Dylan Brock.
Presently taciturn and stoic, Cletus is a man of few words when not suited up as Agent Carnage. While Cletus once had - as Agent Venom put it - "issues," he was able to learn to suppress his bloodlust as a result of military training under Tyrannosaurus and Agent Venom, and extensive "help" obtained from Mister Fantastic. When suited up, however, Cletus becomes more expressive and eager for combat.
Powers and Abilities
As Agent Carnage, Cletus favors transforming his arms into bladed weapons such as axes.