Cletus Kassidy was serving multiple life sentences for murder when his cellmate, Eddie Brock, was freed by the Venom symbiote. The symbiote left behind its offspring that bonded with Cletus, creating Carnage, and he embarked on a city-wide killing spree. Spider-Man was eventually able to capture Carnage, with Venom’s aid, and he was incarcerated once more.
The symbiote grants its host enhanced strength and speed which are superior to those held by either Spider-Man or Venom, although it is not clear why this is the case. Like Spider-Man and Venom, Carnage possesses the power to stick to walls, and to generate “swing lines” or “tendrils” which he uses for travel in a fashion similar to webbing. Like Venom, Carnage generates “snares” to trap and entangle foes, and projects elongated claws. In addition, the Carnage symbiote also projects sharp bladed weapons such as axe blades, and sharp sword-like protrusions.
The symbiote is also capable of absorbing bullets from small-arms weapons firing conventional ammunition. However, the symbiote is vulnerable to both sonics and to heat-based attacks.