Chaos (Captain Mar-Vell)

Chaos was an artificial life-form created by Thanos and an enemy of Captain Mar-Vell.

History
Thanos initiated his "legacy" following his death (Marvel Two-In-One Annual #2), activating a preprogrammed system within ISAAC, the main computer of his homeworld, one of Saturn’s moons, Titan; this included dominating the Titan-spawned Elysius, imprisoning the native Eternals (at least the threatening members) behind a forcefield, and creating several beings in Life-Baths.

Drax the Destroyer sensed Thanos’ participation in this and attracted Captain Mar-Vell in the process.

One of the beings within the Life-Baths, Chaos, was released by ISAAC following the rebellion of Elysius and the freeing of the captured Titanian Eternals. While the liberated Eternals dealt with ISAAC’s robotic drones, Captain Mar-Vell, Drax, and Elysius faced Chaos. Chaos released its essence of reality around the renegades, and pulled Captain Mar-Vell into the dimension of Tartarus. Using the same life-giving solar energy that reinvigorated the newly freed Eternals against Tartarus, Captain Mar-Vell defeated the God of the Abyss. Shortly after, Elysius and Drax overcame Chaos by entering its destructive heart. Once Chaos was crushed, Mar-Vell returned to reality, in the bowels of Titan’s computer, ISAAC, damaging several image-related relays that gave the computer visual substance in the process.

Alongside Stellarax, Lord Gaea, and ISAAC-Prime (the robotic form of Titan’s computer still under Thanos’ influence), Chaos was resurrected with MORE power than before. They faced off against Captain Mar-Vell and Drax,. After a brief scuffle, ISSAC-Prime transported everybody into his control room which contained the Eternals, incapacitated from oxygen depravation. Chaos blasted Drax, stunning him. Mar-Vell responded by blasting Chaos with his photonic energy, making the construct inert.