When Thanos devies a back up plan,he makes  ISAAC (the Eternals of Titan`s Computer ) create beings to destroy Titan .After Captain Mar-Vel was dropped into a Chaos, the Deity of Space created void he encountered Tartarus.God of the Abyss .Captain Mar-Vel defeated Tartarus using his photonic energy that Tartarus couldn`t absorb .Tartarus claimed that Chaos the Deity of Space was his brother .
