Worldbreaker Hulk is the incarnation of Bruce Banner’s Hulk that emerges in response to an overwhelming situation that threatens the green world.
He appeared as a result of Banner bargaining with the Dweller-in-Darkness for protection from the Great Ones using people from an alternate reality. As part of this bargain, he was forced to fight their champion, with his life dependent on victory. The Dweller removed Bruce Banner’s intellect and emotions, so all he had left was violence and rage, symbolizing what is said about man at his worst in Rudyard Kipling’s poem “Invictus”.