History
Hulk left to aid Olympus during the "Great Cataclysm" along with Thor, Thing and Hercules. Unlike the others, however, Hulk was found unconscious holding Hercules' mace, with his pigmentation turned white.
Some time afterward, he was assembled along with Wonder Man, Hawkeye, Mockingbird, and Tigra to fight off Ultron-19.
However, it turns out that the events of the "Great Cataclysm" altered his morals, and he switched sides, betraying the Avengers.
After the Hulk killed Tigra and broke Wonder Man's skin, Wonder Man decided to release all of his energy at once, killing both himself and Hulk and blinding Hawkeye.