History
Jean Grey's history presumably mirrors that of the Jean Grey of Earth-616 up to the point to where the Avengers confronted Michael Korvac. Supported by his wife Carina, Korvac was emboldened and killed the Avengers. Korvac then went on a rampage and began killing off cosmic beings that got in the way of his quest to bring order to the universe. Instead of killing off Jean Grey, who was the host of the Phoenix Force at the time, Korvac chose to banish her and the Phoenix from Earth-82432 along with Doctor Strange and the Silver Surfer as Korvac saw them as the greatest obstacles to his quest. Korvac eventually wiped out all life in the universe and himself with the Ultimate Nullifier.[1]
Jean Grey, the Phoenix, Doctor Strange, and the Silver Surfer later returned to Earth-82432 and attempted to resurrect Eternity, but Eternity's ghost dissuaded them from doing so he could act as an object lesson for the Multiverse. While Doctor Strange chose to remain in Earth-82432 to act as its Sorcerer Supreme, Jean Grey along with the Phoenix and the Silver Surfer left for part unknown.[2]