Singer has said that , at the time he left , they had partially written a story for the movie which would have been only about Jean Grey 's resurrection . The story would also have a new villain Emma Frost , played by Sigourney Weaver . Though Singer , Harris and Dougherty did not produce a completed script , Singer revealed that at the time of his departure they had partially written a story treatment focusing on Jean Grey 's resurrection , which would also introduce the villain Emma Frost , a role intended for Sigourney Weaver .