Chris Claremont and John Byrne's collaboration ranks among the greatest comics has ever known. But of their many iconic X-MEN stories, none was more epic or influential than the "Dark Phoenix Saga"! The X-Men have fought many battles, set out on galaxy-spanning adventures and grappled with enemies of limitless might, but nothing could prepare them for their most shocking fight: One of their own teammates, Jean Grey, has gained power beyond all comprehension, corrupting her into the Dark Phoenix!