Collects Uncanny X-Men (1981) #225-227, New Mutants (1983) #59-61 And X-Factor (1986) #24-26. The biggest and best adventures of Marvel's mighty mutants — these are the X-Men Milestones! Three teams of mutants. Three tales of tragedy. The event that changed the X-Men's lives forever! Witness the transformation of the carefree, highflying Angel into the dark and brooding iron-winged Archangel as Apocalypse's shadow falls over X-Factor. Relive the tragedy of the New Mutants as their innocence is lost along with the life of a teammate. And watch as the legendary X-Men make the ultimate sacrifice, charging headlong into death itself to protect a world that hates and fears them! This classic tale brought changes so significant and losses so bitter that the aftermath is still felt in the pages of X-Men titles today.