Collects Uncanny X-Men (1981) #294-297, X-Factor (1986) #84-86, X-Men (1991) #14-16, X-Force (1991) #16-18, Stryfe's Strike File #1. The biggest and best adventures of Marvel's mighty mutants - these are the X-Men Milestones! And this is the story so big it took four titles to contain it! When Cyclops and Phoenix are kidnapped - and Cable seemingly assassinates Professor X - the X-Men, X-Factor and X-Force go to war...with each other! Witness epic battles around the globe and on the moon as Mr. Sinister's subtle plan of vengeance on Apocalypse unfolds and major revelations are made about the true identities of Cable and his twisted doppelgänger, Stryfe! Featuring blood, angst, sacrifice and great big guns as Marvel's mutant families dance to the villains' twisted tune!