His name is simply Bastion, and his goal is nothing less than the exterminitation of all mutantkind. His means: a new breed of Prime Sentinel, half-human, half-machine engines of destruction that subvert their own humanity in the name of protecting it. The only heroes who dare stand in his Way: The X-Men. Long hated and feared by the world they are sworn to protect, these mutant super heroes have never before been against such a wall, never before have they been hunted and cornered as they are now. A war of Zero Tolerance has been waged against their kind, and their very existence is at stake.