Since the discovery that the Terrigen Mist - the key to unlocking an Inhuman's hidden potential and powers - is lethal to mutants, the X-Men and the Inhumans have been locked in a cold war. But as the Terrigen seeps into the earth and reaches an irreversable tipping point, the X-Men are spurred into action to ensure the future of their species. For Jean Gray, that means taking out the Inhumans' deadliest weapon: Karnak! But when Cyclops learns the truth behind his adult counterpart's quest to destroy the Inhumans, there'll be hell to pay! As the dust settles on the war, the original five X-Men will be reunited once more - but will they walk into their all-new future together or apart? Plus: Date night for Idie, and Dani Moonstar returns!