Uncanny X-Men: Days of Future Past, The

In a post-apocalyptic future the mutant-hunting killing machines known as the Sentinels rule America with an iron fist. Almost all mutants, super-heroes, and villains have been exterminated. Only a handful remain to fight against their oppressive robotic overseers. Now, Kate Pryde must travel back in time and warn the X-Men of the coming danger and maybe prevent this horrible future from ever taking place. It's Claremont and Byrne's final storyarc on the Merry Mutants and it's one of their best.