In a dark and dangerous 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 -and most of those are powerless, locked in mutant concentration camps. Now, Kate Pryde must travel back in time and warn the present-day X-Men of the coming danger - and hopefully prevent this horrible future from ever taking place!