The mutant masterpiece Days of Future Past warned of a dark future in store for the X-Men if they failed in their mission. Now, writer Marc Guggenheim and artist Manuel Garcia reveal the untold tale fo how this dystopia came to be. Witness 30 years of tragic events that led to a world where mutants are hated and feared like never before - one that seems destined to end in mutantkind's ultimate doom! Also includes the original Days of Future Past story by Chris Claremont and John Byrne. Reprinting X-Men: Days of Future Past - Doomsday (2023) #1-4 and Uncanny X-Men #141-142.