X-Men: Days Of Future Past
It was the best of times, it was the worst of times: Relive the legendary first journey into the dystopian future of 2013 – where Sentinels stalk the Earth, and the X-Men are humanity’s only hope …until they die! Also featuring the first appearance of Alpha Flight, the return of the Wendigo, the history of the X-Men from Cyclops himself …and a demon for Christmas!?
Collecting Uncanny X-Men (1963) #138-143 and X-Men Annual #4.