X-Men Vol. 1 (1963-1981) / The Uncanny X-Men Vol. 1 (1981-2011) #226

Argumento

The world has turned upside down. A rift has been torn in time and space and all time periods are converging at this point. Ancient civilizations, prehistoric creatures, and scientifically advanced races not yet seen are colliding with the present. Stuck right at the epicenter of it all is the X-Men. If the uncanny mutants can't find a way to defeat the mystical Adversary, the world, and reality for that matter is doomed. (mycomicshop.com)