Erik Lehnsherr is stuck re-living the same day over and over again - a day that just so happens to be the day he and Charles Xavier took a handful of mutants to Cuba to stop a war.

Six months after Cuba, Charles and Erik find themselves thrown fifty years into the future, where they meet their older selves, the Avengers, and a world that's very different from their own. Faced with the pieces of their broken relationship, an unparalleled adversary, and dealing with Tony Stark on a daily basis, Charles and Erik try to find a way back home - and to each other.