With an absolutely massive cast that takes actors from both Bryan Singer‘s original trilogy and Matthew Vaughn‘s X-Men: First Class, this first poster from X-Men: Days of Future Past splices together the old and new Professor X and Magneto.

With both Patrick Stewart and James McAvoy playing Professor X and Ian McKellen and Michael Fassbender playing Magneto, Days of Future Past involves a time-traveling plot where mutants from the future travel back in time to help past X-Men characters stop malevolent machines, known as Sentinels, bent on destroying mutants once and for all.

Patrick Stewart/James McAvoy as Professor X

Ian McKellen/Michael Fassbender as Magneto

X-Men: Days of Future Past is directed by Bryan Singer and stars Patrick Stewart, James McAvoy, Ian McKellen, Michael Fassbender, Jennifer Lawrence, Halle Berry, Nicholas Hoult, Peter Dinklage, Ellen Page, Anna Paquin, Shaun Ashmore, Omar Sy and Evan Peters. It hits theaters on May 23, 2014.