20th Century Fox has dropped the second trailer for the mutant saga X-Men: Days Of Future Past. Original X-Men director Bryan Singer helms the pic that mashes together both casts from its X-Men and X-Men: First Class franchises. Patrick Stewart, Ian McKellen, Hugh Jackman, Michael Fassbender, James McAvoy, Jennifer Lawrence, Halle Berry, Nicholas Hoult, and Ellen Page star. It’s set to bow on May 23.