As promised, Fox this morning debuted the second full-length trailer for director Bryan Singer's "X-Men: Day of Future Past," one that succinctly lays out the sequel's key conflicts: in the future, mutants on the brink of extinction; in the past, the schism between a Xavier and Magneto.

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But more than that, it casts a spotlight (if sometimes only briefly) on characters both old and new -- yes, Halle Berry is in the film -- and shows the mutant-hunting Sentinels in action.

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Opening May 23, "X-Men: Days of Future Past" stars Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Halle Berry, Nicholas Hoult, Ellen Page, Peter Dinklage, Shawn Ashmore, Omar Sy, Evan Peters, Daniel Cudmore, Bingbing Fan, Adan Canto, Booboo Stewart, Ian McKellen and Patrick Stewart.