'X-Men' Are Fighting Extinction In New Trailer

20th Century Fox has just released a new trailer for "X-Men: Days of Future Past" and it's great.

This is probably the summer movie we're looking most forward to not only because it's been three years since "X-Men: First Class," but because it reunites a lot of actors from the 2006 film "X-Men: The Last Stand" as well.

Patrick Stewart, Ian McKellen, Jennifer Lawrence, James McAvoy, Michael Fassbender, and Halle Berry are among the stars in the sequel.

This time around, the group will team up with their younger selves to take down a force threatening to extinguish all of the mutants.

"X-Men: Days of Future Past" is in theaters May 23.