Captain America: The Winter Soldier has already broken box office records this spring, kicking off yet another early summer blockbuster season. By all accounts the movie is quite good, too.

Now Marvel Comics fans are preparing for the second big Marvel movie of the summer, X-Men: Days of Future Past. This week 20th Century Fox revealed even more of the latest X-Men movie in the third and final trailer for Days of Future Past.

Where previous trailers for the movie had focused on action an intrigue, this latest one focuses more on story beats and showing nearly every mutant that appears in the film. As such, the new trailer could very well be considered to contain spoilers.

X-Men: Days of Future Past is based on a classic Uncanny X-Men storyline from the early 80s. In the comics, mutants in the future are hunted and rounded up in a dystopian holocaust-analogy future that comics fans are all too familiar with. Unable to battle the human-created Sentinels head-on, Kitty Pryde is sent back through time to stop a key assassination that sets that disappointing future into motion.

Though Ellen Page’s Kitty Pryde will be featured in the X-Men: Days of Future Past, the movie version of the tale will focus more heavily on Hugh Jackman’s Wolverine. Other returning cast members from the original X-Men movies include Halle Berry as Storm, Patrick Stewart as Professor Xavier, and Ian McKellen as Magneto.

X-Men: Days of Future Past is being directed by Bryan Singer, the man who helmed X-Men and X2: X-Men United before stepping aside. Without Singer leading the franchise the series’ quality quickly plummeted with movie such as X-Men: The Last Stand and X-Men Origins: Wolverine. In addition to Days of Future Past, Singer will also be directing X-Men: Apocalypse, a movie scheduled for release sometime in 2016.

X-Men: Days of Future Past will be released in the U.S. on May 20.