Last week, a six-second teaser for X-Men: Days of Future Past was released and looked pretty cool. It stands to reason then that this full trailer will be 23 times better. As you can see, the film features cast members from both X-Men: First Class (Michael Fassbender, Jennifer Lawrence, James McAvoy, etc.) and from the original X-Men film trilogy (Hugh Jackman, Patrick Stewart, Halle Berry, etc.). Based on a very popular series in the comics, the movie is about future X-Men working with X-Men in the past to change the past to save the future. The film is scheduled to open on May 23, 2014. Hopefully it will be great and we won't need X-Men to go back in time to stop the film's production.