'X-Men: Days of Future Past'
'X-Men: Days of Future Past' has a lot of moving parts -- it's based on a comic book, it combines both casts of the original 'X-Men' movie trilogy and that of 'First Class,' and there's some pretty unique time traveling going on -- so it's understandable if those unfamiliar with the franchise or the story get a bit lost. That's where we come in! We give you everything you need to know about 'X-Men