Let me tell you the plot of this big summer movie! It's about a kid who needs to survive to the future so he can help win a bloody war against a crew of supersmart robots. So he (in the future) sends a badass warrior to the past to protect him against a shapeshifter.
Well, you've already watched both movies AND the Honest Trailer above so you know that it's both Terminator 2: Judgment Day and X-Men: Days of Future Past. But hey, they're both awesome, so who cares?