X-Men: Days of Future Past

In the future, the mutants and the humans who help them are slaughtered by powerful robots named Sentinels. Professor Xavier, Wolverine, Magneto, Storm, Kitty Pryde, and her friends meet at a monastery in China and Xavier explains that the invincible Sentinels were created using the DNA of Mystique that was captured in 1973 when she tried to assassinate their creator Dr. Bolivar Trask. Xavier tells that their only chance is return to 1973 using Pryde