In a dystopian 2023, Professor Charles Xavier and his mutant kin stand on the precipice of extinction. The Sentinel programme, conceived by scientist Dr Bolivar Trask, has almost wiped out the mutant population and the human sympathisers. One glimmer of hope remains: if Kitty Pryde can propel Wolverine's consciousness back to 1973, he might be able to stop shape-shifter Mystique from assassinating Trask. This is the pivotal event, which lights the fuse on the Sentinel programme.
X-Men: First Class + X-Men: Days Of Future Past