The Last Stand was arguably the worst X-Men film as many of the main characters, including Professor Xavier, were killed off by Dark Phoenix. The post-credit scene of this film began to remedy this by showing that Xavier had moved his consciousness into an empty vessel. In the context of the first trilogy of X-Men films this is nothing spectacular; but this revelation changed the entire X-Men Universe by facilitating and enabling Patrick Stewart to return in Days of Future Past. Although we still dont quite know why he looks the same (and probably never will), this post-credit scene offers a slight salvation at the end of what is otherwise a poor film. This universe has now been wiped out and altered by the events of Days of Future Past, but the way that Xavier was shown to survive gave a slight hope of a sequel when the franchise appeared to be dying; this hope was mobilised by a flurry of new X-Men films, not starring Patrick Stewart, but his crucial inclusion to the latest X-Men film illustrates how fundamentally altering this post-credit scene was; it offers some semblance of an explanation when no other one has been provided to us.