Regarding Mystique and Charles
So, only yesterday decided to watch this movie, and sorry, if this question has been posted before, but I've got to ask.
So, in X-Men 2 we see Mystique infiltrating the X-Men school and injecting some sort of a serum into cerebro, which paralysis Charle's brain when he uses it in order to find the mutants. While in X-Men: First Class we see that Mystique and Charles are living like brother and sister and even part on good terms. So, what the hell happened?