Evan Peters (American Horror Story, One Tree Hill) has joined the cast of X-Men: Days of Future Past. According to Bryan Singer, he’s playing Quicksilver. In the comics, Quicksilver is the son of Magneto, and the brother of Scarlet Witch. It will be interesting to see how he works into the overall plot of the movie, given that both Ian McKellan and Michael Fassbender are returning. Whose son is he?