Avengers: Age of Ultron.
WandaVision completely confounded expectations, though, when the ‘wrong’ Quicksilver rang the doorbell, as it was Evan Peters from Fox’s
X-Men movies.
Few thought that these two cinematic universes would cross over like this, and in an interview with Marvel.com, showrunner Jac Schaeffer explained how they made it happen, saying:
“We loved the idea of [bringing him back]. And then we were like, how in the world are we going to make this make logical sense? Like, how do we justify this? Because that’s the thing, you can hatch a million great ideas, but to make them land, to make them be grounded, to make them feel organic to the larger story… This show is such a mind scramble, and because it’s working on so many levels, and there’s so many notions of what’s real and what’s not, and performance, and casting, and audience, and fandom, and all of that, we just thought it would be the biggest thrill to bring Evan over to the Marvel Cinematic Universe.”