Holy mother of fuck. What a way to merge the X-Men universe with our MCU. Just fucking fantastic, whoever had the original idea for this moment (probably Feige) is a damn genius. I went from being really excited all episode to see who this apparent big cameo was, to being a little disappointed but still satisfied that it was Quicksilver (Aaron Taylor Johnson), holy fuck meltdown mode realizing it's Evan Peters' Quicksilver and the implications that come with that.
Like, this by extension establishes contact between Magneto, Professor X, Wolverine, and our MCU of Iron, Thor and Cap. I actually can't believe it and they did it in the best way possible.