The fifth episode of WandaVision was widely hailed as the best yet in a very unusual and ambitious piece of Marvel product. But surely the most astounding — and meme-able — moment came at the end: Elizabeth Olsen’s Wanda opened the front door of her ‘80s suburban home only to find her dead brother Pietro. Only catch? He wasn’t played by Aaron Taylor-Johnson. It was Evan Peters, who took the equivalent role — which is to say speedy Quicksilver — in Fox’s X-Men movies.