Thanks to episode 8 of Marvel Studios’ first Disney+ series, this WandaVision theory might have solved the debate regarding when we’ll see the X-Men and the rest of the mutants in the MCU! And it’s all thanks to the trip down memory lane Agatha Harkness forced the Scarlet Witch herself Wanda Maximoff to go on involving a very important moment in her and Quicksilver’s origin story!