(Spoilers from Marvel Studios and Disney+’s WandaVision will be found below.)

Following Evan Peters’ surprise arrival on WandaVision as Wanda’s previously dead brother Pietro, fans were filled with all kinds of question about the show’s use of the Multiverse and whether it would bring the X-Men into the MCU now that Disney owns the rights to the characters. Heck, by the next episode, Pietro was decked out in a Halloween costume that clearly aped Quicksilver’s original look from the comics. But while the costume should’ve made fans go further down the X-Men rabbit hole, there was a prevailing theory that Pietro’s hairs looked like horns and was actually a visual clue that he’s secretly Mephisto.