Paul Bettany says some fan theories attempting to figure out the mystery behind WandaVision are "eerily accurate" — but he'll be damned if he says anything about Mephisto. The devilish Marvel Comics supervillain is suspected by some to be the secret Marvel character still to be revealed in the final three episodes of WandaVision, where the devil might be in the details when it comes to "Queen Cul-de-Sac" Dottie Jones (Emma Caulfield). That's if the scheming demon isn't posing as "Uncle Pete" (Evan Peters), the supposedly "recast" twin brother of Wanda Maximoff (Elizabeth Olsen) who shows up as a very special guest star seemingly from beyond the grave.