Fans have been speculating about who - or what - could show up on WandaVision ever since the first episode of the Disney+ series aired, and it sounds like we can expect at least one major surprise on the same level as Luke Skywalker's cameo in the Season 2 finale of The Mandalorian.
The legendary Jedi's last-minute appearance came as a complete shock, and no one could believe that news of Mark Hamill's involvement didn't leak beforehand. When asked if WandaVision had anything similar in store during an interview with TV Line, star Elizabeth Olsen responded, "Yes," before adding that she was "really excited."
Writer Jac Schaeffer wasn't willing to divulge any more information, but did confirm that “there are so many surprises left in store” for the five remaining episodes, before encouraging "all fans to settle in, because there’s more coming.”
So, who could it be? Right now theories range from villains such as Mephisto (fans are even seeing that guy in the wallpaper), Ultron and Nightmare, to Wanda's late brother Quicksilver (be it Aaron Johnson or Evan Peters), and even Doctor Strange (Benedict Cumberbatch). The surreal, reality-warping nature of the show means the possibilities are almost endless, but chances are a cameo of the magnitude Olsen is teasing will be saved for the Season finale.
What do you guys think? Be sure to share your theories with us in the comments, and tune in for a brand new episode of WandaVision this Friday.