WandaVision is packed with Easter eggs and references to other MCU characters and events, but there are also many that hint at the possible villain of the series: Mephisto, and here’s every reference so far. The Marvel Cinematic Universe reached its peak with Avengers: Infinity War and Avengers: Endgame, and now that the Infinity Saga has come to an end with Spider-Man: Far From Home, this universe is ready to move forward with new stories and characters. The highly-anticipated Phase 4 will not only cover movies but also TV shows, all set to stream on Disney+, and kicking off this new era is WandaVision.

Set after the events of Avengers: Endgame, WandaVision follows Wanda Maximoff/Scarlet Witch (Elizabeth Olsen) and Vision (Paul Bettany) as they live an idyllic suburban life in the town of Westview, but viewers soon learn that this seemingly perfect life isn’t what it seems, and the truth behind Westview and its residents might be too dark and complex. Each WandaVision episode is done in the style of sitcoms from different decades, and there have been clues in every episode pointing at Wanda not acting alone in all this. While she’s in control of most things that happen in Westview and she was initially believed to be the villain of the show, Wanda might not be in full control, as hinted when her deceased brother, Pietro/Quicksilver (Evan Peters) returned, but in a different body.

Related: Marvel Confirms When WandaVision Is Set In The MCU Timeline

Of course, WandaVision has already made way for various fan theories on what’s happening at Westview, how much control Wanda has over the town and its residents, and who is the real villain of the series, and all signs point at one character from Marvel Comics who hasn’t appeared in the MCU yet: Mephisto. This demon can use his powers to project illusions, manipulate memories, and alter time, which fits with what has happened so far, and in addition to all that, he has a connection with Wanda in the comic books, though that one had a tragic end. Here’s every Mephisto reference in WandaVision and what they mean.

“The Devil Is In The Details”

WandaVision episode 2 Dottie

WandaVision episode 2 introduced viewers to Dottie (Emma Caulfield), the neighborhood’s queen bee, who wasn’t the nicest person in town. Dottie’s appearance and personality raised many questions about her, but there’s one line that made fans suspect she might be Mephisto. During the fundraising meeting with the rest of the neighborhood, Dottie said that “the devil’s in the details", with Agatha (Kathryn Hahn) adding that “that’s not the only place he is”. Although this is played off as a joke, it still feels out of place and made Dottie even more suspicious to the eyes of fans, who believe she isn’t a real person and is instead Mephisto in disguise. This could have been the first hint at Mephisto being near Wanda and possibly in control of Westview, and might be even blending in with the crowd in order to have more control over Wanda and everything else.

Hidden 666

WandaVision 666 reference

As Mephisto is Marvel Comics’ very own devil, he has been linked to different “666” references that have appeared throughout WandaVision. Every episode has included a fake commercial, all of them representing different events and characters from Wanda’s life, as well as some hints at what is really happening in Westview. In episode 1, for example, the commercial was for a new toaster made by Stark Industries, which links directly to Wanda’s backstory as her parents were killed when their apartment was struck by mortar fire, and she and Pietro spent two days trapped in the rubble, staring at an unexploded bomb with the Stark Industries logo on it. Now, in one of the shots showing the toaster in all its splendor, a peculiar design can be seen on it, which once it’s turned upside down is a “666”, the number commonly related to the devil.

There’s also “The Hex”, which is the forcefield around Westview in the shape of a hexagon. While this is mostly a reference to Wanda’s powers in the comics, such as the “hex bolts”, many fans have taken it as a subtle reference to 666 and thus one to Mephisto himself. Other eagle-eyed fans have pointed out that the number six is mysteriously missing whenever something turns red, which has been used as a hint to Wanda’s fake reality fracturing due to the intervention of outsiders, as happened when Dottie cut her hand after Jimmy Woo called for Wanda through the radio and with the S.W.O.R.D. helicopter that crashed in front of Wanda’s house. They have also noticed that in the official posters the old television is also missing the number 6, and these could all be subtle references to the one and only Mephisto.

Related: How WandaVision’s Yo-Magic Commercial Connects To Scarlet Witch's Past & Future

Wanda’s Pregnancy

wanda and vision sit on the couch with doctor as babies are about to be delivered

Perhaps the biggest hint at Mephisto’s presence in WandaVision is Wanda’s pregnancy. By the end of episode 2, Wanda was suddenly pregnant, and in episode 3 she gave birth to twin boys: Tommy and Billy. Her pregnancy happened too fast and the twins also grew up alarmingly fast, and they were even able to control how much they aged. Now, in the comics, Wanda also has twins, but to achieve that, as Vision can’t reproduce as he’s an android, she used her reality-warping powers to make it happen, but in the process, she unintentionally used fragments of the soul of Mephisto to create the twins. Billy and Tommy eventually disappeared when Mephisto reabsorbed them, which drove Wanda insane. Within the MCU, this could be the trigger of the “multiverse of madness”, thus connecting with Doctor Strange 2, as Wanda is set to return to the big screen in that movie.

Quicksilver Calls The Twins “Demon Spawn”

WandaVision episode 6 Tommy Billy

Now jumping to episode 6, Quicksilver had a very peculiar name for Billy and Tommy. Quicksilver made his first appearance in WandaVision right at the end of episode 5, much to the surprise of viewers and Wanda herself as this Pietro is played by Evan Peters rather than by Aaron Taylor-Johnson, who played the character in Avengers: Age of Ultron. This “recast” has raised many questions and has made some wonder if Quicksilver could be the villain in disguise, just like Dottie was. This suspicion was only made bigger when in episode 6 Quicksilver told Tommy and Billy to “unleash hell, demon spawn!” and even mentioned that “the kids need a father figure” when Vision left to patrol the streets with the neighborhood watch. This is another reference to Tommy and Billy being part of Mephisto, and further supports the theory that Quicksilver might actually be Mephisto.

The Coronet Theater

Wanda and Pietro on Halloween in WandaVision

A possible reference to Mephisto might be hiding in the background of a scene in episode 6. When Wanda and Pietro take the twins trick-or-treating around the neighborhood, a cinema can be seen in the background, with the billboard revealing two movies that could also hint at what’s really happening in Westview: The Parent Trap and The Incredibles. The Parent Trap is all about fake identities and switching places, which could be the case for Quicksilver if he’s either Mephisto or the Pietro Maximoff from another part of the multiverse, while the Incredibles is a more in-your-face reference to characters with superpowers. However, the real Mephisto reference here is the name of the cinema: Coronet, which as noted by Den of Geek, is the title of a poem by Andrew Marvell. The metaphysical poem is about a man who wants to make a new crown for Christ’s head as he, as a sinner, contributed to his crucifixion, but comes across with the serpent a.k.a. the devil. While Mephisto isn’t the Biblical devil, this could be a subtle and clever reference to him being present in Westview, which along with that peculiar selection of movies showing at the Coronet cinema, might point at him being the true villain in WandaVision.

Next: WandaVision Theory: Doctor Strange Breaks Wanda Out Of Her Fantasy