Warning: The following contains spoilers for episode 3 of Agatha All Along.
It's finally happened: Mephisto has been mentioned in the MCU! During the third episode of Marvel's new series Agatha All Along, titled 'Through Many Miles of Tricks and Trials,' the fan-favorite comic book demon was mentioned.
In fact, as Agatha All Along creator Jac Schaeffer tells GamesRadar+ and the Inside Total Film podcast in an interview, this name is explicitly dedicated to all those fans who continually theorized that Mephisto was secretly lurking in WandaVision. When Schaeffer was asked if it was a “nod” to those theories, she replied, “That was a nod, definitely, yeah.”
Speaking further about fan theories, Schaeffer reveals that they play a role in shaping the series. While they don't inform the plot itself, the writer/director says she reads them to see what exactly appeals to fans. After all, we wouldn't have Agatha All Along if fans didn't respond so positively to Kathryn Hahn's cackling witch in WandaVision.
As Schaffer tells us, “Fan theories themselves don't influence the plot like I do or Marvel does. I actually like to think about what it is that draws people in, what it is that excites them, and if it's what excites me.”
“That's where I feel like I'm successful and my team is successful, when we can find that sweet spot where we're excited, it makes our brains tick and it makes us want to dress up, but it also has that effect on the fans.”
New episodes of Agatha All Along are released weekly on Disney Plus. To stay up to date, check out our Agatha All Along release schedule, and you can read our thoughts on the series with our Agatha All Along review.