Summary
According to a wild new theory, Marvel Studios' upcomingAgatha All Alongseries could introduce Doctor Doom as the next major villain of theMCU. Kathryn Hahn was confirmed to be reprising her role of original Salem witch Agatha Harkness shortly after her debut in 2021’sWandaVision, and the newly-releasedtrailer forAgatha All Alonghas provided a first look at her upcoming solo adventure. As if Agatha Harkness and a new coven of witches wasn’t enough, one scene in the trailer could hint at Doctor Doom also making himself known inAgatha All Along.
Given Doctor Doom and the Scarlet Witch’s connection in Marvel Comics, it’s very possible that the iconic Fantastic Four villain could make his first appearance in theMCU’s upcomingWandaVisionspinoff. However, not even Elizabeth Olsen’s Wanda Maximoff has been revealed to be returning amongAgatha All Along’sstrong cast, though the series is expected to focus intensely on the Scarlet Witch’s effect on Agatha Harkness.While perhaps unexpected,Agatha All Alongcould be the perfect place to tease Doctor Doom’s debut in the MCU.

Theory: Castle Doom Was Revealed In The Agatha All Along Trailer
During one moment inAgatha All Along’strailer,Agatha Harkness and Billy Kaplanmake their way through a dark landscape and come across a mysterious castle in the distance. Some, including@CovenofChaoss, suspect that this castle might actually be Castle Doom, the home of Doctor Doom in Marvel Comics. While this is yet to be confirmed, and likely won’t be untilAgatha All Alongpremieres in September,the castle in the series' trailer and Castle Doom in the comics do share many similarities.
Just like Marvel Comics' Castle Doom, the castle inAgatha All Along’strailer sits atop a great hill. In the comics, the capital of Doom’s Kingdom of Latveria, Doomstadt, sits at the bottom of this hill, with his castle protruding from the center.While Doomstadt can’t be seen inAgatha All Along’strailer, it’s very possible that Agatha Harkness and Billy Kaplan’s journey could bring them to this town. Alternately, this could also be Doctor Doom’s other castle located in a twisted image of Upstate New York, which also bears a resemblance.

Scarlet Witch Is Connected To Doctor Doom In Marvel Comics
Long after the Scarlet Witch’s disappearance in Marvel Comicsfollowing the events ofHouse of MandDecimation, she was found residing in Castle Doom, and suffering from amnesia. During this period, Victor Von Doom and Wanda Maximoff had married, though her memories were soon restored, and this whirlwind romance reversed. This storyline would make perfect sense being adapted for the live-action MCU in the wake of theScarlet Witch’s run as a villainthroughWandaVisionandDoctor Strange in the Multiverse of Madness.
Wanda Maximoff tried to steal America Chavez’s power inDoctor Strange in the Multiverse of Madnessin hopes of finding a world where she could be with her sons, Billy and Tommy, who were erased at the end ofWandaVision.

The Scarlet Witch’s connection to Doctor Doom in Marvel Comics, and her connection to Agatha Harkness in the MCU, means the legendary Marvel villain could easily make an appearance inAgatha All Along. This could even markElizabeth Olsen’s return to the MCU, as she may be found residing inside Castle Doom with no memory of her previous life.In the comics, she seeks out Doom in an effort to resurrect her children, and the same story could unfold in the MCU.
Agatha All Along Could Set Up Doctor Doom As The MCU’s Next Big Villain
Throughout the Multiverse Saga, Marvel Studios built upKang the Conqueror and his variantsas the MCU’s primary antagonists. After Jonathan Majors' 2023 arrest, conviction, and firing from Marvel, however, there was some confusion about which direction the franchise would take. Kang could be recast, allowing him and his variants to still pose a major threat, whilethere has also been speculation that a new villain will be introduced to take his place. Doctor Doom would be the perfect candidate for this role.
Doctor Doom plays a prominent role in Marvel Comics’Secret Warsevent in 2015, which will form the inspiration behind the MCU’sAvengers: Secret Wars. Because of this, now is the best time to bringDoctor Doom into the MCU, andAgatha All Alongpresents a strong opportunity, as his intrinsic links to the Scarlet Witch and the world of magic in Marvel Comics makes the upcoming series a great fit for Doom. This could see Doctor Doom set up to be a villain in several upcoming projects, posing a threat for years to come.
Agatha All Along
Cast
Agatha Harkness, after the events of “WandaVision,” seeks to regain her magical powers. Joining forces with unexpected allies, including the son of an old adversary, she battles new mystical threats while uncovering hidden secrets in the magical realm.