On Wednesday night, Marvel Studios made a grand spectacle of announcing the cast for Avengers: Doomsday in a rather unconventional manner—by unveiling the chairs of each cast member. The reveal confirmed the return of The Thunderbolts, The Fantastic Four, and Simu Liu’s Shang-Chi, but the most shocking revelation was the inclusion of characters from Fox’s X-Men films. Kelsey Grammer, Patrick Stewart, Ian McKellen, Rebecca Romijn, Alan Cumming, Channing Tatum, and James Marsden are all set to appear, indicating that directors Joe and Anthony Russo are aiming to replicate the epic scale of Avengers: Infinity War and Endgame.
Since the announcement, the internet has been buzzing with speculation about the film’s storyline. While no official plot details have been confirmed, several theories have emerged that attempt to piece together what Avengers: Doomsday could be about.
A clash of worlds: Avengers vs X-Men
One of the most widely discussed theories suggests that the film will draw inspiration from Marvel’s Avengers vs X-Men comic series. The story is said to revolve around the concept of a Final Incursion, where Earth-616 and an alternate X-Men universe—possibly a continuation of the timeline established in X-Men: Days of Future Past—find themselves on a collision course. With Deadpool and Wolverine thrown into the mix, the two realities will mistakenly perceive each other as threats, leading to an all-out war between the Avengers and the X-Men.
The return of The Void and Monica Rambeau’s key role
{{/usCountry}}One of the most widely discussed theories suggests that the film will draw inspiration from Marvel’s Avengers vs X-Men comic series. The story is said to revolve around the concept of a Final Incursion, where Earth-616 and an alternate X-Men universe—possibly a continuation of the timeline established in X-Men: Days of Future Past—find themselves on a collision course. With Deadpool and Wolverine thrown into the mix, the two realities will mistakenly perceive each other as threats, leading to an all-out war between the Avengers and the X-Men.
The return of The Void and Monica Rambeau’s key role
{{/usCountry}}Another theory suggests that characters from The Void will make a return, along with Monica Rambeau (payed by Teyonah Parris). It is believed that the alternate reality she ended up in during The Marvels will play a crucial role in triggering the clash between the two universes. Meanwhile, on Earth-616, Captain Marvel will form an alliance with Shang-Chi, Hulk, and Wong in an attempt to bring Monica back, while Ms. Marvel embarks on her own mission to recruit a team of heroes.
Hulk vs Wolverine and Spider-Man’s symbiote suit
Fans of the MCU have long speculated about a showdown between the Hulk and Wolverine, and Avengers: Doomsday could finally deliver this long-awaited battle. Meanwhile, Spider-Man is rumoured to be reluctant to get involved in the conflict but will ultimately have no choice. He is expected to don a new Symbiote suit, which could be a variation of the final costume seen in Spider-Man: No Way Home, but in a striking black-and-white colour scheme.
Doctor Doom and the TVA’s collapse
Doctor Doom is said to be another key figure in the story, with reports suggesting that he will hold Kang and the TVA responsible for the chaos unfolding in the multiverse. This could lead to a full-scale war within the TVA itself, setting up a climactic battle in which Loki plays a pivotal role.
While none of these theories have been officially confirmed, they provide an exciting glimpse into what Avengers: Doomsday could explore. With the stakes higher than ever, fans can only speculate about how the multiversal chaos will unfold. Until Marvel Studios decides to reveal more, the best way to deal with the anticipation is by embracing the endless possibilities of where the story might go.