Avengers: Doomsday Reportedly Features 6 Universes: Every Universe, Explained

Avengers: Doomsday is expected to be the MCU‘s biggest multiversal crossover yet. We know that three realities will collide in the film. But a recent Q&A from scooper Alex Perez claims the movie could ultimately span as many as six different universes. According to Perez, those include the main MCU, the Fantastic Four’s home reality, the X-Men universe, Victor von Doom’s (better known as Doctor Doom) original universe, Tobey Maguire’s Spider-Man universe, and a mysterious hidden pocket dimension.

Some of these worlds have already appeared in Marvel Studios projects, while others remain firmly in rumor territory. Here’s everything we know about each of the reported universes and why they could matter when Doctor Doom launches his assault on the Marvel multiverse.

Quick reference:

Field	Details
Title	Avengers: Doomsday
Directors	Anthony Russo and Joe Russo
Premise	Heroes from Earth-616, the Fantastic Four’s universe, the X-Men’s reality and other corners of the multiverse unite to stop Doctor Doom from reshaping existence. It sets the stage for Avengers: Secret Wars.
Main Cast	Robert Downey Jr., Chris Evans, Chris Hemsworth, Pedro Pascal, Vanessa Kirby, Joseph Quinn, Ebon Moss-Bachrach, Anthony Mackie, Letitia Wright, Simu Liu, Paul Rudd, Florence Pugh, Sebastian Stan, David Harbour, Tom Hiddleston, Patrick Stewart, Ian McKellen, James Marsden, Rebecca Romijn, Alan Cumming, Kelsey Grammer, Channing Tatum, and more.
Release Date	December 18, 2026

1 Earth-616 Is Still the Heart of the MCU

No matter how many alternate realities enter the picture, Earth-616 remains the center of the Multiverse Saga. This is the primary Marvel Cinematic Universe that audiences have followed since Iron Man in 2008 and the home of Sam Wilson‘s Captain America, Thor, Doctor Strange, Spider-Man, Shuri’s Black Panther, and the recently formed New Avengers.​

Marvel has already confirmed that Avengers: Doomsday will bring together heroes from multiple realities. But Earth-616, like in the comics, remains the anchor around which everything else revolves. It is also the universe most threatened by incursions, the catastrophic collisions between realities first explained in Doctor Strange in the Multiverse of Madness.

In the Infinity Saga, the threat came from outside in the form of Thanos. In the ongoing Multiverse Saga, the threat (Doctor Doom) has gradually revealed Earth-616 itself to be the catalyst for a much larger crisis. The factors include Loki’s decision to replace the Temporal Loom, Doctor Strange’s repeated incursions into other realities, and Spider-Man’s fractured spell in Spider-Man: No Way Home. Several of the saga’s biggest events have destabilized the multiverse in one way or another. Whether intentional or not, Earth-616 has become the crossroads where seemingly separate storylines converge.

2 Earth-828 Brings the Fantastic Four Into the Fold

The retro-futuristic home of the Fantastic Four is called Earth-828. And since Doctor Doom was explicitly shown in the mid-credits of The Fantastic Four: First Steps, we know this particular alternate universe will play a major role in Avengers: Doomsday. The reality is home to Reed Richards, Sue Storm, Johnny Storm, and Ben Grimm. Together called Marvel’s First Family, their arrival in the MCU marks one of the biggest additions to the franchise since the Infinity Saga.

Unlike Earth-616, Earth-828 has developed with a distinctly futuristic aesthetic (like the Fallout franchise) and exists independently of the main MCU timeline. The movie also introduced Galactus and Franklin Richards into the Multiverse Saga. These are two characters whose importance could extend well beyond The Fantastic Four: First Steps.

Given Reed Richards’ unparalleled scientific understanding of the multiverse, his universe is expected to become one of the key battlegrounds against Doom. Marvel has already confirmed the Fantastic Four will be among the central players in Avengers: Doomsday.

3 The X-Men Universe Could Finally Cross Over With the MCU

The return of the X-Men may be one of Avengers: Doomsday‘s biggest selling points. Marvel has already confirmed that Patrick Stewart, Ian McKellen, James Marsden, Rebecca Romijn, Alan Cumming, and Kelsey Grammer are all returning for the film. This effectively brings Fox’s mutant legacy into the MCU.

It is not clear yet from what universe these mutants hail. Despite the popular belief among the fans that they come from Fox’s X-Men universe (which the MCU now has after Disney’s Fox acquisition), the official name of the reality has not been provided by Marvel Studios.

The post-credit scene in The Marvels further complicated matters by placing Monica Rambeau inside an alternate universe inhabited by Beast (Grammer) and Binary (Lashana Lynch), her mother, who died in her universe and is alive in this one. It seems like Marvel might introduce a new version of the mutant universe, albeit featuring several familiar faces.

Whatever its official name will be, the X-Men universe looks set to become one of the key universes in the upcoming multiversal war.

4 Doctor Doom’s Original Universe May Hold the Biggest Secret

Perhaps the most intriguing entry in Alex Perez’s report is Doctor Doom’s original universe, his homeworld. Marvel has confirmed Robert Downey Jr. will portray Victor von Doom, but almost nothing has been revealed about where this version of the iconic villain actually comes from. Well, we know he will boast numerous powers and abilities. Unlike previous villains, it is almost certain that Doom is not part of Earth-616, which gives him a different take on how the multiverse and its destruction affect him.

Perez’s latest comments suggest Doom’s home reality could play a major role in the film’s story. If this universe has gone through an incursion, this will be a good reason for his desire to reshape reality before Avengers: Secret Wars. At this point, we don’t know what Doctor Doom’s reality would look like, but it could be a world where Victor rose to power long before becoming the multiverse’s greatest threat.

5 Tobey Maguire’s Spider-Man Universe Could Return Once Again

One of the more nostalgic surprises in Perez’s report is the inclusion of Tobey Maguire‘s Spider-Man universe. It has not been confirmed by Marvel Studios, but Maguire’s Spider-Man’s presence is heavily rumored.

The Sam Raimi trilogy officially became part of the MCU canon through Spider-Man: No Way Home. The movie reunited Maguire and Andrew Garfield with Tom Holland‘s Peter Parker during the multiversal crisis. That film established that the Raimi universe continues to exist independently even after the events of the crossover.

If Perez’s claims are proven true, then the film might actually pay tribute to the Raimi universe instead of only bringing back its Spider-Man to Earth-616.​

As there are already several legacy characters among the Doomsday cast, it will make sense to incorporate the Raimi universe in Marvel’s current narrative.

6 The Hidden Parallel Dimension Is the Biggest Mystery

The final location is also the most mysterious. Alex Perez corrected himself after calling it a “pocket universe”. He said it is “the universe that’s hidden away.” It may actually be a concealed, isolated realm existing outside the conventional multiverse.

There are plenty of such locations in Marvel Comics and also the MCU: the Void featured in Loki, the Quantum Realm in Ant-Man and the Wasp, and others. Whether this location is one of the previously mentioned realms or a completely new place is not known.

A number of fans have speculated about this enigmatic location being the place that will eventually connect the universe to Battleworld, ruled by Doctor Doom in the Secret Wars in the Marvel Universe (comics). Nonetheless, so far, there is no proof for such a hypothesis, making it a mystery.

Here is every Avengers: Doomsday universe, summarized:

UniverseKey Characters/TeamsStatusDescription

Earth-616 (Main MCU)	Sam Wilson’s Avengers, Doctor Strange, Spider-Man, Thor, Shuri, Hulk	Officially confirmed	The primary MCU timeline and the storytelling center of the Multiverse Saga.
Earth-828 (Fantastic Four Universe)	Reed Richards, Sue Storm, Johnny Storm, Ben Grimm, Galactus, Franklin Richards	Officially confirmed	The retro-futuristic home of the Fantastic Four.
The X-Men Universe	Professor X, Magneto, Deadpool, Wolverine, Beast, Cyclops, Mystique, Nightcrawler and other mutants	Officially confirmed (exact designation unknown)	Brings Marvel’s mutants into the MCU.
Doctor Doom’s Original Universe	Victor von Doom	Rumored	Doom’s home reality could explain his motivations and why he seeks to reshape the multiverse.
Tobey Maguire’s Spider-Man Universe	Peter Parker (Tobey Maguire), J. Jonah Jameson	Rumored	The Sam Raimi universe was introduced to the MCU in Spider-Man: No Way Home.
Hidden Parallel Dimension	Unknown	Rumored	Alex Perez describes it as a hidden reality rather than a conventional universe. It could be an isolated realm like the Void or Quantum Realm.

Which universe are you most excited to revisit in Avengers: Doomsday? Let us know in the comments below!

Avengers: Doomsday hits theaters in the US on December 18, 2026.