The multiverse is no longer just a strange concept in the Marvel Cinematic Universe. In Avengers: Doomsday, it appears to be central to the story. Disney’s official description says heroes from three distinct universes will be placed on a deadly collision course while facing an existential threat unlike anything they have encountered before. The movie is currently scheduled for release on December 18, 2026.
That setup raises a much bigger question than who will fight Doctor Doom. What actually happens when two Marvel universes collide?
Marvel Comics has already explored an extreme version of this idea through the 2015 Secret Wars storyline. In that story, incursions cause universes to move toward catastrophic collisions, and the final collision between the Marvel Universe and the Ultimate Universe destroys both. What remains becomes Battleworld, a patchwork reality made from fragments of destroyed dimensions.
The MCU does not have to reproduce that storyline exactly. Marvel has not confirmed that Doomsday will feature the same type of final incursion or the same outcome.
However, the comics provide a useful framework for understanding what a multiversal collision could mean.
If universes really begin crashing into one another, the consequences would go far beyond a superhero battle. Entire worlds, civilizations and histories could be placed at risk.
Why Are Multiple Universes Colliding?
The exact reason multiple universes are involved in Avengers: Doomsday has not been fully revealed.
What is confirmed is that the movie involves heroes from three distinct universes and an existential threat. Disney’s official synopsis deliberately keeps the details broad, so there is currently no official explanation confirming exactly what causes the universes to come into conflict.
Marvel Comics, however, provides one important precedent: incursions.
In the 2015 Secret Wars storyline, dimensions begin breaching their boundaries and coming into contact with one another. Marvel explains that when these realities collide, both can be destroyed. The story eventually builds toward the final collision between Earth-616 and the Ultimate Universe.
That does not mean the MCU will use exactly the same mechanism.
The movie could adapt the basic idea while changing what causes the collision or how the different universes interact. Doctor Doom could potentially be connected to the crisis, but his exact role in causing or responding to the collision remains unconfirmed.
The important point is that multiple universes create a problem that cannot be solved by protecting only one Earth.
If the boundaries between realities begin breaking down, every universe involved could become part of the same crisis.
What Is a Multiversal Collision?
A multiversal collision is essentially what happens when separate realities come into direct contact in a way that threatens their continued existence.
In Marvel Comics, the term most closely associated with this concept is an incursion. Marvel’s official Secret Wars guide explains that Earth-616 becomes involved in a catastrophic collision course with other Earths from the multiverse. When dimensions breach their boundaries and come into contact, both can be destroyed.
That is very different from ordinary travel between universes.
Characters such as heroes with multiversal abilities can potentially visit another reality without that automatically destroying either universe. An incursion represents something much more dangerous: the boundaries between realities have become unstable enough that their continued coexistence is threatened.
The 2015 Secret Wars comics push this concept to its extreme.
As incursions eliminate alternate universes one after another, the Marvel Universe and Ultimate Universe eventually collide. Marvel describes the result as the destruction of both realities, followed by the creation of Battleworld from fragments of devastated dimensions.
So, if Avengers: Doomsday adapts a similar concept, a collision would not necessarily mean two universes simply becoming one.
It could mean that the realities themselves become unstable and ultimately cease to exist in their original forms.
Can Two Marvel Universes Exist in the Same Reality?
Marvel’s multiverse shows that different universes can exist simultaneously without automatically destroying one another.
That is the entire basis of a multiverse: separate realities can have different histories, characters and versions of familiar places while remaining distinct.
The problem begins when the boundaries separating those realities break down.
Marvel’s Secret Wars material provides a clear example. Different universes exist independently, but during the incursion crisis, their dimensions begin breaching those boundaries. Once two realities come into contact in the destructive manner described by the story, both can be destroyed.
This means that simply having two universes exist at the same time is not the problem.
The problem is how they interact.
The MCU has already established the idea of alternate realities and variants, but Doomsday appears to raise the stakes by bringing heroes from distinct universes into the same larger conflict. Disney’s official description confirms the presence of three distinct universes, although it does not explain exactly how those realities will interact.
Therefore, it would be inaccurate to say that two Marvel universes cannot exist in the same reality under any circumstances.
They can coexist as separate universes.
What becomes dangerous is when the barriers between them fail.
What Happens to People When Their Universe Disappears?
The consequences for ordinary people could be catastrophic.
If a universe is completely destroyed, everyone and everything inside that universe would normally be lost with it. Marvel’s Secret Wars storyline demonstrates just how extreme the consequences of multiversal destruction can become: entire realities are eliminated through incursions, leaving only fragments of what existed before.
However, Marvel Comics also shows that survival can sometimes be possible.
Before the final incursion in Secret Wars, Reed Richards and the Future Foundation create a life raft designed to allow selected people to survive the destruction of their universe. Marvel’s official account explains that these survivors eventually reach Battleworld after the final incursion.
That means the destruction of a universe does not necessarily have to mean that every individual instantly disappears from the story.
Some people could potentially survive through technology, extraordinary powers or other multiversal mechanisms.
But that does not mean an entire population can simply be rescued.
The very nature of an incursion makes the problem enormous. If complete universes are being destroyed, saving billions of people would require a solution operating on a scale far beyond ordinary superhero rescue missions.
That is one reason a multiversal crisis could become an existential threat in Avengers: Doomsday.
Could One Universe Destroy Another by Existing Too Close?
In the Marvel Comics version of incursions, yes, the interaction between universes can become directly destructive.
Marvel’s official explanation of Secret Wars says that dimensions were breaching their boundaries and that once they came into contact with one another, both were destroyed.
The key point is that this is not simply about physical distance.
Two universes are not like two planets moving closer together in ordinary space.
They are separate realities.
An incursion is instead a breakdown of the separation between those realities, producing a situation in which their existence becomes incompatible.
The final incursion in Secret Wars is particularly important because Earth-616 and the Ultimate Universe collide, and neither survives the event in its original form. Marvel’s official description of Secret Wars explicitly identifies this final collision as the event that leads to Battleworld.
Whether the MCU will use exactly this mechanism is unknown.
Still, it gives viewers a useful idea of how serious the multiversal threat could become if Doomsday adapts the concept.
The danger would not simply be that one universe invades another.
The danger could be that the existence of the two realities together becomes impossible.
Why Can’t Everyone Simply Move to a Different Universe?
Moving to another universe sounds like an obvious solution until the scale of the problem is considered.
A universe can contain an enormous number of people, civilizations, planets and ecosystems. Even if heroes discover a way to travel between realities, that does not automatically provide enough space or resources to relocate everyone.
Marvel Comics has explored selective survival rather than universal evacuation.
In the lead-up to the final incursion in Secret Wars, Reed Richards and others create a life raft that allows a limited group of survivors to escape the destruction of their universe. Marvel’s official account makes clear that only a select group is saved in this way.
That distinction is important.
Multiversal travel and multiversal evacuation are completely different problems.
A portal might allow one person, a team or even a larger group to cross into another reality. That does not mean billions of people can be moved before an entire universe disappears.
There is also another problem: where would they go?
If several universes are being threatened simultaneously, another universe might not remain safe for long.
That is why a multiversal crisis cannot necessarily be solved simply by finding another Earth and moving there.
The heroes would need to address the underlying cause of the collapse.
How Would Governments React to a Multiversal Crisis?
The MCU has not revealed how governments would respond to a multiversal collision in Avengers: Doomsday, so any detailed prediction would be speculation.
However, a genuine multiversal crisis would create problems far beyond the normal responsibilities of governments.
Imagine governments suddenly learning that another Earth exists and that its population is entering the same reality. Questions about borders, resources, military security and communication would become almost impossible to answer.
The situation would become even more complicated if the other universe contained different versions of familiar nations, governments or political systems.
But the most serious issue would be survival.
If an incursion threatens the existence of an entire universe, conventional military power may have very limited value. Governments could potentially protect cities or populations from immediate physical dangers, but stopping the destruction of reality itself would require capabilities far beyond ordinary institutions.
That could explain why characters with scientific, mystical and cosmic knowledge would become so important.
The Avengers might be dealing with the crisis at the level of individual battles, while scientists and other specialists attempt to understand what is happening to the structure of reality.
Still, these are possibilities rather than confirmed Doomsday plot points.
Marvel has not publicly explained how governments will respond to the multiversal threat.
Could Ordinary Humans Survive a Universes Collide?
Ordinary humans could potentially survive if they are far enough removed from the destructive event or if they have access to some form of protection.
But if the collision follows the catastrophic incursion model from Marvel Comics, survival would become extremely difficult.
The 2015 Secret Wars storyline shows that when the final incursion occurs, the two remaining universes are destroyed. A limited number of characters survive because they have access to specially constructed life rafts designed to withstand the event.
That suggests that ordinary civilians would be at a major disadvantage.
Most people would not have access to the technology, knowledge or resources necessary to escape a collapsing universe.
The MCU could also choose a different approach.
For example, Doomsday might show portions of different realities being brought together rather than having entire universes disappear immediately. In that case, ordinary people might find themselves living through a much more complicated disaster involving strange environments, displaced populations and unfamiliar versions of their world.
But there is no official confirmation that this will happen.
What can be said with confidence is that a multiversal collision would be far more dangerous than an ordinary invasion because the threat would involve the structure of reality itself.
What Could Happen After the Collision in Avengers: Doomsday?
The consequences of a multiversal collision could determine the direction of the MCU’s next major Avengers story.
Marvel has not revealed the ending of Avengers: Doomsday, so it would be inappropriate to claim that a specific outcome is confirmed.
However, Marvel Comics provides several possible models.
The most famous is the 2015 Secret Wars scenario. After the final incursions destroy the remaining universes, Battleworld exists as a patchwork reality made from fragments of destroyed dimensions. Doctor Doom rules this world as its master.
That is why Battleworld is frequently discussed when considering the possible connection between Doomsday and Secret Wars.
Another possibility is that the MCU could adapt the basic concept without creating the exact comic-book version of Battleworld.
The collision could instead fracture reality, combine selected elements of different universes or leave the surviving heroes in a fundamentally altered multiverse.
Any of these outcomes could create a direct path toward Avengers: Secret Wars.
The important distinction is between what Marvel has confirmed and what the comics suggest.
Disney has confirmed that Doomsday involves heroes from three distinct universes facing an existential threat. Marvel Comics has established that incursions can lead to universe-destroying collisions and, in the 2015 Secret Wars story, to Battleworld under Doctor Doom’s rule.
But Marvel has not confirmed that the MCU will reproduce that exact sequence.
Whatever happens, a true multiversal collision would have consequences much larger than a single superhero fight.
It could change which characters, worlds and histories survive—and potentially determine what the Marvel universe looks like after Doomsday.
FAQs
1. What is a multiversal collision?
A multiversal collision is a catastrophic interaction between separate universes in which their boundaries break down and their existence becomes threatened. In Marvel Comics, this is closely associated with incursions. During the 2015 Secret Wars storyline, incursions eventually cause the Marvel Universe and Ultimate Universe to collide and be destroyed.
2. Can two universes merge in Marvel?
Marvel Comics can bring elements of different universes together, but that does not mean universes normally merge safely into one reality. In Secret Wars (2015), the final collision between Earth-616 and the Ultimate Universe destroys both realities, with the remnants becoming part of Battleworld.
3. What happens when a Marvel universe dies?
A destroyed universe can mean the loss of its worlds, people and history, although Marvel Comics has shown that some individuals can survive through special technology or other extraordinary means. In Secret Wars, selected heroes survive the final incursion using a life raft before arriving in Battleworld.
4. Can people travel between universes?
Yes. Marvel’s multiverse allows characters and groups to travel between different realities through various technologies, powers and other mechanisms. However, travelling between universes is not the same as evacuating an entire population. The Secret Wars story demonstrates that only a limited group could survive the final incursion through specially constructed life rafts.
5. What is an incursion in Marvel?
An incursion is a catastrophic event in which two universes move toward a collision after their boundaries begin to breach. Marvel’s official Secret Wars guide explains that when the affected dimensions come into contact, both can be destroyed. The concept plays a central role in the events leading to Secret Wars (2015).
6. Will the MCU universes merge?
Marvel has not confirmed that the MCU universes will permanently merge in Avengers: Doomsday. Disney has confirmed that heroes from three distinct universes will be involved in the movie’s existential conflict, but the exact fate of those universes remains unknown.
Conclusion
A collision between Marvel universes could be one of the most destructive events the MCU has ever shown.
The confirmed information is that Avengers: Doomsday will bring heroes from three distinct universes into an existential conflict. The exact mechanism behind that conflict has not yet been revealed.
Marvel Comics, however, provides a clear warning about what an incursion can become. In the 2015 Secret Wars storyline, universes collide and are destroyed, eventually leaving Battleworld as a patchwork reality made from fragments of the multiverse.
That does not prove the MCU will follow the same path. Also read this blog Is Doctor Doom Trying to Save the Multiverse Instead of Destroying It?
But if Avengers: Doomsday adapts even part of that concept, the stakes will be much bigger than saving one planet or defeating one villain. The heroes could be fighting to preserve entire realities and deciding what, and who, can survive when those realities can no longer exist side by side.
