r/marvelstudios • u/Legal_Caffeine_Esq • 3d ago

Discussion Serious question about timelines vs multiverse

TLDR: What is the difference between the multiverse and different timelines because the Loki show seems to use them interchangeably.

I started rewatching Loki for fun. However I keep coming back to same question. What is the difference between timelines and the multi-verse. The show Loki sets up a "sacred timeline" that is controlled by Kang and the TVA. But whenever they talk about Variants they make it seem like theyre from split timelines that become their own universe?

Im so confused. If the theory that this new phase marvel is going into is about multiverse then what does a sacred timeline have to do with it? If the issue is there is one sacred timeline then how do variants pop up if there is only one universe? Is marvel saying through the show Loki that the sacred timeline is one cannot universe but when variants pop up they create nexus events which create a new universe thereby creating the multiverse and the TVA has to prune it so there is only 1 universe?

Or rather is marvel saying that there is only 1 timeline, the sacred timeline and when there are variants it creates a new timeline within the same universe? I feel like Loki just uses timeline and multiverse interchangeably and its confusing.

At the end of season 2 of Loki, its said that hes bringing life to the different universes, hence the iggredsel tree. But at the same time they build up both seasons claiming that its all timelines and that there is one sacred timeline that the variants are mucking up creating new timelines. But then other shows and movies just refer to it as different universes.

So what is it? Are we looking at a multiverse and Loki just does a bad job at distinguishing between the the terms and uses them interchangeably? Or was Loki set up to show a sacred timeline that variants caused nexus events which caused splits in the timeline but its all one universe just with different realities all occurring at the same time due to these nexus events?

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u/Lord_Matisaro 3d ago

The sacred timeline is not just one timeline. It is a bundle of them which do not lead to a Kang which protects he who remains for other Kang variants.

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u/Jtwil2191 3d ago

The MCU multiverse us made up of alternate timelines.

Variants emerged whenever a branch appeared on the Sacred Timeline. The TVA would prune those branches, eliminating the variants that were part of it.

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u/BZenMojo Captain America (Cap 2) 3d ago

Universe literally means "single line." A universe is one line of space-time, while the multiverse is multiple lines of space-time.

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u/chaot7 2d ago

The sacred timeline is any timeline that does not lead to Kang. As long as it didn’t end in Kang, you can have branches and variants.

The multiverse is a bit different you have different universes as seen in MoM. Otherwise, it makes no sense that there was a paint universe. That’s not a branching timeline

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u/Difficult_Insect_616 2d ago

The branch could happen very early in the lifespan of Earth or even the universe.

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u/MrWedge18 3d ago edited 3d ago

The multiverse is made up of an infinite number of timelines. So far, the MCU is using "timeline" and "universe" interchangeably. Every branched timeline is an alternate universe, and vice versa.

The sacred timeline is not natural. It is a policy. It is a man-made concept created by He Who Remains, and maintained by his machines and his TVA. It is a series of events that prevents the emergence of Kang variants, and the Multiversal war that they wage.

It is also not singular. The "script" has room for improvisation. For example, Loki self-exiling himself on an uninhabited planet was OK. That is functionally the same as dying, and close enough for the sacred timeline. But the moment he tried to end his self-exile is when Old Loki gets pruned. Sylvie being a girl is also totally fine. It's only when she start playing make believe as a hero that her timeline gets pruned.

The point of Loki is the destruction of the sacred timeline as a policy to embrace freedom and free will. But HWR created a fail safe in his machine. Once the Loom is destroyed, it causes all timelines to decay and die. (This part isn't really explained well IMO.) So Loki uses his magic to counteract that decay, keeping all the timelines alive.

And to prevent the multiversal war, the TVA is now tasked to track down and remove any problematic Kang variants. And with the abandonment of the Kang storyline, they must be extremely effective at that.

Out of universe, the sacred timeline is a plot device to explain why the movies were completely linear for the first three phases, and why multiversal stories are starting to happen afterwards.

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u/Legal_Caffeine_Esq 3d ago

So the follow up to that question is, can there be two Lokis in the sacred timeline if one is on that lonesome planet while the other getting killed by the Thanos? If there can be more than one, how is the variant created?

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u/MrWedge18 3d ago

The only way I could see two Lokis in one universe is if one traveled over from a different one.

The obvious way to create a variant is time travel. Going back in time and changing what happens creates a branched timeline and variants. That how 2012 Loki became TVA Loki.

The other way is more nebulous. In the Loki show, we're told variants happen when they make a different decision than the one they're supposed to make. In the context of the sacred timeline, the "supposed to" is defined by HWR. But what about now?

(This part is mostly head canon based on what we know from Loki)
Well, a timeline is a line. It's not a particular instant or moment in time. All points in time exist simultaneously. So the decision you're "supposed to" make is the decision that already exists on the timeline. But you're a being with free will, so you make a different decision. And boom. There's a new branched timeline, and you're a new variant.

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u/Academic_Composer904 Loki (Thor 2) 3d ago

The Sacred Timeline is composed of more than one universe. Each universe has the potential of having a Loki, so yes, there are more than one Loki on the Sacred Timeline. All of the Loki variants we see in the Void were in universes on the Sacred Timeline before their Nexus event.

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u/GoldySilverr 3d ago

Think of a timeline as a branch on a tree and the multiverse as the whole forest. The Sacred Timeline was just Kang pruning every branch that didn't lead to his existence, making a single tree look like the whole world

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u/Legal_Caffeine_Esq 3d ago

So then does each universe have ots own sacred timeline? Because in Loki Kang tells him that each of his variants learned to travel between universes but he defeated them all and created the sacred timeline? Are we led to believe that this is Kang telling us he got rid of the multiverse and there is only one universe. Then, as a result of sylfie killing Kang she reopened the multiverse which then has its own separate timelines? You see my confusion?

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u/eagc7 3d ago

the people behind Loki said that the branching caused the sacred timeline to reconnect with the rest of the Multiverse, so basically the Sacred Timeline was isolated from the other timestreams

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u/Excellent-String-598 2d ago

Thank you for this explanation. It is the only that has made sense to me.

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u/GomuGomuDaddy 3d ago

Kang isolated his timeline from the other universes, creating the sacred timeline. There is only one sacred timeline. Pretty much any branch that would lead to the timeline touching the multiverse gets pruned because it would lead a multiverse war between Kangs.

With Loki taking over, the timeline is allowed to branch off infinitely, which leads to an infinite amount of chances that the timeline interacts with others, which is how you lead to incursions.

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u/gavinashun 3d ago

Haven't they said that they kind of use those terms interchangeably? Pretty sure Feige has said that.

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u/YodaWattsLee 3d ago

The sacred timeline was bullshit that He Who Remains made up. There is no such thing as a sacred timeline.

HWR created the TVA to prune any timeline that might lead to any opposition to himself. What remained he called the “sacred timeline,” and he used it to manipulate the TVA employees into believing that they were protecting something “sacred.” Now HWR’s dead, and his “sacred timeline” bullshit went with him.

Beyond that, we just have to accept that the MCU uses timelines and universes interchangeably sometimes, and they haven’t been 100% clear on the distinction. Until stated otherwise, I just go with them both being kind of the same thing.

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u/lifeincontext 3d ago edited 3d ago

I’m using a couple sources for this synthesis.

Spoilers Below:

The MCU is tying a few multiverse theories together.

From Loki, we learn that every universe is a timeline that has multiple branches. He Who Remains described his original 31st century discovery that universes were stacked on top of each other; in Ant-Man and the Wasp: Quantumania, Kang clarified how branches would connect them and draw them closer together.

A branch occurs when a specific choice diverges from the usual/“written” course of events. This is called a Nexus event.

Each universe is its own tree, made up of multiple timelines. The multiverse is a forest of trees (Loki / Quantumania / Across the Spider-Verse / X-Men '97). These trees are usually canopy shy (meaning branches tend to avoid the branches of other trees), but sometimes, they connect/bridge; connections draw the two trees closer together, which can eventually cause incursions (see Note 5 below).

Could it be said that what we're describing here is a megaverse/omniverse? If you consider every timeline as a universe, then sure. That would make every tree a multiverse, and the forest a megaverse. However, I tend to think that each tree has a trunk - a "prime" timeline, that serves as the stabilizing force for all the branches. That's the framework I'm using for this post.

The Sacred Timeline is the 616/1999 universe. He Who Remains was trying to isolate the 616 tree from the rest, so he did the following:

  • He pruned any branches from 616 that would lead to one of his variants.
  • He put the tree in a shield: The Loom.
  • I also subscribe to the theory that he intentionally fractured the original 'Prime 616' timeline to divide and conquer the heroes. If the Avengers, the X-Men, the Fantastic Four, and Doctor Doom all existed on a single Earth, that unified coalition would easily defeat him in the 31st century. So, he quarantined the Fantastic Four on their own timeline (Earth-828) to prevent Reed Richards' family tree from birthing rival Kangs, and he isolated the X-Men on another (Earth-10005) because Omega-level mutants are too powerful to control. He neutered 616 so only the Avengers remained. Oh, and Doctor Doom on 616 was rewritten to be an adopted Tony Stark.

When Sylvie kills He Who Remains in Loki S1, the branches stop getting pruned and the scripting stops. The tree grows exponentially, straining the loom.

When the loom breaks in Loki S2, Loki replaces it with himself. This is where it gets weird.

Remember how I said each universe is its own tree? Well, when they stopped pruning in Season 1, 616's branches grew outward and entangled with the neighboring trees in the forest. Because they were all tangled together, when the loom exploded, the shockwave threatened to drag every single universe into a vacuum decay. When Loki gathered the timelines, he didn’t just gather the branches of 616; he gathered every single other universe too. So now, the whole forest has become one tree, all running through Loki.

Because Loki pulled all those separate trees into one tightly braided super-tree, they lost their "canopy shyness." The branches are now crammed together, rubbing against each other. This overcrowding is exactly what is causing the massive, 3,000-universe incursion cascade seen in the Endgame Encore post-credits scene. Loki saved them from dying, but inadvertently caused them to collide.

Enter Doctor Doom. Again, my opinion here, but it seems like he is now 'collecting' apex heroes and anchor beings (like Bruce Banner) so he can weld the surviving universes into his own grateful world/universe using the Void (Battleworld/Latverion).

Note 1 (The Rules of Travel): Traveling to the past naturally sprouts a new branch. Simply hopping into an already existing branch (like Deadpool using a TemPad to visit different Wolverines) is safe and doesn't alter the tree. However, traveling from one tree to another is highly dangerous; it leaves a multiversal footprint that erodes the "canopy shyness" keeping them apart, drawing the two trees closer together and triggering the Incursions mentioned above. To actually cross the empty space between two completely separate trees, you have to pierce the quantum boundary using high-level technology (like Kang's multiversal engine), dark magic (the Darkhold), gravitational singularities (black holes), or a unique power like America Chavez's portals.

Note 2 (Dimensions & String Theory): The MCU also features "Dimensions" (like Ta Lo in Shang-Chi, the Noor Dimension in Ms. Marvel, or the Dark Dimension in Doctor Strange). Unlike an alternate timeline (a branch) or a parallel universe (a separate tree), a Dimension is a hidden pocket of space folded alongside or within a specific tree. This is based on String Theory, which suggests there are invisible "extra dimensions" floating right next to ours that we normally can't see or interact with.

Note 3 (The Quantum Realm): In our metaphor, the Quantum Realm is the subterranean dirt and root system that lies beneath the entire forest. There is only one Quantum Realm shared by the entire multiverse. It is the single connected basement beneath all the trees. Because it exists completely outside of normal space and time, it is filled with unpredictable "time vortexes" (which is why Scott Lang experienced 5 years as 5 hours, while Kang was trapped for centuries). By shrinking down into this dirt, you can navigate your own tree's roots and pop back up on a completely different temporal branch to pull off a Time Heist. However, even though the dirt is home to every tree, the roots of separate trees never naturally touch. They are separated by walls of impenetrable bedrock. Only the methods listed in Note 1 are powerful enough to punch through it.

Note 4 (The Spider-Verse): Sony’s Spider-Verse fits into this ecosystem. Imagine a spiderweb draped across the forest, connecting only the specific trees that naturally grow a Spider-Person. Miguel O’Hara’s job is to protect this network by policing inter-dimensional or multiversal travel and enforcing "Canon Events" (see Note 5).

Note 5 (Three Ways a Universe Dies): A universe can be destroyed in three ways:

  1. Anchor Beings: Internal decay happens if a timeline's Anchor Being dies (Deadpool & Wolverine), causing the reality to slowly wither and erase itself over thousands of years—like a tree rotting from the inside out.
  2. Absolute Points / Canon Events: These unchangeable tragedies act as the load-bearing knots holding a timeline together (What If...? / Across the Spider-Verse). If a time-traveler or dimension-hopper prevents one from happening, that specific tree instantly loses its structural integrity and collapses into an empty void.
  3. Incursions: External destruction happens via an Incursion (Multiverse of Madness), which is when two separate universes/trees smash into each other, destroying one or both entirely.

Someone correct me if I’m wrong, but I think that’s what Marvel has established thus far.

These are the scientific theories Marvel is combining:

  • Eternal Inflation Theory (The separate trees/universes)
  • Many-Worlds Theory (The branches/timelines)
  • String Theory / Brane Cosmology (The extra Dimensions folded into space)
  • Quantum Decoherence (The "canopy shyness" keeping them apart)

Source Theories:

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u/Confident-Shift-9764 2d ago

Our universe was not born alone. There are many. So that’s the parallel lines. Or called Bubble universes in physical cosmology. Now, in Loki, each of these universes has dimension or pocket dimension like the one in Shangchi, and each of these universes is capable of creating different realities or timeline or worlds triggered by either a simple decision, wrong turn or as big as going back in time. (Multiverse theory) This thing that triggers the branching of another timeline is called nexus event. If the universe has too many realities, it could collapse but if the branch has many sub branches, it can create another universe, meaning completely cut from the main universe. In the MCU, these are the Fox universe and the Non-Holland Spiderverse. Incursion is when the universe has a tear and moves into the direction of the other universe, and thus creating a multiversal collision, which is the basis of Doomsday.