The MCU Multiverse Explained
Updated
The MCU multiverse is an endless set of branching timelines, once kept to a single line by the TVA and now threatened by universes colliding. Here are the rules as the films and shows have set them up, with any guesswork clearly marked.
Rule 1: The Sacred Timeline (and its end)
Loki Season 1 introduces the "Sacred Timeline": a single allowed history, enforced by the TVA pruning every branch. By the end of the season that system breaks, and the timeline splits into infinite branches. The multiverse wasn't created in that moment; it was unleashed.
Spoiler Spoilers for Loki Season 1: tap to reveal
The Sacred Timeline turns out to be He Who Remains' prison, built to stop his own variants from rising again. When Sylvie kills him, the timeline shatters.
Rule 2: Variants: every choice makes a you
A variant is a version of a person from a branched timeline. Loki meets dozens of his own (one of them an alligator), and in Spider-Man: No Way Home Doctor Strange's botched spell cracks the barriers between universes. Variants can look identical or wildly different; what matters is the branching event that made them diverge.
Spoiler Spoilers for Spider-Man: No Way Home: tap to reveal
No Way Home brings three Peter Parkers together: Tom Holland's, Tobey Maguire's and Andrew Garfield's.
Rule 3: Incursions: when universes collide
An incursion is the catastrophic collision of two universes, destroying one or both. Doctor Strange in the Multiverse of Madness is where the MCU spells it out. In the comics, incursions were the fuse for 2015's Secret Wars, which is why the concept is central to where the saga is heading (see our Secret Wars explainer).
Spoiler Spoilers for Doctor Strange in the Multiverse of Madness: tap to reveal
The explanation comes from Reed Richards of Earth-838 (John Krasinski), and the mid-credits scene reveals that Strange has caused an incursion himself.
Rule 4: Branching, and Yggdrasil
Loki Season 2's finale rewrote the cosmology. The branches are no longer pruned; they grow into a living tree of timelines, Yggdrasil, and the TVA's new mission is protecting them. The multiverse is no longer a weapon to be controlled; it's a garden to be tended.
Spoiler Spoilers for Loki Season 2: tap to reveal
Loki refuses to prune the branches and instead holds them together himself as the God of Stories, weaving the timelines into Yggdrasil.
Rule 5: The Void and anchor beings
Deadpool & Wolverine leaned on two concepts: the Void, the wasteland at the End of Time where the TVA dumps pruned variants (first seen in Loki Season 1), and anchor beings, individuals so load-bearing that their death causes their universe to decay. Our guess, not a confirmed plot point: these are the mechanics Doctor Doom's story is most likely to exploit in Avengers: Doomsday. For the full viewing path, see what to watch before Doomsday.
How the rules fit together
Put simply: the TVA once kept a single timeline, the two Loki finales changed that for good, incursions threaten to smash the branches into each other, and the TVA polices the wreckage. Every Multiverse Saga story builds on those ideas. Get them straight now and Doomsday and Secret Wars should make sense when they arrive. Start with chronological order, or go deeper with our TVA explainer.
Spoiler Spoilers for Loki Seasons 1 and 2: tap to reveal
The one-line version: He Who Remains pruned the branches; Sylvie unleashed them; Loki now holds them together as Yggdrasil; incursions threaten to smash them into each other; and the TVA polices the wreckage.
FAQ
What is a variant in the MCU?
A version of a person from a branched timeline, like the many Lokis that Loki meets in Loki Season 1.
What is an incursion?
The collision of two universes, destroying one or both. Introduced in Multiverse of Madness, it’s the central threat concept behind Secret Wars.
What is Yggdrasil in the MCU?
The living tree of timelines at the heart of the Loki Season 2 finale. How it forms is that finale’s big moment, so it’s in the reveal box above.
Do I need to understand the multiverse before Doomsday?
Yes. Watch Loki Seasons 1–2, No Way Home, Multiverse of Madness, and Deadpool & Wolverine. They’re the saga’s rulebook.