Who Broke The MCU Multiverse: Loki, Doctor Strange Or Miles Morales?

More Marvel movies from several franchises, including Spider-Man: Across the Spider-Verse, are delving into the concept of the multiverse, leading many to question if it was Loki, Miles Morales, or Doctor Strange who broke it in the first place. Since the MCU's Multiverse Saga began, the blurring of franchises has become more common. From the inclusion of variants in the MCU from previously non-canon TV shows like Inhumans to the X-Men and all three live-action Spider-Men crossing over, the multiverse has almost made every Marvel property in history somewhat canon to the MCU.
However, projects like Loki, Spider-Man: No Way Home, and now Spider-Man: Across the Spider-Verse have played with the idea of Marvel characters having direct effects on the multiverse itself. With all three of these Marvel projects exploring some form of multiversal collapse, questions have been furthered about which specific character was responsible for the multiverse's near destruction initially. Between Loki, Doctor Strange, and now Miles Morales by the time the cliffhanger ending of Spider-Man: Across the Spider-Verse rolls around, the multiverse has had many complications since its inclusion to live-action Marvel movies.
Loki & Sylvie Killing He Who Remains Spawned The MCU Multiverse When concerning the question of who broke the multiverse, Loki and Sylvie's role is more akin to creating the multiverse. Loki established that the multiverse has always existed, but the TVA was in place in order to protect its reality. He Who Remains, a more benevolent version of Kang the Conqueror, established the TVA as a way to stop multiverses from colliding. Whenever anyone from across the multiverse strayed from the path of the Sacred Timeline, potentially crossing over with another timeline and colliding universes together, the TVA would step in, prune the branching timeline and restore order.
However, Loki's season 1 finale saw Sylvie kill He Who Remains as revenge for her own timeline being pruned. As a result, the TVA's operation collapsed and allowed the crossing over of timelines to begin. After the death of He Who Remains, the multiverse began infinitely expanding from all points in time almost instantaneously, meaning it was almost as if the multiverse had existed since the beginning of time. Loki, but more accurately Sylvie, was responsible for this, meaning the show did not depict a crack in the multiverse, but more an origin story for the concept.
Doctor Strange & Spider-Man Created Problems For The MCU Multiverse One of the next projects to directly involve the multiverse was Spider-Man: No Way Home, which was even referenced in a Spider-Man: Across the Spider-Verse Easter egg. The film saw Doctor Strange aiding Spider-Man with a spell that would cause everyone to forget Peter Parker's identity as the web-slinger. While the spell had been done before, the events of Loki meant that the spell now transcended multiple universes. Peter's meddling with Strange's spell made it so that every person from across the multiverse that knew Peter Parker's secret identity was pulled to the MCU.
Naturally, this created problems for the fabric of reality. Not only did it have huge ramifications for Peter himself, but the multiverse would have shattered if not for Strange's final spell in which everyone forgot this version of Peter Parker existed. Without the TVA to fix the issues that Spider-Man and Doctor Strange created, the multiverse began infecting the MCU. This was somewhat fixed, meaning Doctor Strange and Spider-Man were not responsible for breaking the multiverse, only causing some catastrophic problems that leaked into Doctor Strange in the Multiverse of Madness.
Miles Morales Is The Original Anomaly Of The MCU Multiverse Interestingly though, Spider-Man: Across the Spider-Verse directly tied Miles' origin to the multiverse. The Spider-Society in the film run by Miguel O'Hara/Spider-Man 2099, acts almost as its own TVA, only for Spider-Man-specific events across the multiverse. The Spider-Society is responsible for protecting the universes that include Spider-Man - or a variant of him - from anomalies that could destroy the universes in question. When Miles attempts to join the Spider-Society, he is told that he is an anomaly himself.
The radioactive spider that bit Miles during Spider-Man: Into the Spider-Verse was revealed as being from a different universe. This meant that the universe from which the spider came, Earth-42, did not have a Spider-Man and devolved into chaos. Miles' origin meant that Peter Parker of his universe died, with Miles' entire existence meaning he is an anomaly in almost every universe. This caused big problems in Spider-Man: Across the Spider-Verse, with Miles interfering with canon events - instances that happen to every Spider-Man in every universe - and failing to accept this as a reality.
While it is unclear exactly how Miles' actions will interfere with the multiverse, his status as an anomaly means he is partly responsible for the fragile state of the multiverse that began with Loki and Spider-Man: No Way Home. Similarly, Miles' existence as Spider-Man created the Spot, whose quest for power could threaten the entire multiverse itself. Because Miles became Spider-Man, the Spot was also created which pitted Miles against the Spider-Society in Spider-Man: Across the Spider-Verse. While neither Loki, Doctor Strange, nor Miles are responsible for specifically breaking the multiverse, they all have directly contributed to its volatile state in the wider Marvel universe.


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