Disclaimer: The following theories emerge from conjecture in the MCU universe. It hasn’t been substantiated with facts and verified by the officials. These are speculations. Purely. ( via spiderman6165.blogspot.com)
The leak claims that Kang is not the real cause of the multiversal disintegration. Kang, the Conqueror, is known as the master of time travel. He can create countless branch timelines and launch a significant incursion. As implied in Ant-Man and the Wasp: Quantumania, he has slain Avengers and destroyed several Earths. But it’s Steve Rogers.
Rogers unintentionally started a series of intrusions across worlds when he travelled back in time at the end of Endgame and decided to remain there. Each modified timeline collided with the others.
This, in turn, caused Robert Downey Jr’s Doctor Doom’s universe to collapse. He originates from a 31st-century timeline in which he was the reigning monarch of Latveria. Sue Von Doom was his wife, with Franline and Valeria their children. Unfortunately, he was already aware of the multiverse. He loses everything. It would function as his villain-origin tragic backstory.
He isn’t a shoddy villain, but a product of space liminality and universal catastrophe. According to reports, the film begins from the perspective of Tobey Maguire’s Spider-Man universe. At the last moment, a portal opens as reality collapses and the sky rips apart—bringing Spider-Man from Tobey Maguire into the multiverse.
He uses pure hatred and horror to control the character. He murders the Council of Doom. He manipulates heroes by leveraging his resemblance to Tony Stark and uses Franklin Richards to revive Wanda Maximoff. Wanda was promised her children on Battleworld. Armies do not defeat this Doom. With hope, he triumphs. There are just three Earths left in the vicinity: Earth-616 (MCU), Earth-828, and Earth-10005. (Fox Universe)
Doom attacks the X-Mansion with Doombots and portrays the MCU as the aggressor. He promises Magneto a mutant nation (Krakoa) on Battleworld and dangerously earns Professor X’s trust.
This results in:
X-Men against. Avengers
Professor X defeats Sentry.
Doom stealing Cerebro
Franklin teleported him away.
The overarching theme of loss runs rampant. Doom attacks and destroys the Time Variance Authority, slaughtering everyone within, while Loki departs to talk with Steve Rogers. The younger versions of Professor X and Magneto from the X-Men movies, Deadpool, Wolverine, Gambit, X-23, Tobey and Andrew’s Spider-Men, and many other multiversal heroes are then vanquished by him.
Doctor Strange betrays everyone, shocking, right? He changes sides when he has no other choice. Not out of malice but due to necessity. This crazy fan theory exploded when the user speculated that Doom forged the existence of Tony Stark.
Doom created the Sacred Timeline. The Starks adopted MCU Victor Von Doom. He was given the name Tony Stark. This timeline was made possible by Doom until Steve broke it. In layman’s terms, Doom made it possible for Tony Stark to exist.
