When you look at Avengers Endgame every altered timeline the Avengers create gets repaired except the one where Loki escapes with the Tesseract in 2012. That single branch keeps running.

So what happens in that world? This is how that surviving branch could unfold and how it could turn Tony Stark into Doctor Doom.
1. Loki’s disappearance fractures the timeline
Without Loki being captured and returned to Asgard Thor The Dark World happens differently. Thor has no brother to manipulate or redeem, Odin faces the Aether alone, and Earth stays under cosmic attention much earlier than expected.
2. The Avengers still form but the trust is gone
The Battle of New York still happens but Tony shoulders the trauma alone. Without Loki’s warning about Thanos Tony’s paranoia grows unchecked. That mindset carries into Iron Man 3 where he stops trusting Shield or the government. He isolates himself and his clean slate plan becomes a way to control everything rather than heal from it.
3. The Ultron Project begins early
In Iron Man 3 Happy Hogan says replace the people with robots if you have to. What if Tony actually does it? He develops early Ultron drones as a global peacekeeping force rather than an experiment that fails. These drones are powered by Tesseract based technology left behind when Loki escaped. They resemble the Ultron sentries seen in Doctor Strange in the Multiverse of Madness guarding the Illuminati. In this timeline Ultron is not an accident but part of Tony’s plan.
4. Civil War before Ultron
Because Steve learns that Bucky is alive earlier after Hydra is exposed sooner their ideological conflict begins before Ultron ever exists. Without a common enemy to unite them the Avengers fall apart. Tony focuses completely on control while Steve goes underground.
5. Tony’s evolution into Iron Doom
Cut off from his friends and using Tesseract energy Tony’s view of the world changes. He decides the world cannot be saved only ruled. The suit becomes a symbol of power rather than protection. The blue Tesseract energy merges with his technology and transforms him into the Marvel Universe’s version of Doctor Doom a genius ruler blending cosmic power with machinery.
6. Timeline summary
2012 Loki escapes and the timeline branches.
2013 Iron Man 3 happens and the Ultron project begins.
2013 or 2014 Thor The Dark World occurs without Loki.
2014 The Winter Soldier events happen earlier causing Civil War.
After 2015 Stark’s drones become global enforcers.
End result Tony Stark becomes Doom.

In short every Endgame branch was repaired except Loki’s. That one reality continues without him and its Tony Stark isolated and paranoid transforms into Doctor Doom the man who believes peace can only exist under control.

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