For months, Marvel Studios has dropped subtle hints regarding how Avengers: Endgame ties into its highly anticipated follow-up, though the bulk of that conversation has been fueled by promotional trailers and internet leaks rather than official word from the filmmakers themselves. 

As the franchise barrels toward its next massive crossover event, passionate fans have scrutinized every second of footage and sifted through insider chatter to figure out how these sprawling storylines will connect past victories with upcoming dangers. This atmosphere of heightened excitement has turned even the smallest cinematic Easter egg into major fodder for the community. 

But now, Anthony Russo has pulled back an important layer on the grand plan, giving audiences a much sharper look at how exactly Endgame gave birth to Avengers: Doomsday.

During a Q&A session following a New York screening of Avengers: Endgame Encore, Anthony Russo was questioned about specific moments in the movie intended to take on new weight now that Avengers: Doomsday is on the horizon. Unsurprisingly, Russo highlighted the re-release's major concluding twist. 

"We play one beat past where Steve Rogers' story ended with Peggy Carter, and in that moment, that's where Doomsday is born," Anthony Russo told the crowd.

Although Russo kept his comments brief, the implication is that whatever transpires between Steve, Peggy, and Loki ultimately triggers the emergence of Doctor Doom - prompting no shortage of fan theories. A recent teaser showed Doom grieving his wife and child, leading viewers to speculate that the timeline interference by Steve and his companions inadvertently places Doom on a vengeful path.

Moreover, this new ending abruptly shatters Steve Rogers and Peggy Carter's idyllic happy ending with an unexpected visit from Loki. As fans attending early screenings discovered, Steve and Peggy's romantic dance is cut short when the God of Mischief drops in - apparently operating in his capacity as a TVA agent.

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While the fans have some much-needed context on how Avengers: Endgame Encore bridges Avengers: Doomsday to the current timeline, the specifics still intrigue them to a great extent.  

Many crucial details remain under wraps, including Loki's exact motivation for visiting Steve and the ultimate fate of the former Captain America. Some fans suggest that Loki is actually rescuing Steve and Peggy from a reality on the brink of collapse, inadvertently relocating them to Doctor Doom's universe instead. Alternative theories propose that the couple's decision to have a child in a foreign reality disrupts the cosmic balance, resulting in the loss of another child to right the scales of the multiverse.

By confirming that Steve and Peggy's story arc directly sparks the central conflict in Avengers: Doomsday, Anthony Russo has handed fans a vital new piece to puzzle over as the premiere approaches. The specifics of Loki's unexpected visit and the consequences it holds for Steve's family are still tightly under wraps, but Marvel's intentions are unmistakable: this pivotal crossover moment serves as the foundational spark for the sprawling multiversal crisis landing on the big screen this December.

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How exactly do you think Steve Rogers is responsible for the Doomsday storyline? Do let us know.