Avengers: Endgame Is Getting a Doomsday Retcon — And It Changes Everything

When Marvel announced that Avengers: Endgame would return to theaters in September 2026, most fans assumed it was a standard re-release — maybe a few deleted scenes, a new post-credits tag, and a nostalgia-fueled victory lap for the highest-grossing film of all time. They were wrong.

At the Sands Film Festival in St. Andrews, Scotland, director Joe Russo dropped a revelation that changes everything we thought we knew about the MCU timeline.

"Footage Set in the Doomsday Story"

"It's critically important to re-release the movie," Russo told the audience, "and, in fact, we'll be re-releasing the film with footage that is set in the Doomsday story that we have added to Avengers: Endgame."

Read that again. This is not a deleted scene from the original 2019 production. This is new footage — filmed as part of Avengers: Doomsday — that is being retroactively inserted into Endgame. It is a retcon in the truest sense of the word, comparable to the Star Wars Special Editions that added Hayden Christensen as ghost Anakin at the end of Return of the Jedi. The original version existed for decades, but the new version smoothed the transition to the prequel trilogy.

Marvel is doing the same thing here, except the stakes are even higher.

What Could the New Footage Show?

The biggest question hanging over Avengers: Doomsday is simple: how is Steve Rogers back? Chris Evans' Captain America got his fairy-tale ending in Endgame, traveling back in time to live out his life with Peggy Carter. He appeared as an old man on a park bench, passing the shield to Sam Wilson. That was supposed to be the end.

But Evans is confirmed to return in Doomsday — not as old Steve, but as a bearded, long-haired version of Rogers in a black shirt, as revealed in the CinemaCon trailer. Something happened between that park bench scene and Doomsday, and the new Endgame footage is almost certainly going to show us what.

Possibilities include a post-credits scene showing Doom's influence reaching across timelines, a hidden moment during the Time Heist that was not originally shown, or even a scene where Steve Rogers encounters a multiversal anomaly during his time-travel journey. Whatever it is, Russo called it "critically important" to the Doomsday story — this is not optional viewing.

The Star Wars Precedent

Marvel is borrowing a page from Lucasfilm's playbook, and it is a smart move. The Star Wars Special Editions were controversial, but they accomplished their goal: they brought audiences back to theaters and created a bridge between the original trilogy and the prequels. Marvel's version is arguably less controversial because they are adding to the story rather than changing existing scenes.

The re-release is scheduled for September 25, 2026, giving fans nearly three months to process the new footage before Doomsday arrives on December 18. Disney is also using the re-release to debut its new Infinity: Vision premium large-format certification program, which will identify theaters that meet IMAX-level quality standards — a direct response to the IMAX scheduling conflict with Dune: Part Three.

The Box Office Play

Endgame is already the highest-grossing film of all time, and this re-release will only extend that lead. But the real play is not about box office numbers — it is about priming the audience. Marvel wants every single person who watches Doomsday in December to have seen the new Endgame footage first. It is the ultimate "previously on" for a franchise that spans 30+ films.

The four Doomsday teasers released alongside Avatar: Fire and Ash already generated over one billion combined views. Adding a theatrical event three months before release is marketing genius.

Collector's Corner

Endgame-era cards are about to experience a renaissance. When the re-release hits theaters in September, expect a massive spike in demand for anything connected to the original Endgame roster — especially Steve Rogers.

Hot Cards to Watch:

• Captain America Topps Chrome Marvel base + parallels — Chris Evans' return makes every Cap card relevant again
• Endgame-themed insert sets — Any card depicting the Time Heist, final battle, or "I am Iron Man" moment
• Doctor Doom first appearance cards — Fantastic Four #5 (1962) reprints and modern homages
• Infinity Gauntlet cards — The Gauntlet is central to the retcon; expect renewed interest

Track real-time price movements on Card Ladder — their Marvel index has been climbing steadily since CinemaCon, and the Endgame re-release announcement should push it even higher.

Avengers: Endgame returns to theaters September 25, 2026. Avengers: Doomsday opens December 18, 2026.