Loki creator Michael Waldron has been brought on to assist with the script for Avengers: Doomsday. Yes, that means the script for the next massive Marvel team up film isn’t done yet, even though principal photography has been underway since April 2025.
He Who Remains (Jonathan Majors) in Marvel Studios’ LOKI, exclusively on Disney+. Photo by Chuck Zlotnick. ©Marvel Studios 2021. All Rights Reserved.
This development, confirmed by Marvel Studios president Kevin Feige, highlights ongoing revisions to the screenplay during production—a practice that has plagued recent MCU projects and doesn’t inspire confidence in the film’s outcome. With echoes of the troubled production of Captain America: Brave New World, which underwent extensive reshoots and rewrites after poor test screenings, fans and industry watchers are questioning whether Marvel is repeating past mistakes on what should be one of its flagship blockbusters.
The Latest on Waldron’s Involvement
Kevin Feige revealed in a recent interview that Stephen McFeely, one half of the writing duo behind Avengers: Endgame, is leading the script for Avengers: Doomsday, but Waldron is now contributing to the effort.
“There’s plus-ing happening every day on set right now, and it is amazing to watch,” the Marvel boss said. “Loki creator Michael Waldron is now also working on it.”
LAS VEGAS, NEVADA – APRIL 11: Kevin Feige, President, Marvel Studios speaks onstage during the Walt Disney Studios presentation at Cinemacon in Las Vegas, Nevada on April 11, 2024. (Photo by Jesse Grant/Getty Images for Disney)
Waldron’s return suggests the current script needed bolstering, even as cameras continue to roll. Not only is the script not done, but the company is bringing new creative voices in three months into principal photography, which isn’t promising.
Waldron, known for his work on Loki Season 1 and Doctor Strange in the Multiverse of Madness, has a mixed track record with Marvel.
Sophia Di Martino as Sylvie in Marvel Studios’ LOKI, Season 2, exclusively on Disney+. Photo courtesy of Marvel Studios. © 2023 MARVEL.
While Loki was initially praised by some for its inventive storytelling (before bait and switching the show to be about a female variant of the main character), Multiverse of Madness drew criticism for uneven pacing and controversial character arcs, particularly for Wanda Maximoff/Scarlet Witch (plus attempting to bait and switch the film to be about a new female character in America Chavez).
michael waldron working on the script for avengers doomsday… oh we’ll never see wanda again.
pic.twitter.com/DymvbZlvS3— scarlet witch gifs (@maximoffgifs) July 20, 2025
Fans on X have expressed concern over his involvement, with one user quipping, “Michael Waldron working on the script for Avengers Doomsday… oh we’ll never see Wanda again.”
like and rt this if michael waldron writing your favs will make you skip avengers doomsday@Kevfeige don’t try us and i know that movie doesn’t have a script so it’s not too late to kick him out https://t.co/gaBSmNl5xn
— Josh🌨️ GIVE US SHIRTLESS CORENSWET🧸 (@celestialdevils) July 21, 2025
Another urged Marvel to reconsider, saying, “like and RT this if Michael Waldron writing your favs will make you skip Avengers: Doomsday.”
Feige’s admission that the script is still evolving on set, a process he described positively, raises red flags given Marvel’s recent history.
Filming Without a Locked Script: A Risky Gamble
Avengers: Doomsday entered production in April 2025 at Pinewood Studios in England, with a sprawling cast including returning MCU veterans and Robert Downey Jr. as the villainous Doctor Doom. Marvel officially announced the start of filming around early April, with reports confirming cameras were rolling by April 2025.
The film is slated for a December 18, 2026 release, following a delay from its original May 2026 slot.
Robert Downey Jr. at the Avengers Doomsday cast reveal – YouTube, IGN
Script revisions during filming aren’t uncommon in Hollywood, but for a high-stakes tentpole like this—expected to kick off the MCU’s Multiverse Saga climax—they can signal deeper issues.
Feige has pushed back against claims that Marvel starts production without a complete script, insisting in the same interview that the studio has “never gone into production without a full script.” However, the ongoing “plus-ing” (industry slang for enhancements and tweaks) and Waldron’s late addition contradict that narrative, suggesting the screenplay wasn’t as ironclad as claimed when filming began.
HOLLYWOOD, CALIFORNIA – JULY 25: Kevin Feige speaks during the ceremony honoring him with a Star on the Hollywood Walk of Fame in Hollywood, California on July 25, 2024 . (Photo by Charley Gallay/Getty Images for Disney)
This approach has proven costly before. Industry insiders have noted that last-minute changes can lead to ballooning budgets, rushed visual effects, and narrative inconsistencies—problems that have dogged the MCU in its post-Endgame era.
Echoes of Captain America: Brave New World
The situation bears striking similarities to Captain America: Brave New World, released in February 2025, which endured multiple rounds of reshoots and script overhauls. Initially filmed in 2023, the movie faced delays after poor test screenings prompted extensive rewrites. Reports indicate at least three rounds of additional photography, with new characters added during reshoots to bolster the plot.
The budget reportedly swelled due to these changes, and actor Tim Blake Nelson (who played The Leader) revealed that much of the original script was reshot.
Harrison Ford as the Red Hulk in Captain America: Brave New World – YouTube, Marvel Entertainment
Critics and fans alike pointed to these production troubles as reasons for the film’s mixed reception, with some calling it a “patchwork” of ideas that didn’t cohere. Screen Rant even detailed 11 scenes altered or added during reshoots, including enhanced action sequences and plot adjustments to integrate better with the broader MCU.
Anthony Mackie behind the scenes of Marvel Studios’ CAPTAIN AMERICA: BRAVE NEW WORLD. Photo by Eli Adé. © 2024 MARVEL.
If Avengers: Doomsday follows suit, it could face similar backlash, especially with a release date looming and expectations sky-high for the Russo Brothers’ return.
Why This Doesn’t Bode Well for Marvel
Marvel’s Phase 5 and 6 have been marred by creative missteps, from Ant-Man and the Wasp: Quantumania’s underwhelming arc to The Marvels’ box office disappointment. Bringing in Waldron mid-production might inject fresh ideas, but it also risks diluting the vision.
Multiple reshoots could mean that the original script isn’t working. It’s entirely possible the studio is trying to plug a hole in broken foundation as production carries on.
LAS VEGAS, NEVADA – APRIL 11: Kevin Feige, President, Marvel Studios speaks onstage during the Walt Disney Studios presentation at Cinemacon in Las Vegas, Nevada on April 11, 2024. (Photo by Jesse Grant/Getty Images for Disney)
With Doomsday set to feature over 60 characters and pivot to Doctor Doom as the big bad, an unstable script foundation could result in a bloated, incoherent mess—much like the complaints leveled at Multiverse of Madness.
Feige’s optimism aside, history suggests these on-the-fly changes often lead to expensive fixes later, potentially eroding fan trust further.
Looking Ahead: Can Marvel Course-Correct?
As filming continues, all eyes are on whether Waldron and McFeely can deliver a cohesive Avengers: Doomsday script in time. The film promises epic stakes, but without a locked narrative early on, it risks becoming another cautionary tale in Marvel’s turbulent recent years. Fans hoping for a return to Endgame-level glory may need to temper expectations—or brace for more reshoots down the line.
SAN DIEGO, CALIFORNIA – JULY 27: (L-R) Louis D’Esposito, Co-President, Marvel Studios, Kevin Feige, President, Marvel Studios, Robert Downey Jr., Joe Russo and Anthony Russo attend the Marvel Studios Panel in Hall H at SDCC in San Diego, California on July 27, 2024. (Photo by Alberto E. Rodriguez/Getty Images for Disney)
For now, the multiverse hangs in the balance, and Marvel’s script drama shows no signs of resolving anytime soon.
How do you feel about Marvel continuing to work on the Avengers: Doomsday script while the movie is filming? Sound off in the comments and let us know!
Michael Waldron is in no position to polish anything. Writers like him are why the MCU is in the state that it’s in.
Yikes, yes, this sounds a lot like a rewrite. I reckon Disney Marvel are writing by committee, and there are tugs of war over the script. This is a BAD SIGN.
This changing the screenplay is akin to changing major requirements, mid-project (the coding phase), in a software engineering project. This ALWAYS ends in balooning budgets, late delivery, and reduced quality. Sometimes the project can even get cancelled. And, no matter what, this is TERRIBLE for morale. Rework is hard, really hard. It is much harder than it sounds. And it is depressing to have to throw away work, and unlearn what was thrown out.