Marvel Studios’ Avengers: Doomsday has taken an unusual path toward the big screen. The highly anticipated Marvel Cinematic Universe crossover began filming before its screenplay was fully finished, a revelation that has sparked plenty of discussion among fans.
Rather than treating the unfinished script as a sign that the production lacked direction, however, directors Joe and Anthony Russo have explained that the approach was connected to the way they prefer to make movies. Joe Russo recently described their screenplay as a “living organism,” emphasizing that the brothers like to develop scenes through rehearsals and collaboration with the actors.
Why Did Avengers: Doomsday Start Filming Without a Finished Script?
The situation surrounding Avengers: Doomsday is closely connected to the movie’s complicated development history.
The project was originally announced as Avengers: The Kang Dynasty, with Kang the Conqueror expected to remain a major part of Marvel’s next Avengers storyline. After Jonathan Majors was dropped from the MCU, Marvel had to rethink the direction of the film.
The project eventually evolved into Avengers: Doomsday, with the Russo Brothers returning as directors and Robert Downey Jr. taking on the role of Doctor Doom. That major creative change meant the story had to be significantly reworked before production moved forward.
According to Joe Russo, the filmmaking team was comfortable continuing to develop the screenplay while production was underway. The directors have said that they are improvisation-based and rehearsal-based filmmakers, meaning they like to see what performers bring to their characters before completely locking every aspect of a scene.
The Russo Brothers’ Unusual Filmmaking Approach
For a movie as large as Avengers: Doomsday, filming without a finalized screenplay may sound surprising. The film brings together characters and teams from across the MCU, making it one of Marvel’s most ambitious crossover projects.
But the Russo Brothers have experience working with large ensemble casts. Their previous Marvel films, Avengers: Infinity War and Avengers: Endgame, required them to balance numerous characters and storylines while maintaining a single overarching narrative.
Joe Russo has argued that a script can continue to evolve during production. From his perspective, rehearsals can reveal new possibilities that may not have been obvious when the screenplay was first written.
That means scenes can change based on an actor’s performance, the chemistry between performers, or discoveries made during rehearsal.
For the filmmakers, this process can create opportunities that a completely locked screenplay might not provide.
Sebastian Stan Also Spoke About the Production
The unusual production process has also been discussed by members of the cast.
Sebastian Stan, who returns as Bucky Barnes, previously indicated that the cast was not necessarily working from a traditional complete screenplay during production. He described the process as involving scattered scenes and continuous changes.
His comments helped fuel fan speculation about how much of the story was actually finalized while cameras were rolling.
However, it is important to distinguish between an unfinished script and having no story at all.
A major Hollywood production can have a detailed overall plan, character arcs, story beats, production designs and individual scenes while the screenplay continues to receive revisions.
In other words, the fact that the script was not completely locked does not automatically mean that the filmmakers were improvising the entire movie from scratch.
A Massive MCU Story
One of the biggest challenges facing Avengers: Doomsday is the sheer number of characters involved.
The movie is expected to bring together major MCU heroes and teams, including the Avengers, the Fantastic Four, the New Avengers and returning X-Men characters. Robert Downey Jr.’s Doctor Doom is also positioned as a central figure in the story.
The scale of the project makes the filmmaking process considerably more complicated than that of a conventional superhero movie.
Every major character needs to have a purpose, while the overall story must remain understandable for audiences. At the same time, Marvel has to balance returning characters with new developments that can lead into the wider MCU storyline.
The Russo Brothers’ decision to keep the screenplay flexible could therefore be an attempt to make sure the huge ensemble works effectively on screen.
Does an Unfinished Script Mean the Movie Is in Trouble?
Not necessarily.
The headline that Avengers: Doomsday was filmed before the script was fully finished sounds alarming, but the directors themselves have presented the process differently.
Joe Russo’s explanation suggests that revisions were part of the creative process rather than evidence that the production had completely lost control of its story. He has emphasized the importance of rehearsal and allowing actors to influence their performances before scenes are finalized.
At the same time, there have been reports and speculation about challenges during post-production. Some reports have claimed that the enormous amount of material created during filming has made the editing process particularly demanding. Those reports should be treated cautiously, however, because not every claim about the production has been independently confirmed.
Ultimately, audiences will not know whether the unconventional approach worked until they see the finished movie.
Marvel Has Used a Flexible Production Process Before
Marvel Studios has a history of making changes during production and post-production. Scripts can evolve, scenes can be rewritten, and additional photography can be used to refine a movie.
That does not make the Doomsday situation completely ordinary, though.
The scale of this particular project makes the decision more noteworthy. A small character-driven movie can potentially adapt more easily to changes during filming. An Avengers movie featuring dozens of major characters is a much more complicated puzzle.
Every alteration can affect other scenes, visual effects, character continuity and the overall story.
That is why fans are paying such close attention to reports about the film’s production.
What Fans Should Expect From Avengers: Doomsday
Despite the unusual production process, expectations for Avengers: Doomsday remain extremely high.
The return of Joe and Anthony Russo is particularly significant. The directors previously guided Infinity War and Endgame, two of the MCU’s biggest crossover films.
The movie also represents Robert Downey Jr.’s return to the MCU in a completely different role. Instead of playing Tony Stark/Iron Man, Downey is portraying Doctor Doom, giving the film another major point of interest.
With the Fantastic Four, Avengers-related characters and X-Men figures involved, Doomsday is shaping up to be one of Marvel’s largest cinematic events.
Final Thoughts
The revelation that ‘Avengers: Doomsday’ was filmed before the script was fully finished certainly makes the movie’s production more unusual. However, the Russo Brothers insist that the process was intentional and connected to their collaborative style of filmmaking.
For them, the screenplay is not necessarily a document that must remain completely unchanged from the first day of production. Instead, they see it as something that can evolve through rehearsals, performances and discoveries on set.
Whether that philosophy produces a better Avengers movie remains the biggest question.
With the film scheduled for release on December 18, 2026, fans will eventually get the chance to judge the results for themselves. Until then, the unfinished-script revelation adds another intriguing chapter to the already complicated story behind Avengers: Doomsday.
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