A new wave of speculation has emerged around Avengers: Doomsday. It suggests that a young rising star may have quietly joined the cast of the upcoming MCU film.
Interestingly, the report comes from information spotted by Prime Top News on X. It claims that actress Matilda Firth may have previously had an MCU listing connected to the project. However, this detail has not been verified. Still, it has generated significant discussion among fans who closely follow every MCU casting update.
Moreover, Marvel Studios is known for keeping major roles secret until official announcements. Because of this, even small leaks often lead to widespread theories. They also trigger heavy discussion and analysis across social media platforms.
However, Marvel Studios has not officially confirmed any involvement, so the details remain unverified.
“Little Girl” Role Listing Fuels Mystery
According to the circulating reports, Matilda Firth’s resume once included a mysterious role described as:
“Little Girl”
Her agency at The Artists Partnership later removed this listing from her profile, and this change has only intensified fan speculation about her possible involvement in the MCU.
Interestingly, early-stage productions sometimes use vague role titles to conceal key characters or avoid spoilers. Because of this, fans believe the listing could still hint at a secret Marvel role, although nothing has been confirmed.
Since Marvel Studios has remained silent, the role remains purely speculative at this stage.
Avengers: Doomsday Rumors Fuel Valeria Richards Theory
Adding further fuel to the discussion, insider account Earth 616 speculated that Matilda Firth could potentially be portraying Valeria Richards, a key character in Marvel Comics connected to Doctor Doom as his goddaughter.
If this theory turns out to be true, it could suggest deeper ties between Avengers: Doomsday and the wider Fantastic Four storyline, especially as Marvel continues building its multiverse-driven narrative.
However, the insider also raised concerns about timeline consistency, stating that the theory may not:
“align with the timeline of the Doomsday and the events of the Fantastic Four: first steps.”
As a result, this theory remains uncertain and should be treated as speculation rather than confirmed information. Still, fans continue debating whether Marvel could be planning an unexpected introduction of Valeria earlier than expected.
Matilda Firth’s Previous Acting Roles
Before these rumors surfaced, Matilda Firth had already appeared in several well-known projects, including:
- Disenchanted
- Subservience
- Wolf Man
- Nine Perfect Strangers
- Mr. Bates vs Post Office
- The Power
- Hullraisers
- Time
In addition to these roles, she has steadily built a reputation as a versatile young performer, taking on both dramatic and genre-based projects.
As a result, linking her name to a major MCU production has naturally drawn increased attention from fans and industry watchers alike.
Massive MCU Cast Building for Avengers: Doomsday
Meanwhile, Avengers: Doomsday continues to assemble one of the largest ensemble casts in MCU history, with Marvel reportedly bringing together characters from multiple franchises and timelines.
Notably, Robert Downey Jr. will return as Victor von Doom / Doctor Doom. This return marks a major shift in the franchise and reshapes expectations for the upcoming storyline.
In addition, several major MCU stars are expected to return. These include:
Chris Evans, Chris Hemsworth, Anthony Mackie, Sebastian Stan, Paul Rudd, Florence Pugh, Simu Liu, Tom Hiddleston, and Pedro Pascal.
Furthermore, the film will also feature returning X-Men actors, such as Patrick Stewart, Ian McKellen, James Marsden, Alan Cumming, and Rebecca Romijn, making it one of the most ambitious crossovers in Marvel history.
With such a massive lineup, speculation continues to grow that even smaller or undisclosed roles could end up playing important narrative parts in the overall story.
Avengers: Doomsday is scheduled to release in theaters on December 18, 2026.
However, as production continues and Marvel Studios maintains strict secrecy, fans should expect more casting rumors, hidden role theories, and potential surprise reveals in the coming months. Until official confirmation arrives, all current reports remain speculative but highly discussed within the MCU community.
Stay tuned for the latest updates on MCU’s upcoming projects, and subscribe to Marvel Updates’ YouTube channel.
