A surprising new rumor about Avengers: Doomsday has sparked excitement among Marvel fans. Reports suggest a beloved mutant could join the X-Men in a massive showdown against the Avengers and the Fantastic Four. While nothing is official yet, the speculation is fueling discussions across social media and fan forums.
This potential crossover could mark one of the most ambitious events in the MCU, blending mutants with Earth’s Mightiest Heroes in ways never seen before.
Avengers: Doomsday Rumor Explained
According to industry scooper MyTimeToShineHello (MTTSH), a fan-favorite mutant may play a pivotal role in Avengers: Doomsday. This character could assist the X-Men in the upcoming multiversal battle against the Avengers and the Fantastic Four.
It is essential to note that this information is unverified. Until Marvel Studios makes an official announcement, fans should treat it strictly as a rumor. However, given Marvel’s track record of surprise cameos and crossovers, the possibility is exciting.
Deadpool’s Rumored Role
The rumor specifically points to Deadpool, portrayed by Ryan Reynolds, as the mutant who may side with the X-Men. MTTSH stated:
“Deadpool is in Doomsday and helps the X-Men fight the Avengers and the Fantastic Four.”
If true, this would be Deadpool’s most significant MCU appearance to date. Known for breaking the fourth wall and his unpredictable antics, Deadpool joining the X-Men against the Avengers could inject humor, chaos, and unexpected twists into the storyline.
Ryan Reynolds Previously Teased Chaos
Speculation around Deadpool intensified after Reynolds shared an image in August 2025 featuring the Avengers logo with an anarchy symbol layered on top. Fans immediately assumed this hinted at Deadpool clashing with the Avengers in Avengers: Doomsday.
Reynolds later clarified during an interview with Collider:
“The thing I posted on social, that is actually a variant of the flag that we use in Deadpool & Wolverine. It was my favorite.”
He also addressed Deadpool’s future in the MCU:
“They’re still figuring it out.”
This explanation confirms that while Deadpool’s exact role is undecided, Marvel Studios is actively planning how to integrate him into the broader MCU.
Avengers: Doomsday Release Date and Creative Team
Marvel Studios has already confirmed several key details about Avengers: Doomsday, including its release date on December 18, 2026. The film will be directed by Anthony Russo and Joe Russo, with a screenplay written by Michael Waldron and Stephen McFeely. Given the Russo brothers’ extensive experience handling massive ensemble films such as Avengers: Infinity War and Avengers: Endgame, fans can anticipate a high-stakes, multiversal spectacle filled with action, drama, and unexpected twists.
Deadpool does join the X-Men, Avengers: Doomsday could explore internal MCU conflict on a massive scale. Mutants could become central figures in the next phase of the MCU, while also allowing the franchise to expand storytelling possibilities in future films and Disney+ series.
While the Deadpool-X-Men rumor remains unconfirmed, it adds another exciting dimension to Avengers: Doomsday. Whether or not this crossover occurs, anticipation for the film is already at an all-time high. Fans should stay tuned for official announcements from Marvel Studios as the release date approaches.
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