Rumors are swirling that Oscar Isaac might be reprising his role as Moon Knight in the upcoming blockbuster Avengers: Doomsday. This speculation gained traction after Isaac unexpectedly canceled his appearance at the Star Wars Celebration in Japan due to changes in his production schedule. Previously, fans were buzzing with excitement over the possibility of Isaac returning as Poe Dameron in the Star Wars universe, especially following Daisy Ridley's announcement of her involvement in a new film at Star Wars Celebration 2023.
The sudden shift in Isaac's schedule has led many to speculate that he might be joining the cast of Avengers: Doomsday, which is currently filming in London. Social media platforms erupted with fans piecing together the clues:
He’s gonna be filming doomsday?
— James Young (@YoungJames34) April 4, 2025
Dooooomsday
— G the Gamer (@G_da_Gamer) April 4, 2025
Doomsday
— Taco John (@SWaddict_) April 4, 2025
Despite the excitement, it's important to remember that this is still just a theory. Isaac's name was notably absent from the initial cast reveal for Avengers: Doomsday. However, Marvel Studios producer Kevin Feige hinted at more surprises, stating at CinemaCon, "We revealed many, not all," leaving the door open for additional cast members like Isaac to join the fray.
Isaac's portrayal of Moon Knight in the 2022 six-episode series was well-received, but a follow-up season has yet to be confirmed. Meanwhile, Avengers: Doomsday is slated for a theatrical release on May 1, 2026, and promises to feature a robust lineup of returning heroes and new faces as highlighted in the epic livestream.
In other Marvel news, fans are also buzzing about Robert Downey Jr., who recently teased a Doctor Doom-themed invitation for his 60th birthday party, adding another layer of intrigue to the MCU's future.
The cast reveal for Avengers: Doomsday last month was particularly notable for its inclusion of veteran X-Men actors, such as Kelsey Grammer as Beast, Patrick Stewart as Charles Xavier/Professor X, Ian McKellen as Magneto, Alan Cumming as Nightcrawler, Rebecca Romijn as Mystique, and James Marsden as Cyclops. This heavy X-Men presence has sparked speculation about whether Avengers: Doomsday might secretly be an Avengers vs. X-Men movie. Grammer made his MCU debut in The Marvels' post-credits scene, while Stewart briefly appeared in Doctor Strange in the Multiverse of Madness as part of the Illuminati. McKellen, Cumming, Romijn, and Marsden, however, are yet to make their MCU debuts, adding to the anticipation and mystery surrounding the film.
