Oscar Isaac Exits Star Wars Event; MCU Fans Speculate Moon Knight in Avengers: Doomsday

Rumors are swirling that Oscar Isaac might be reprising his role as Moon Knight in the upcoming Marvel blockbuster, Avengers: Doomsday. Fans are buzzing with excitement, and recent events have fueled speculation about Isaac's involvement in the film.

Over the weekend, Star Wars Celebration's official social media announced that Isaac would no longer be attending the event in Japan due to changes in his production schedule. This announcement, made back in February, had initially sparked rumors of Poe Dameron's return to the Star Wars universe, especially after Daisy Ridley confirmed her appearance in a new Star Wars film at Star Wars Celebration 2023. However, Isaac's sudden withdrawal has led fans to connect the dots with Avengers: Doomsday, which is currently being filmed in London.

Social media erupted with speculation as fans pieced together Isaac's potential involvement in Avengers: Doomsday.

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

While this theory remains unconfirmed, Marvel is known for its surprises. Isaac was not listed among the cast members revealed for Doomsday, but Marvel Studios producer Kevin Feige hinted at more surprises during a video call at CinemaCon, stating, "We revealed many, not all."

Isaac previously starred as Moon Knight in a six-episode series released in 2022, though no follow-up has been announced yet. Avengers: Doomsday is slated for release on May 1, 2026, promising a grand ensemble of returning heroes and new faces.

Meanwhile, MCU fans are also abuzz over Robert Downey Jr.'s recent Doctor Doom-themed birthday party invitation, adding another layer of intrigue to the Marvel universe's upcoming projects.

Last month's cast reveal for Avengers: Doomsday included a strong presence of veteran X-Men actors, such as Kelsey Grammer, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, and James Marsden, confirming a significant role for the X-Men in the film. Grammer, who played Beast in the Fox X-Men franchise, made his MCU debut in The Marvels' post-credits scene. Stewart, known for his role as Charles Xavier/Professor X, appeared briefly in the MCU in Doctor Strange in the Multiverse of Madness. McKellen, Cumming, Romijn, and Marsden are yet to make their MCU debuts, raising the intriguing question: is Avengers: Doomsday secretly an Avengers vs. X-Men movie?