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

Hold onto your seats, Marvel fans, because rumors are swirling that Oscar Isaac might reprise his role as Moon Knight in the upcoming blockbuster, Avengers: Doomsday. This speculation gained traction following a surprising announcement from Star Wars Celebration’s official social media, which revealed that Isaac would no longer be attending the convention in Japan due to "changes in his production schedule." Isaac was originally slated to appear at the event, sparking excitement about potential announcements regarding his character, Poe Dameron, in the Star Wars universe. However, with Avengers: Doomsday currently in production in London, fans are connecting the dots, suggesting Isaac's new commitments might involve filming as Moon Knight.

Social media buzzed with reactions to the news:

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 these connections are exciting, it's important to remember this is still just a theory. Isaac was not included in the initial Avengers: Doomsday cast reveal. However, Marvel Studios producer Kevin Feige hinted at CinemaCon that the livestream did not showcase the entire cast, stating, “We revealed many, not all.” This leaves room for speculation and hope among fans.

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

In other MCU news, fans are also abuzz about Robert Downey Jr.'s recent Doctor Doom-themed birthday party invitation, further fueling speculation and excitement around upcoming projects.

Last month's Avengers: Doomsday cast reveal was notable for its inclusion of veteran X-Men actors, confirming the significant role of the X-Men in the film. Kelsey Grammer, who played Beast, made his MCU debut in The Marvels' post-credits scene. Patrick Stewart, known for portraying Charles Xavier/Professor X, appeared in Doctor Strange in the Multiverse of Madness. Other actors set to join the MCU include Ian McKellen as Magneto, Alan Cumming as Nightcrawler, Rebecca Romijn as Mystique, and James Marsden as Cyclops. This lineup prompts the intriguing question: is Avengers: Doomsday secretly an Avengers vs. X-Men movie?