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

The rumor mill is churning with exciting news: Oscar Isaac might be reprising his role as Moon Knight in the upcoming blockbuster, Avengers: Doomsday. This speculation gained traction following an announcement from Star Wars Celebration’s social media, revealing that Isaac would not be attending the convention in Japan due to changes in his production schedule. Initially, fans speculated about a potential return to the Star Wars universe as Poe Dameron, especially after Daisy Ridley announced her return at Star Wars Celebration 2023. However, the buzz quickly shifted to Marvel’s universe.

With Avengers: Doomsday currently in production in London, fans are connecting the dots. Social media erupted with comments like:

He’s gonna be filming doomsday?

— James Young (@YoungJames34) April 4, 2025

Doooomsday

— G the Gamer (@G_da_Gamer) April 4, 2025

Doomsday

— Taco John (@SWaddict_) April 4, 2025

Despite the excitement, it's important to note that this is still just a theory. Marvel is known for its surprises, and while Isaac wasn't part of the initial cast reveal for Doomsday, Marvel Studios producer Kevin Feige hinted that not all cast members were disclosed during the livestream. "We revealed many, not all," he stated during a video call at CinemaCon, leaving room for speculation and hope.

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

Meanwhile, MCU enthusiasts are also abuzz about Robert Downey Jr.’s recent Doctor Doom-themed 60th birthday party invitation, adding another layer of intrigue to the unfolding Marvel saga.

The Avengers: Doomsday cast reveal last month featured a significant number of veteran X-Men actors, including Kelsey Grammer (Beast), Patrick Stewart (Professor X), Ian McKellen (Magneto), Alan Cumming (Nightcrawler), Rebecca Romijn (Mystique), and James Marsden (Cyclops). This lineup suggests a major role for the X-Men in the film, with Grammer already making his MCU debut in The Marvels' post-credits scene, and Stewart briefly appearing in Doctor Strange in the Multiverse of Madness. This raises the question: could Avengers: Doomsday be setting the stage for an epic Avengers vs. X-Men showdown?