Oscar Isaac Exits Star Wars Event, Sparks MCU Moon Knight Avengers Rumors

Rumors are swirling that Oscar Isaac might reprise his role as Moon Knight in the upcoming Avengers: Doomsday. Fans were taken aback by the possibility, especially after a recent announcement that has given the theory some credence.

Over the weekend, Star Wars Celebration's official social media announced that Isaac would not be attending the event in Japan this year due to "changes in his production schedule." This news came as a surprise, as Isaac's appearance had been eagerly anticipated following the announcement in February, which sparked speculation about his return as Poe Dameron in a new Star Wars film. The absence of Isaac at the convention, especially after Daisy Ridley's announcement of her return as Rey at Star Wars Celebration 2023, has fueled further speculation.

While the details of Isaac's production schedule changes remain undisclosed, fans quickly connected the dots to Avengers: Doomsday, which is currently being filmed in London. Social media buzzed with reactions:

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 note that this remains a fan theory. Marvel is known for its surprises, but Isaac was not included in the initial cast reveal for Doomsday. However, Marvel Studios producer Kevin Feige hinted at more cast members yet to be announced, stating at CinemaCon, "We revealed many, not all," leaving room for speculation.

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

Meanwhile, MCU fans are also buzzing about Robert Downey Jr.'s recent Doctor Doom-themed invitation for his 60th birthday party, adding another layer of intrigue to the Marvel universe.

Last month's Avengers: Doomsday cast reveal prominently featured veteran X-Men actors. Kelsey Grammer, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, and James Marsden are confirmed to appear, signaling a significant X-Men presence in the film. Grammer, who portrayed 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, had a brief appearance in the MCU via Doctor Strange in the Multiverse of Madness as part of the Illuminati. Meanwhile, McKellen, who played Magneto, along with Cumming (Nightcrawler), Romijn (Mystique), and Marsden (Cyclops), have yet to make their MCU debuts. This raises the intriguing question: could Avengers: Doomsday be setting the stage for an Avengers vs. X-Men showdown?