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

Hold onto your hats, Marvel fans—rumors are swirling that Oscar Isaac could be reprising his role as Moon Knight in the upcoming blockbuster, Avengers: Doomsday. Surprised? You're not alone. This buzz started gaining traction after Star Wars Celebration announced that Isaac would no longer be attending their event in Japan due to changes in his production schedule. Initially, fans speculated that Isaac's absence might hint at a return to the Star Wars universe as Poe Dameron, especially following Daisy Ridley's announcement of her involvement in a new Star Wars film at the 2023 celebration.

While the specifics of Isaac's scheduling conflict remain under wraps, the fact that Avengers: Doomsday is currently being filmed in London has led many to connect the dots to Moon Knight. Social media erupted with speculation:

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

However, it's important to keep in mind that this remains just a theory. While Isaac was not part of the initial cast announcement for Doomsday, Marvel Studios producer Kevin Feige hinted during a CinemaCon video call that not all cast members were revealed: "We revealed many, not all," he teased. This leaves the door open for surprises, and fans are certainly hoping for Isaac's return as Moon Knight.

Isaac previously starred in the six-episode Moon Knight series released in 2022, and while there's been no official word on a follow-up, the possibility of his character joining the ensemble cast of Avengers: Doomsday—set to premiere on May 1, 2026—has fans buzzing.

Meanwhile, the Marvel Cinematic Universe (MCU) community is abuzz with other intriguing developments. For instance, Robert Downey Jr.'s recent Doctor Doom-themed birthday invitation has sparked curiosity and speculation among fans about potential new storylines or character arcs.

Last month's cast reveal for Avengers: Doomsday was packed with familiar faces from the X-Men universe, confirming their significant role in the upcoming film. Notable names include Kelsey Grammer, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, and James Marsden. 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 as a member of the Illuminati. Meanwhile, McKellen (Magneto), Cumming (Nightcrawler), Romijn (Mystique), and Marsden (Cyclops) are yet to make their MCU debut. This heavy inclusion of X-Men characters raises an intriguing question: is Avengers: Doomsday secretly an Avengers vs. X-Men movie?