In an intriguing turn of events, Oscar Isaac might be reprising his role as Moon Knight in the upcoming film, Avengers: Doomsday. The speculation began when Isaac unexpectedly withdrew from his scheduled appearance at Star Wars Celebration in Japan, citing changes in his production schedule. This announcement, originally made in February, had sparked excitement about a potential return as Poe Dameron in the Star Wars universe, following Daisy Ridley's confirmation for a new film at the 2023 event.

While the specifics of Isaac's new commitments remain undisclosed, fans quickly connected the dots to Avengers: Doomsday, which is currently in production in London. Social media buzzed 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

Despite the excitement, it's important to note that this is still just a theory. Isaac's name was absent from the initial cast reveal for Avengers: Doomsday. However, Marvel Studios producer Kevin Feige hinted at more surprises during a CinemaCon video call, 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 officially announced. Avengers: Doomsday is slated for release on May 1, 2026, and promises an epic ensemble of returning heroes and new faces, as highlighted in the recent livestream.

In other MCU news, fans are also abuzz about Robert Downey Jr.'s recent Doctor Doom-themed birthday invitation, adding another layer of intrigue to the unfolding narrative.

The cast reveal for Avengers: Doomsday last month prominently featured veteran X-Men actors, including Kelsey Grammer, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, and James Marsden. This inclusion strongly suggests a significant X-Men presence in the film. Grammer's Beast made his MCU debut in The Marvels' post-credits scene, while Stewart briefly appeared as Professor X in Doctor Strange in the Multiverse of Madness. Meanwhile, McKellen, Cumming, Romijn, and Marsden have yet to make their MCU debuts. This raises the intriguing possibility: could Avengers: Doomsday be setting the stage for an Avengers vs. X-Men showdown?