Hold onto your seats, Marvel fans, because Oscar Isaac might be making a thrilling return as Moon Knight, and not just in any movie, but in the highly anticipated Avengers: Doomsday. While this news may come as a surprise, recent events are lending credence to this exciting theory.

Over the weekend, the official social media channels for Star Wars Celebration announced that Isaac would no longer be attending the beloved convention in Japan this year. The reason? "Changes in his production schedule." This announcement came after much excitement in February when Isaac was initially slated to appear, fueling speculation about Poe Dameron's return to the Star Wars universe. Following Daisy Ridley's announcement of her return at Star Wars Celebration 2023, fans were eagerly anticipating what Isaac might reveal.

While the specifics of Isaac's schedule changes remain undisclosed, the fact that Avengers: Doomsday is currently in production in London has led fans to connect the dots and speculate about Moon Knight's involvement in the film. Social media buzzed with excitement and 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 buzz, it's important to note that this remains a theory. Isaac wasn't listed among the many actors revealed for Doomsday's cast. However, Marvel Studios producer Kevin Feige hinted at more surprises, stating at CinemaCon that the livestream did not include the entire cast: "We revealed many, not all," leaving room for speculation and hope among fans.

Isaac previously starred in the six-episode series Moon Knight released in 2022, but a second season has yet to be announced. Avengers: Doomsday is slated for a May 1, 2026 release and promises to bring back a host of beloved heroes and familiar faces, as showcased in the epic livestream.

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

Last month's Avengers: Doomsday cast reveal was particularly exciting for fans of the X-Men, with veterans like Kelsey Grammer, Patrick Stewart, Ian McKellen, Alan Cumming, Rebecca Romijn, and James Marsden all confirmed to appear. 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) have yet to make their MCU debuts. This significant inclusion of X-Men characters raises an intriguing question: is Avengers: Doomsday secretly an Avengers vs. X-Men movie?