Hold onto your hats, Marvel fans! The rumor mill is spinning with whispers that Oscar Isaac might be reprising his role as Moon Knight in the upcoming blockbuster, Avengers: Doomsday. This speculation gained traction after Star Wars Celebration announced that Isaac would not be attending their event in Japan due to changes in his production schedule.

Back in February, the announcement of Isaac's appearance at Star Wars Celebration sparked excitement and speculation about a potential return to the Star Wars universe as Poe Dameron, especially after Daisy Ridley's confirmation for a new Star Wars film at the 2023 Celebration. However, Isaac's sudden schedule change has fans connecting the dots to Avengers: Doomsday, which is currently filming in London.

Social media erupted with fans piecing together the clues:

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

While the theory remains unconfirmed, it's worth noting that Isaac's name was absent from the initial Avengers: Doomsday cast reveal. However, Marvel Studios producer Kevin Feige hinted that not all cast members were disclosed during the livestream announcement at CinemaCon, stating, “We revealed many, not all.” This leaves the door open for surprises, and fans are hopeful.

Isaac previously starred in the six-episode Moon Knight series released in 2022, but no follow-up has been announced. Avengers: Doomsday is slated for release on May 1, 2026, promising an epic ensemble of returning heroes and new faces.

In other MCU news, fans are buzzing over Robert Downey Jr.'s intriguing Doctor Doom-themed birthday invitation, adding another layer of mystery to the Marvel universe.

Meanwhile, last month's Avengers: Doomsday cast reveal was a major event, particularly for fans of the X-Men. Veterans like Kelsey Grammer (Beast), Patrick Stewart (Professor X), Ian McKellen (Magneto), Alan Cumming (Nightcrawler), Rebecca Romijn (Mystique), and James Marsden (Cyclops) are set to join the fray, signaling a significant X-Men presence in the film. This has led to speculation that Avengers: Doomsday might secretly be setting the stage for an Avengers vs. X-Men showdown.