Hold onto your capes, Marvel fans, because whispers are swirling that Oscar Isaac might be reprising his role as Moon Knight in the upcoming blockbuster, *Avengers: Doomsday*. Yes, you read that right—Isaac's potential return has fans buzzing with excitement and speculation.
The buzz started when Star Wars Celebration's official social media announced that Isaac would not be attending the event in Japan this year, citing changes in his production schedule. This news came as a surprise, especially since his attendance was a major draw, fueling rumors of a possible return to the Star Wars universe as Poe Dameron. However, with *Avengers: Doomsday* currently filming in London, fans quickly connected the dots, theorizing that Isaac might be gearing up to don the Moon Knight costume once more.
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
While this theory is thrilling, it remains unconfirmed. Marvel is known for its surprises, and although Isaac wasn't listed in the initial *Doomsday* cast reveal, Marvel Studios producer Kevin Feige hinted that not all cast members were disclosed. During a video call at CinemaCon, Feige stated, "We revealed many, not all," leaving the door open for surprises like Isaac's possible involvement.
Isaac previously starred in the six-episode *Moon Knight* series released in 2022, but Marvel has yet to announce a second season. Meanwhile, *Avengers: Doomsday* is slated for a May 1, 2026 release, promising an epic ensemble of returning heroes and new faces, as showcased in the recent livestream.
In other MCU news, fans are also abuzz about Robert Downey Jr.'s recent Doctor Doom-themed birthday party invitation, adding another layer of intrigue to the unfolding Marvel saga.
The cast reveal for *Avengers: Doomsday* last month was packed with veteran X-Men actors, signaling a major role for the X-Men in the film. Kelsey Grammer, who played Beast in the Fox X-Men franchise, made his MCU debut in *The Marvels'* post-credits scene. Patrick Stewart, known for his role as Charles Xavier/Professor X, appeared in *Doctor Strange in the Multiverse of Madness* as part of the Illuminati. Other confirmed cast members include Ian McKellen as Magneto, Alan Cumming as Nightcrawler, Rebecca Romijn as Mystique, and James Marsden as Cyclops, none of whom have yet appeared in the MCU. This lineup raises an intriguing question: is *Avengers: Doomsday* secretly an Avengers vs. X-Men movie?
