Marvel Avengers Doomsday Biggest Secret Leaked? First Act Revealed!

July 9, 2025: The excitement around Marvel Avengers: Doomsday is building as fans eagerly await the next major Marvel Cinematic Universe (MCU) event after nearly five years. Directed once again by the Russo brothers, and with filming underway in the UK, early rumors suggest that the film will bring together multiple corners of the Marvel universe in an unprecedented crossover.

According to leaks from insiders Daniel Richtman and James Mack, the movie will begin with Shuri uncovering the threat of Incursions — catastrophic events where universes collide. She quickly informs key heroes like Captain America, Wong, Bruce Banner, and Captain Marvel. Meanwhile, the Fantastic Four arrive on Earth-616 seeking to rescue Franklin Richards, who has reportedly been kidnapped by the film’s main antagonist, Doctor Doom.

The story is said to explore the collision between the Earth-616 MCU universe and the X-Men Universe, with Doctor Doom and Franklin Richards trapped on this alternate world. The heroes must undertake a threefold mission: stop the Incursion, rescue the captives, and confront Doom himself.

A large ensemble is rumored to assemble, including fan favorites and new additions: Captain America (Sam Wilson), Wong, Hulk, Captain Marvel, Thor, Bucky Barnes, Yelena Belova, M’Baku, Namor, and the Fantastic Four. Notably, America Chavez will reportedly open portals to alternate realities, although her role may be limited.

The rumored storyline hints at initial conflict between heroes from the two universes that eventually leads to unity as they face a greater threat involving Doctor Doom, the TVA, and Loki.

Confirmed Cast

While these rumors generate excitement, the confirmed cast to date includes:

• Chris Hemsworth as Thor
• Vanessa Kirby as Sue Storm / Invisible Woman
• Anthony Mackie as Sam Wilson / Captain America
• Sebastian Stan as Bucky Barnes / Winter Soldier
• Letitia Wright as Shuri / Black Panther
• Paul Rudd as Scott Lang / Ant-Man
• Wyatt Russell as John Walker / U.S. Agent
• Tenoch Huerta as Namor
• Ebon Moss-Bachrach as Ben Grimm / The Thing
• Simu Liu as Shang-Chi
• Florence Pugh as Yelena Belova / Black Widow
• Kelsey Grammer as Henry McCoy / Beast
• Lewis Pullman as Robert Reynolds / Sentry
• Danny Ramirez as Joaquín Torres / The Falcon
• Joseph Quinn as Johnny Storm / Human Torch
• David Harbour as Alexei Shostakov / Red Guardian
• Winston Duke as M’Baku
• Hannah John-Kamen as Ava Starr / Ghost
• Tom Hiddleston as Loki
• Patrick Stewart as Charles Xavier / Professor X
• Ian McKellen as Erik Magnus Lehnsherr / Magneto
• Alan Cumming as Kurt Wagner / Nightcrawler
• Rebecca Romijn as Raven Darkhölme / Mystique
• James Marsden as Scott Summers / Cyclops
• Channing Tatum as Remy LeBeau / Gambit
• Pedro Pascal as Reed Richards / Mr. Fantastic
• Robert Downey Jr. as Victor Von Doom / Doctor Doom

What to Expect

With the return of Robert Downey Jr. as the enigmatic Doctor Doom and the involvement of multiple Marvel franchises, Avengers: Doomsday promises to be an ambitious multiverse saga that may redefine the MCU’s future. Fans are eager to see how the Russo brothers balance the massive ensemble and whether this film can match the emotional depth and spectacle of the original Infinity Saga.

Filming is underway, and the movie is expected to release in 2025. More official details will emerge as Marvel Studios ramps up promotion.