Summary
3 years ago, theMCUintroduced a glaring plot hole that has been gnawing at internet audiences ever since - but theCaptain America: Brave New Worldadamantium twist is finally fixing it.Captain America: Brave New Worldis Sam Wilson’s first solo movie and will reportedly adhere to the grounded tone set byCaptain America’s previous three outings. Even so, it is also confirmed to be starring a litany of larger-than-life characters and concepts.
Story details forCaptain America: Brave New Worldhave been emerging steadily over the past few months, with some significant recent highlights.Harrison Ford’s debut as President Ross/Red Hulkis one of the most exciting of these, with Captain America’s relationship with him and the US government poised to be put under significant strain. Another is the revelation that Ross' administration will finally address the plot thread that has been left hanging sinceEternalswas released in 2021.

Captain America: Brave New World Cast & Marvel Character Guide
Sam Wilson’s big-screen debut as the MCU’s Captain America will bring back several familiar faces, while also introducing new and exciting characters.
The MCU’s Unaddressed Celestial Plot Hole Makes A Lot More Sense Now
Eternalsconcluded with the titular team successfully halting the emergence of the Celestial Tiamut on Earth. Unfortunately, their success came with a consequence: the gargantuan, partially-emerged, calcified corpse of the Celestial that was left jutting from the Indian Ocean. Since then, the corpse has remained conspicuously unaddressed save for a brief headline mentioning the body inShe-Hulk: Attorney At Law. Recent footage forCaptain America: Brave New Worldhas now confirmed that it will be the MCU movie to break this frustrating secrecy while simultaneously justifying it.
Exclusive footage revealed at this year’s San Diego Comic-Con confirmed that the corpse of Tiamut contains adamantium, a hitherto nonexistent material in the MCU’s Earth-616. This makes Tiamut’s corpse an exceptionally valuable resource for worldwide powers to exploit, especially if it boasts the same properties as the adamantium of Marvel Comics. With that in mind, the widespread national interest in seizing as much of the material as possible explains why intervening MCU movies have yet to address the plot hole, placing that responsibility at the feet of the hero most closely tied to terrestrial politics.

Captain America 4 Explains Why Other MCU Characters Don’t Know Much About The Celestial
The intentional lack of publicity surrounding Tiamut would explain why the heroes in the intervening movies have not yet addressed the Celestial in the ocean.
The confirmation that world powers are expressly interested in harvesting adamantium from Tiamut’s corpse helps explain why it remains unaddressed by other MCU characters 3 years later. The MCU has a track record of portraying government officials as being underhanded and even villainous in a selection of storylines. It stands to reason, then, thatthe US government, under what is sure to be a quasi-antagonist President Ross, will be harvesting Tiamut covertly, attempting to get the jump on other nations to ensure the lion’s share of adamantium belongs to the USA.
The intentional lack of publicity surrounding Tiamut would explain why the heroes in the intervening movies have not yet addressed the Celestial in the ocean. Covert operations may have been underway throughout the last three years, though without it posing a threat significant enough to distract Doctor Strange from his multiversal struggles or Captain Marvel from her cosmic ones, the reasons for their intervention are diminished. Captain America, on the other hand, is about to encounter a challenge that, for him, hits particularly close to home.
Marvel’s Adamantium Change Sets Up A New Version Of The Vibranium Storyline For The MCU
Vibranium was introduced inCaptain America: The First Avengerin the form of Cap’s shield - the very same that Sam Wilson struggled to justify himself wielding inThe Falcon and the Winter Soldier. This exceptionally rare and powerful material was also central toBlack Panther, as Wakanda wrestled with its exclusive access to the resource. With the introduction of the more accessible adamantium,the MCU is poised to deliver a new take on the political implications inflicted by a limited precious resource.
In Marvel Comics, Captain America has wielded shields made of vibranium, adamantium, and an alloy of vibranium and an unknown substance dubbed “proto-adamantium.”
The introduction of this metal may stoke a plethora of new conflicts within the MCU. Vibranium has put Wakanda at odds with external forces multiple times inthe MCU timeline, while nefarious actors like Ultron attempt to wield it to near catastrophic results. Then there are the more exciting implications of its introduction inCaptain America: Brave New World, withthe MCU’s version of Wolverinebeing closer than ever to his anticipated debut.
Captain America: Brave New World
Cast
Captain America: Brave New World (formerly titledNew World Order)marks Sam Wilson’s first MCU big-screen appearance as Steve Rogers' successor after receiving the suit and shield in Phase 4’s The Falcon and the Winter Soldier. Anthony Mackie returns as the titular Avenger alongside Danny Ramirez as Joaquin Torres, Carl Lumby as Isaiah Bradley, and Tim Blake Nelson as The Incredible Hulk’s former ally Samuel Sterns. Harrison Ford makes his MCU debut replacing the late William Hurt as Thaddeus Ross.After meeting President Thaddeus Ross, Sam is caught in a global crisis. He must expose the mastermind behind a sinister plot before the world descends into turmoil. Captain America: Brave New World marks the big-screen debut of Sam Wilson as Captain America, and Harrison Ford makes his MCU debut, replacing the late William Hurt as Thaddeus Ross.