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Captain America: Brave New Worldis the fourth installment in theCaptain Americafranchise and could be directly connected to Robert Downey Jr.’sIron Man 3. Well, fans are excited about this possibility.

With Anthony Mackie portraying the lead role of Sam Wilson, the world is on edge to see how Mackie will handle the responsibilities thrust upon him by Steve Rogers. However, Harrison Ford’s alleged cameo in the film makes it all the more interesting.
Captain America 4And Robert Downey Jr.’sIron Man 3Are Connected?
It was the year 2013 when the MCU released the iconic Robert Downey Jr. filmIron Man 3.The film featured Downey Jr. as the main protagonist (of course) but also, Ben Kingsley as the iconic Trevor Slattery!
The film dealt with a virus called “Extremis” that would cause people to heat up, breathe fire, and explode (not good company for dinner). However, one thing seems to be connecting all the dots and that isHarrison Ford’supcoming portrayal of General Thaddeus ‘Thunderbolt’ Ross.

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All the symptoms stated above are also experienced by Red Hulk, who we know Thaddeus Ross is going to convert into once some mishap happens. So, what could be that mishap that gives Thaddeus Ross his powers and how does it connect toIron Man 3? This brilliant theory by aReddituser, has all the answers.
How Thaddeus Ross Is Going To Turn Into The Red Hulk!
Before we start the theory, we would like to state that nothing can be confirmed or denied at this point. These are just speculations and assumptions,and the MCU may decide to change its course.
Now that that’s out of the way, let’s start. General Thaddeus ‘Thunderbolt’ Ross was seen in the 2008 filmThe Incredible Hulkwhen he was experimenting with the Super Soldier Serum. InIron Man 3,the government finds a cure for these so-called “Extremists”.

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InAvengers: Infinity War,Thaddeus Ross talks to Rhodney about some heart surgery, and if Ross had some complications, the government would surely give him the cure for it.
Assuming that Ross had the Extremis virus, things would only seem to get worse if he was exposed to gamma rays. There are two ways that this could go down.
![Robert Downey Jr.’s Iron Man 3 [Credit: Marvel Studios]](https://i2.wp.com/fwmedia.fandomwire.com/wp-content/uploads/2024/05/31100953/Iron-Man-3-Credit-Marvel-Studios-1024x576.jpeg)
The first option would be that since the government doesn’t know the full limitations of Extremis, they would fill it up with Gamma rays (like what happened with Bruce Banner inThe Incredible Hulk).
The other option would be that General Thaddeus Ross accidentally gets exposed to Gamma rays and turns into the Red Hulk. This could potentially mean that we could get a cameo of Harrison Ford as the Red Hulk inCaptain America: Brave New World.

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And the simple point of Extremis is howRobert Downey Jr.’siconic film gets connected toCaptain America 4and sets up the upcoming film,Thunderbolts*.
Captain America 4andThunderbolts*are slated for a release date of 12 July 2025 and 14 August 2025 respectively.
Visarg Acharya
Senior Writer
Articles Published :3265
Visarg Acharya is a Senior Writer at FandomWire, majorly focusing on movies, with over 3000 articles published. He has been an entertainment journalist for the past three years and a copywriter at a corporation. Visarg usually covers news and theories on the MCU and the DCU, with an emphasis on Avengers and Superman; Game of Thrones, and more.A Tarantino fan, Visarg, spends his time critiquing various directors’ filmographies and watching them with curiosity. Medieval fantasy like The Lord of the Rings or sci-fi movies like Interstellar, watching the latest horror movies, and listening to Hans Zimmer become his comfort zone. When idle, he can be found reading fantasy novels with a terrible cup of coffee in hand.