AnAvengers: Doomsdaytheory shakes up theMarvel Cinematic Universein a huge way by putting heroes against themselves with a heartbreaking twist. One of thebest films in the MCUwas based on a collision between heroes. That happens to beCaptain America: Civil War. The movie wasessentially an Avengers film with Captain America at its center. Despite Steve Rogers and Tony Stark’s opposing opinions about the Sokovia Accords leading to a huge battle between MCU heroes, they were never trying to kill each other during that fight.
However,Avengers: Doomsday’s storywill be darker than that of the Captain America film, which means all bets are off. For some time now, it has been believed that major MCU stars could be returning for theanticipated Marvel movieas evil versions of their characters. While the Multiverse Saga certainly allows that to happen, there would be a more impactful way of stillhaving heroes fight without resorting to the easiest alternative. That is where a new MCU theory comes in, as it uses what is known aboutAvengers: Doomsday’s cast to suggest an incredibly dark story could happen.

MCU Stars Are Returning For Avengers: Doomsday
The Movie’s Main Villain Is Played By The Franchise’s Biggest Actor
Several MCU stars were always going to be coming back forAvengers: Doomsday. After all,Marvel Studios' Avengers movies have grown exponentially in sizesince the first one was released in 2012. The Avengers franchise now uses characters from all over the MCU, which means the upcoming film could include the new Avengers, the Guardians of the Galaxy, the Young Avengers, and more. However, besides the confirmed return of actors still in the franchise, like Anthony Mackie as Captain America and Benedict Cumberbatch as Doctor Strange, stars who had left the MCU are also back forAvengers: Doomsday.
You’ve Already Seen The Superhero Team Captain America: Brave New World’s Post-Credits Teased According To Exciting Avengers: Doomsday Theory
A dark Avengers: Doomsday theory shows how the team Captain America: Brave New World teased has already debuted in the MCU and is quite powerful.
Robert Downey Jr. will play Doctor Doom in the movie, leaving Iron Man behind to become the main villain of the MCU’s Multiverse Saga. Reports claim thatCaptain America franchise stars Chris Evans and Hayley Atwell are also returningfor the film. With Downey’s confirmed return and Evans reportedly joining him, all the original Avengers are back in the franchise in some form. Chris Hemsworth’s Thor, Mark Ruffalo’s Hulk, and Jeremy Renner’s Hawkeye never left. As for Scarlett Johansson, she is a producer onThunderbolts*, reigniting her working relationship with Marvel. This could all tie into the next Avengers movie.

Avengers: Doomsday Theory Pits The New Avengers Against The MCU’s Original Heroes With A Twist
The Avengers Face An Impossible Situation
One of the most popular theories aboutAvengers: Doomsdayhangs on RDJ’s casting. With the actor as Doctor Doom,many believe that the original Avengers cast could come back as multiverse villains, either playing dark versions of their heroes, like Evans as Hydra’s Captain America from the comics, or new villains, as is Downey’s case. However, a newAvengers: Doomsdaytheory has a more heartbreaking suggestion about how the MCU could use the original Avengers now that they are all back in the franchise in some form, and it would be epic.
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Avengers: Secret Wars
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According to the theory, after incursions started to pop up in the MCU,Avengers: Doomsdaycould lead to the new Avengers fighting off a final incursion. It would be between Earth-616, the MCU’s main universe, and another wherea very similar version of the original Avengerslive. Only one universe can survive, so the audience is forced to be split between cheering the new Avengers on or supporting a version of the MCU’s original Avengers, the most beloved heroes in the franchise, to save their universe. This would cause conflicting feelings for MCU heroes — as they kill friends — and fans.

How Marvel Comics Sets Up The Perfect Avengers Vs Avengers Battle
Time Will Run Out For The MCU’s Multiverse Saga
In the “Time Runs Out” storyline in Marvel Comics, multiple teams of heroes fight one another. There is a growing concept of them versus us, asthe Illuminati, a team that has already appeared in the MCU, believed that the answer to saving its universe was destroying other universes. Steve Rogers, as the leader of S.H.I.E.L.D., gets two teams of Avengers to fight the Illuminati and Sunspot’s Avengers team. The comic book version of the story the Multiverse Saga will tell was all-in on the idea of heroes fighting each other and the inner turmoil they faced as universes collided.
Avengers: Doomsdaycan play with that same concept. Multiple superhero teams could come to blows over how to handle incursions. By using the original Avengers —Downey could easily play both Doctor Doom and an Iron Man variant— the MCU would create a conundrum for Eath-616’s heroes. That could even lead to some of them not wanting to fight the other heroes, while a portion of the characters could be in favor of destroying other universes to save theirs. The Avengers have the potential to be assembled again and later divided over morality questions inAvengers: Doomsday.

Avengers: Doomsday
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Avengers: Doomsday is the fifth Avengers film in the Marvel Cinematic Universe and will bring together heroes, new and old, to face off against Victor von Doom - played by the returning Robert Downey Jr.. Avengers 5 will also mark the beginning of phase 6 of the MCU.