15 Of 2021's Most Interesting MCU Fan Theories

List Rules
Vote up your favorite MCU fan theories.

Marvel made 2021 the year of the MCU, with releases such as Spider-Man: No Way Home, Black Widow, Shang-Chi, Wandavision, Loki, and more. With such releases came a multitude of fan theories, enough to fill up the Multiverse. 

Here are a few MCU fan theories from this year that we thought were extra-interesting. Vote up your favorites!


  • Doctor Strange Didn't Tell Tony Stark About His Death Because Other Timelines Revealed That Telling Him Would Cause Them To Fail
    Photo: Avengers: Infinity War / Walt Disney Studios Motion Pictures

    From Redditor u/sonnytron:

    In some timelines, too much information led to Tony not taking part in the Time Heist because of his fear of his daughter growing up without him. In others, he participated but with hesitation and fear, which led to failure. 

    The other outcome? Tony and Pepper don't have Morgan at all. Tony's knowledge of his fate led to him not having a daughter with Pepper at all, which led to Tony going into the Time Heist with too much aggression. 

    And also, Tony's relationship with Morgan is what made him think of Peter before attempting to create the Time Travel GPS.

    211 votes
  • Black Widow And Captain America Lived Through The Bunker Bombing Because Tony Stark Was No Longer The Weapons Supplier For The US Military
    Photo: Captain America: The Winter Soldier / Walt Disney Studios Motion Pictures

    From Redditor u/WhoisJohnFaust:

    In Winter Soldier, Cap and Natasha are talking to Zola in an old Shield bunker and are told of an oncoming bunker-busting airstrike. They survived, and that didn't make sense. However, Stark is no longer the primary weapons supplier for the US military. That contract went to Hammer Industries, whose premier bunker-busting warhead The Ex-Wife... doesn't work. 

    If Shield used the Ex-Wife on the bunker, it makes sense why they survived, because it was already established in Iron Man 2 that it didn't work well. This must've been the mark two Ex-Wife, which blows up, but not enough the kill the inhabitants of the bunker. 

    Had the military been using Stark Tech, they would've used a Jericho missile, and the entire franchise would've been over right there. 

    130 votes
  • The One Reality Doctor Strange Saw Wasn't Actually The Only One That Showed A Positive Outcome 
    Photo: Avengers: Infinity War / Walt Disney Studios Motion Pictures

    From Redditor u/sonnytron:

    I don't think he was lying... I think he just couldn't see past the scenarios where he died because he couldn't see what would happen afterwards. 

    So by nature of him not being able to see past his own death, he couldn't see scenarios where he lived and Tony survived, but they won. 

    So for me, I see this as his thoughts when he told Tony:

    "Out of 14,000,605 possible endings to the coming battle, narrowed down to the ones where I survive, or I die and come back to life, I only see one where we win. There might be more, but because I can't see them, I have to treat them as not existing... which means I can't find a way where we win and you don't die. 

    181 votes
  • Thanos Gave Loki The Mind Stone To Corrupt Him And Distract The Asgardians So He Could Invade Nidavellir
    Photo: Marvel's The Avengers / Walt Disney Studios Motion Pictures

    From Redditor u/TheMediocreCritic:

    Thanos manipulated Loki by giving him the Mind Stone and orchestrated the New York attack to divide and distract the Asgardians. With the Asgardian royalty destabilized and fighting amongst themselves, he could attack the unprotected forge of Nidavellir, the only place capable of forging a device strong enough to hold the Infinity Stones. 

    145 votes
  • From Redditor u/Ed_Derick:

    In the first episode of Loki, Loki questions why the TVA didn't arrest the Avengers after time traveling. They explain that the Avengers are meant to time travel, it's in their written fate. Then in the end we find out that The One Who Remains (a.k.a. Kang the Conqueror, a.k.a. Immortus) is the one who writes the fate of every being in every universe in the Multiverse, so he can stop evil variants of him from appearing, so they don't cause another Multiversal war. But why did he write Infinity War and Endgame? Why let Thanos win, then get defeated?

    My explanation is, Kang needs the Time Travel technology so the TVA can exist, and the only way he gets it is if Tony Stark invents it. Remember, the Multiverse is in an infinite cycle of death and rebirth and things need to play exactly as they did before, so Nathaniel Richards can become Kang and create the TVA. He made Infinity War, so Tony Star, could have motivation to create Time Travel, because he must've figured out that Tony is the only one who could do it. Then in the 31st century, Kang obtains the technology and improves it, creating the Time Doors and becoming the one who decides the fate of all. 

    127 votes
  • 6
    144 VOTES

    Tony Stark Didn't Invent Time Travel, Only A Way To Jump Around The Multiverse 

    Tony Stark Didn't Invent Time Travel, Only A Way To Jump Around The Multiverse 
    Photo: Avengers: Endgame / Walt Disney Studios Motion Pictures

    From Redditor u/Hickspy:

    Stark didn't build a time machine as he understood it. He built a way to jump between points in the multiverse and enter them at specific points, before returning to their original verse where time was continuing like normal. The places they went to were just so close to their original world that they didn't realize it was a different universe. 

    Here's why:

    From a time travel standpoint, there's no way they could "preserve" their own timeline after all the sh*t they did in them. The things they did would have completely screwed up the flow of time. For example:

    1. Knocking out Peter Quill on Morag, who we saw beat Korath to the Power Stone by about... 15 seconds?

    2. Stealing Hank Pym's particles. We saw he's incredibly protective of his work, so imagine how it would set him off if a batch of his stuff disappeared in the 70s. 

    3. Captain America literally encountering and fighting himself. And also revealing that Bucky is alive much earlier. 

    4. The entire sequence of events in Loki

    These things reflect major changed that would've happened to the "timeline." So either the idea of "the past" is that nothing you do matters, or you can seriously screw it up. The ideas contradict each other. Steve Rogers putting the infinity stones back at the exact moments they were taken doesn't UNDO all the other stuff that happened in those times. The only way this makes sense is that they are accidentally creating a new branch of the multiverse instead of time traveling to the past. 

    Of course, the TVA probably showed up and destroyed the place 10 seconds after Steve returned the stones anyways. 

    144 votes