The Avengers: Endgame Timeline Explained (Spoilers)
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The Avengers: Endgame Timeline Explained (Spoilers)


This is the Avengers: Endgame timeline explained with science. (dramatic music) Even if you’re not a Marvel nerd, it’s hard to argue that the Marvel Cinematic Universe isn’t incredibly impressive as a venture in storytelling, in business, and in pop culture. Over 10 years, billions and billions of dollars, 22 films, some of which are the most successful of all time, and now with Endgame, this era of the MCU closes with a culmination of a truly epic arc. But because Marvel has decided to be so delightfully science-y in many of its movies, is there a way for us to more realistically interpret what actually happened in Endgame. Let’s figure it out. (electronic music) I guess we’re in the Endgame now. Before we get started, we are going to be literally spoiling the entirety of Avengers: Endgame, so if you have not seen the movie yet, you absolutely have to turn back right now. By the end of Infinity War, Thanos has won, dusting half of the universe in the process. To reverse this terrible deed and to avenge all those who fell, the remaining Avengers have a plan, jump into the quantum realm multiple times in order to time travel, steal the Infinity Stones in the past, and undo the snap in the present. It’s a mind-bending and satisfying end to a decade-long story. Time travel is inherently confusing, so how exactly did the Avengers accomplish this? What did their path through space-time actually look like? I escaped the void for a brief and beautiful moment of time just to attend the world premiere, somehow, of Avengers: Endgame with a notepad, in order to take down notes in the dark to get out a video just in time for all of you nerds, and this is what I came up with. These are the events of Avengers: Endgame laid out chronologically with all the weird time-travelly stuff going on. This is what we have to science. Is any of this plausible with the laws of physics as we know ’em? Is Professor Hulk better than the regular Hulk? We’ll come back to this in a bit. But not the Professor Hulk thing, he’s much, much better. First, let’s do our best to wrap our heads around what time travel actually is. From a scientific perspective, traveling to different points in time is like traveling to different points in space, like I just did. If this is a graph of my position, I went from here to here. Now, let’s add time to the mix. When I took that step, it had to of occurred over some time, and when I trace that path, you can see that I am taking a path through both time and space, but because we’re talking about space-time, we also need some kind of boundary here that would prevent us from going faster and further than light could in this same space-time. This is our light-speed boundary. Now, if we add the rest of three-dimensional space, x, y, and z, except we are suppressing z here, because we cannot see in four dimensions, we can trace every single point in space and time that you could possibly take, and this is what physicists call your world line. Finally, if we rotate our light-speed boundary across all the other dimensions, we get what looks like a cone, what scientists call your light cone, so now, we have a world line, which is your entire life history at every point in space and every point in time, and then your light cone, which defines every single point in space-time where you could go or have been. Light cones are what we are going to mess with to travel through time. Oh… Hey! The easiest way to travel through time is to go forwards in time. You and I are traveling forwards into the future right now, at the blistering pace of one second every second. If you want to travel into the future faster than this, you either have to go really, really, really fast, or you have to get near something really heavy. Wow, it’s good to have that back. Let’s draw our diagram again, and this time assume that we have two individuals, one going really, really fast, and one standing still as space-time progresses. It’s nice to have you back, too, buddy. The really, really weird thing is is that even though this looks like more time is passing for the person who is going super, super fast, when you go that fast, space-time squishes. Once space-time has squished, due to her immense speed, you can see that the time that has passed for Captain Marvel from Spider-man’s perspective is actually less than the amount of time that has passed for Spider-man. This is forwards time travel, because, from Carol’s perspective, she has aged less than the rest of the universe. Now, we’ve never gone Captain Marvel fast to make significant forward time travel a thing, but we have gone fast enough to see forward time travel effects. Over his over 800 days in space, orbiting the Earth at many kilometers per second, cosmonaut Sergei Krikalev has aged 22.68 milliseconds less than all of us here on Earth. Right now, he is the record holder for time travel. If you get very close to something extremely massive, you can travel forwards in time, too. For example, take the ultra-massive, and recently imaged, M-87 Star black hole, this is it projected through time. Because extremely large masses can warp space-time in weird ways, your light cone will start to squish and tilt and tip over the closer you get to a black hole, and so time will pass more slowly for you, as if you were going ultra fast. You can see right here, at this exact distance from the black hole, your light cone tips over so much that your world line, the only possible path that it can take, is into the black hole, because otherwise, you will be violating the light-speed boundary, and as far as we know, humans cannot travel faster than the speed of light. I know, I said, humans can’t travel, anyway, this actually defines what is called the event horizon, and this is why scientists say at this point, not even light can escape. The closer you get to a black hole, the less time passes for you, relative to the rest of the universe, and you travel forwards through time. You look fantastic for, like, 70? Traveling to the future is fine, and very possible, but it doesn’t exactly help you address a certain snap, and going back to the past is a whole different endgame. I’m gonna say this right up front, okay, most scientists who spend their lives thinking about this kind of thing think backwards time travel is probably impossible. There may be some weird hypothetical situations, yeah, not yet, there may be some weird hypothetical situations, or some kind of weird, exotic matter, that might make these situations more possible, but these explanations themselves are extremely unlikely. All of that being said, though, what if you could make a wormhole that traveled at the speed of light? Let’s say that Tony Stark anticipated the Battle of New York in 2012. He used billions and billions of Stark bucks to somehow make a wormhole that connected two different points in space and time, and whatever technology was holding those wormholes open could also move them through space-time at incredible speed. Now, let’s say that he constructed the wormhole in 2008, right after he became Iron Man, as some kind of insurance policy. He, then, spent the next few years accelerating one of these ends at near the speed of light. Because of the kind of forward time travel that we just talked about, when this end stopped accelerating, it would actually be younger than the rest of the universe, maybe the rest of the universe is at 2019 now. The really weird thing about wormholes is is that time is synchronous through them, so if Iron Man and the rest of the Avengers now entered the wormhole that had an age of 2012, they would emerge from the other end in the year 2012, right before the Battle of New York. Another suitably–
I was gonna say that, future me, shut up. Another suitably superhero-y way to theoretically travel into the past is to construct an infinity tube. It’s kind of fitting. In 1974, scientist Frank Tipler proposed a solution to the general relativity equations that would allow for backwards time travel. He theorized a giant, rotating tube in space that was infinitely long in each direction. The rotation of a tube like this is so incredibly taxing on the space-time around it that it would warp it in the same way that a black hole would. Light cones near it would start to tip over. Going back to our diagrams for a second, you can see that if our light cone tips over enough, the path your world line can take doesn’t necessarily have to go forward in time. It can go backwards. If traveling through warp space-time like this can theoretically take you into the past, then there is a path along a Tipler cylinder with all these tipped over light cones where you could go around it and take yourself as far back into the past as you wanted, going around, past, past, past, past. Maybe you’d get far enough back to get the one that got away. Peggy! (exaggerated crying) They danced. Now, though, there’s a problem. If there is a way to curve a world line so much that it comes back around through time and intersects with itself, it forms what scientists call a closed timelike curve. It is timelike, because it is still within the light-speed boundary and events can be casually connected from A to B, Thanos get the Infinity Gauntlet and then he snaps. The problem for the Avengers is is that even if you curve this line to travel back in time, Thanos snapping is still on the world line. It happens some time in the past, and therefore, it has to happen. Thanos is right in this regard, he is inevitable. This principle is known as the Novikov Self-Consistency Principle, saying that whatever happens in this weirdness still has to agree with what happened at all other points on the world line. This gets around the dreaded Grandfather paradox, which is good, but it’s bad for the Avengers, because in this view of reality, if this is the way you are traveling through time, you cannot change the past, period, (exploding) come on! I just got ’em back! If Avengers: Endgame didn’t have a way around all these physics, we’d have to conclude that the movie is fun, but kind of logically impossible. Thankfully, quantum mechanics comes to the rescue once again. Hey, so, you didn’t do it? Butt coward. Have you ever wondered if you could’ve done something differently in your past? What would the world be like if you took a different path through space-time? One interpretation of quantum mechanics says that you did. You did both. You did all of them. Every time you interact with the universe as a quantum system, as you are at this small a scale, you split the universe, each one unfolding with a different history. This is physicist Hugh Everett’s Many-Worlds Interpretation of quantum mechanics and it posits an infinitely branching tree of timelines every time quantum systems interact. You, as a quantum system, have an infinite number of potential world lines, but at our scale, as a collection of particles, we only really observe one path that we’re going down, but all of these paths have some version of you and your history traveling along it. Again, this is all very theoretical, but other scientists, like, most notably, David Deutsch, who Tony Stark name drops in Avengers: Endgame, The Deutsch Proposition, think that if you could travel back in time from your world line and go back to the past, because of quantum mechanics, you would necessarily have to split off, and then travel down some alternate history. This gets around any potential paradoxes, because you can mess with a past that isn’t your own. You can even mess with yourself. You could punch yourself in the face, or get the hammer back from yourself. Still worthy, yes! This gets around time loops and paradoxes, but more importantly, if you were to somehow use quantum mechanics to jump back from your alternate timeline to what you perceived as your own original timeline, you would be, in fact, in a future of your own making, where you could change events in your perceived past, even after punching yourself in the handsome face, so now, I think we are finally ready to address Endgame. Ow, fu… Right, sorry, it gets even more fundamental than this many worlds approach. As we went through in detail in our, is Ant-Man secretly the strongest Avenger episode, we experience our own time as advancing from one point in space-time to the next. Our world line, at least to us, is a single line. If we could figure out a way to travel backwards in time, and we got there to an alternate timeline, like the Many Worlds Interpretation suggests, when we got back in time, we would still experience our own world line in this way, advancing from one point in time to the next. When you go to quantum mechanical scale, though, this solid line reveals itself to be something very different. Literally every single possible path through space-time. This was one of legendary physicist’s Richard Feynman’s many great insights, that a quantum particle takes literally every single possible path through space-time and some of those paths are even, yes, going backwards in time, but when we look at it from our human macro-scale, all we see is this single, most likely world line. We see the grand rope of time, we do not see all the fibers that weave it together. So in the quantum realm, where the Avengers are supposed to go, the path between two points in space-time doesn’t look like this anymore. It would look something like this. Between every two points in space-time, there are an infinite number of quantum paths that would take you between those two points. I represented it here as circles with decreasing density, saying that traveling from one point in time to another, like this, like time travel-wise, would be very unlikely, and the most likely line is the one that we experience through space-time, the straight line. Of course, there would be an infinite number of backwards paths through space-time for a quantum particle between two points in space-time, as well. My point is is that every single point in space and time is linked quantum mechanically. At our scale, you cannot see this infinitude of possible paths, the collection of particles that we are, we only experience the most likely path for those collection of particles, a straight line through space-time. However, if you got down to the quantum scale, you would experience, you would see, everything. The key to all of this is that if you had Ant-Man’s go quantum powers and Tony Stark’s intelligence, you might be able to pick any weird, unlikely world line that you wanted to to take yourself to a very specific, or many specific, points in space-time, say, one out of 14,000,605. I know this is all very, very confusing, and honestly, I haven’t wrapped my head around all of this fully yet. I have spent, for this episode, 10 hours, literally, on a phone with a quantum physicist, but keep all this in mind, keep the analogies in mind, and now, it is time to address what actually happened in Endgame. Here’s how the Avengers: Endgame timeline actually shapes up if they are truly following a quantum mechanical version of time travel. I needed a lot of space. Here is our grand rope of MCU history, a story starting canonically all the way back in the 1940s with Captain America, the first Avenger, and then progressing over 21 different films to the events of Endgame, where somewhere around 2023, the Avengers get time travel, they go back in time, they get the Infinity Stones, they come back, the Hulk snaps, and then Tony snaps, and then people are dusted and undusted, and then Captain America comes back as an old man and makes you cry, yeah. This is too simple, though, for this film, and for quantum mechanics, so now, let’s see if we can unravel this rope to see what quantum fibers the Avengers took, in terms of world lines, to do what we see them do in the film. Using the infinitude of possible quantum paths, here’s what the Avengers actually do. In 2017, when Infinity War is supposed to take place, there is a snap. There’s a five year time jump, and then, there is time travel. From that point, they use the powers of the quantum to take these unlikely world lines back to 2012, 2013, and 2014. From there, they each have their separate missions to grab the different stones, eventually, all returning back to this point, while Cap and Tony travel back to the 1970s to grab the Tessaract after it falls out of their hands and into Loki’s hands, ah, I wonder what happened with him, we don’t know, and then they also grab more Pim particles. They also jump back in the same amount of time. A brief amount of time later, Thanos, an alternate version of Thanos, and an alternate version of Gamora and Nebula, both jump back to this original world line. From there on, Hulk snaps, and then, Tony snaps, and the movie is more or less over until Captain America returns all the stones. First to 2014, and this is just my interpretation, because it would look pretty and made more sense, first to 2014, and then jumping back to 2013, 2012, 1970 to return the Tessaract, and then to the 1940s to take an unlikely alternate world line with the power of the quantum to live out a full life with Peggy, where things may or may not have happened in the MCU, we’re not really sure, and then he returns as old Captain America. This is a lot, so you might want to pause your video to get a handle on it. Remember, these are only the various paths the Avengers chose to take using the power of the quantum. In reality, there are literally an infinite number of paths to and from each point on this grand rope of MCU history, from 2012 to 2023, for example, and from 1940 to 1940 plus five seconds and back again, and remember, this is just my quantum mechanical interpretation of what’s going on. The timeline of events in some Marvel production office might look very different; however, this approach does theoretically get around all of the closed time-like curve and potential paradox problems. I applaud the movie for bringing in quantum mechanics and acknowledging the problem with closed time-like curves. If this was just a single timeline, for example, there would be a lot of problems, like future Nebula shooting herself from the past. That would be Back to the Future stuff, and you know what the Hulk thinks about that. Quantum mechanics is really the only way that this works, because if you could get to the smallest, smallest scales of the universe, where an infinite number of branching paths through every point in space-time were open to you, you could metaphorically choose your own adventure. You could pick the one out of 14,000,605 world lines and live it as your own history and change your future. From our perspective, our non-quantum perspective, observing all this happen, it would all be the same story. The same endgame. There you have it. 10 years of the MCU culminates in a surprising way, with the quantum physics of time travel, of all things, and much of the movie works theoretically if you give it the biggest possible benefit of the doubt, which I think we can do. There is inherent tension in any sci-fi story, and especially in time travel stories, between the narrative that you’re trying to tell and the science that you’re trying to get right, and sometimes one features more than the other, and that’s fine. Endgame was very satisfying for me, and in all seriousness, the MCU has been helping me learn and teach and excite for my entire career, so thank you, Marvel. Your movie was pretty dang cool. So here’s to another 10 years of, and because, science. (electronic music) Hmm, I wonder if there’s any footage I could show of any kind of science show that maybe, I don’t know, a year ago predicted the exact mechanism of how Avengers: Endgame would happen, with the exact right characters? Could we find any footage like that? This is potentially a way to save half of the universe. Hm, hm, (clapping) validated! You live life in the past? It’s weird I know, but even right now– Whoa, wrong timeline. Thank you so much for watching, Jonathan, and a big thank you to Doctor Spiros Michalakis at the Institute for Quantum Information and Matter, a good friend of mine who actually advised on films like Ant-Man and Spider-man and Captain Marvel. He talked with me for hours about how to make this kind of time travel work, so thank you so much, my friend. I hope I didn’t bother you too much. Also, we have the full series of the Science of Mortal Combat now live. Please go watch all six main episodes, we worked really hard on them, and I’m glad that many of you are enjoying them. I very much hope to do something like that again for you all very soon. If you wanna follow us on social media, you can do so right here to give us ideas for future episodes, and thanks. (beeping)

100 thoughts on “The Avengers: Endgame Timeline Explained (Spoilers)

  1. Thanks for watching Super Nerds! This was by far the hardest I’ve ever had to think about a script, literally hours on the phone with a quantum physicist, but I’m happy with the result. I think we understand the timeline more than the writers or Russos do now! See you in Footnotes. — kH

  2. If you travel to the past, that past becomes your future, and your former present becomes the past which can't now be changed by your new future.

  3. Caps world line doesn't add up. When he 'returns' to Tony's house after they sent him back it is assumed he just lived out his life and meet then them there. He never used the quantum weirdness to come back. Therefore, he shouldn't exist…at least not that version of him. When he goes back and lives out his life with Peggy he would create an alternate timeline and not meet up with the versions of his friends he is familiar with…maybe. Not quite sure… my head hurts a little from thinking about this. All I know is Cap really is a man out of time..

  4. There were two gems that could effect the out come of Thanos plan. One was the gem of time and the other was the reality. Since time is a thing like say a glass and reality is a thing such as water. One would not have to change time but the reality of by what fills it. This I assume the world line. The world line is not an absolute of time but simply that reality that fills it. So all you would have to do is change the perception of world not the time by which it is contained in. Otherwise just put something new in the water.

  5. I know no-one will believe me… but i figured out how everyone would be saved in endgame… right after Ant-man came out… Like i said, i know no-one will believe me… but after that movie came out, i actually figured that Scott could use his quantum powers to travel space and time since they're both inter-twined… i actually made a little (poorly made) video about it that i might've shared to my friends on facebook… but yeah., i was pretty pumped when it all worked out like that

  6. If i were to travel back in time would i become the same age as i was at the moment i travel back to or would i be the same age as now. Because at 12:21 he says how if you go back you would be forced to travel down a different world line. So please someone explain.

  7. So they can go in the past bringing back every dead character, I don't find any paradox on it.
    Marvel: "meh, acting contracts are more complicated than quantum physics, just let's tell them that the recasted red skull dude said that those deaths are irreversible."

  8. I want to know what happens in each new timeline. Loki grabs tesseract what happens to that tume line tohor steals hammer from self somehow (what if his other self called the hammer back would it just be stuck in the middle. Or, did it happen when he wasn't worthy? 😉 Star-lord never meets gramora captain America doesn't end the war? (Not sure about this ine since it technically happens first even though it happens last?) I wonder if any of them cares that they made a bunch of new timelines which results in the end of more lives than thanos' original snap? Or do the all the new timelines even matter? Well except the timline we see is actually a branch of the original (obviously because the snap already happened in the original or mayby the whole multiverse got deleted?) 🤯

  9. why didn't they just steal from themselves if it didn't affect their timeline?

    edit: the pym particles, aside from stakes

  10. many world theory is basically a lazy way to write a time travelling story, this is also why I dont like End Game time travel… plus with multiple alternate timeline, there is no reason to persevere the timeline which is the core of any time travelling story… so in other word, there is no reason for the avenger to return the infinite stone..

  11. Isn't the problem that they're not actually fixing their own timeline? If you travel back in time, creating an alternate universe, you're not really fixing your universe's problem. Half of the universe is still dead in the universe you started in.

  12. How is it, that going faster than light is IMPOSSIBLE, but wormholes is A-okay? If the speed of light generates an infinite mass, won't a wormhole then demand an infinite amount of energy. And won't it rip apart anything that goes through it?

  13. I do think that the MCU uses the Quantum theory of time travel, which definitely doesn't appear in media nearly as often as the "grandfather paradox" theory of time travel… But those are not the only two theories on the topic. I find the version where the universe is apathetic to be the most realistic.

    Basically, this version of time travel removes events that happened as you go back. You have memories of some of those events, sure, but the universe ceases to. As far as the universe knows, you just spontaneously existed. Memories are simply stored data, and data doesn't have to be accurate. (This doesn't match the movie, because the effects of each historical change would compile forwards with each of the forward jumps.)

    The short version: In theory G, you can't shoot your grandfather because time stays consistent. In theory Q, if you shoot your grandfather, you create a new timeline branch. In theory A, if you shoot your grandfather, the future changes and all your memories are of things that won't happen that way.

    From pure observation, it would be impossible to tell the difference between theories Q & A if A is correct, but if Q is correct, trans-dimensional travel could be possible and would disprove A.

    I happen to believe that A is the most likely. It feels the simplest to me, but I can see that Q is also a possibility. Theory G feels like the most complex theory of the three, as the universe would have to expend energy into preserving its own consistency, which I think fails Occam's Razor.

    It was nice to see a more realistic interpretation of time travel in media for once.

  14. ok, now I like endgame more =) wasnt so happy about time travel thing, but now its ok =) thank you! =)

  15. Wouldn't "Z" actually be the depth, or, the perception of depth through a given space, starting at the viewers position, all across said space, "ending" at any given "point" across the horizon line(this one still in relation to viewers position)?

  16. Amazing video. Noticed that (bar from the 2017 slip-up you corrected) there was one glaring mistake (though it only has to do with the Avengers timeline itself and not the actual science behind it). You confused the events of 2013 and 2014 in the MCU. If you recall, Ebony Maw makes a comment about Future!Nebula being from 9 years in the future. Assuming that Infinity War takes place in 2018 and that it was a 5 year time-jump to 2023, 9 years before 2023 would be 2014, meaning that War Machine, Nebula, Black Widow and Hawkeye are the ones travelling back to 2014 (not Thor and Rocket) to get the Power and Soul Stones.

    Additionally, since the MCU movies (bar from most of Captain America: First Avenger, Captain Marvel and Avengers: Endgame itself) seem to be set in the years of the film's release, we can infer that, since Guardians of the Galaxy was released in 2014 and Thor: The Dark World was released in 2013, the retrieval of the Aether/Reality Stone is in 2013 and vice versa. Nothing major, just a little event confusion that I noticed. Understandable since we're dealing with time travel.

  17. If their are infinite possible paths and you branch off from, does that mean that they actually returned to their original timeline? Or is there an abandoned timeline where the snap still happened and it's hero's left it to save themselves with a new timeline?

  18. so what would happen if you went back in time then reversed time, would you go back to the starting point before you went into the past?

  19. So in Infinity Wars, Dr.Strange explores 'all possible outcomes' and gives us the 14,000,605. But since all things happen in a quantum universe. This means that number is FALSE. Next. In order for Dr.Strange to travel/look through time as you explain in this video then we have to 'assume' that the TIME STONE is a QUANTUM stone. In Dr.Strange (movie) creates a time loop when fighting with Dormammu. This means he has the capability to travel backwards in time. So in the MCU there are 2 ways to currently travel to any point in time. With Ant Man in the Quantum Level and with the Time Stone from Dr. Strange. Both have to work on the same principles. Quantum Mechanics.

  20. It would of been better if Doctor strange sent the time stone into the future for the surviving avengers to use the stone to find the other stones, the quantum tunnel thing could of worked just with the time stone powering it maybe

  21. Many worlds interpretation wouldn't even work like this. but again it is kind of a broad pseudoscience interpretation of quantum mechanics.

  22. Kyle . I love watching your videos… U make me laugh in every one. Keep up the great work. Your are totally STILL WORTHY.

  23. I've thought about the "many-worlds interpretation" thing, but personally interpreted it as multiverse, due to the timeline spliting and it causing multiple universes

  24. How did nebula make the return trip and also have enough pymm particles to bring through thanos and his ship, crew etc.

  25. Is it safe to say that time travel in dragon Ball is same as endgame?
    Trunks came back to the past but it doesnt change his timeline rather creating new reality.

  26. Anyone else watched Interstellar and understood 20% of the video just from that? (And the rest from several other shows and games and Endgame itself) xD
    But yes, I loved how the quantum science actually made sense, the MCU have been incredible in making fun and relatively reasonably logic-ed movies, wish my dad understood, he said it was a bad movie because it didn't make sense and I spent 30mins trying and failing to explain it to him, mostly because he wasn't actually listening but trying to write an email. Sheesh dad, I only see you like once a month x'D
    And who else had to pause the video to laugh at the Starkbucks line he dropped out of nowhere?

  27. There's also the causal version of time travel, but then you couldn't get time copy duplicates and the mere act of traveling back in time would create a butterfly effect of change

  28. I have one BIG science problem with endgame: Capt. Marvel carrying Tony's ship back to earth..

    In Tony's own words, he was 1000 light years from home, and oxygen runs out the next day.
    (Then he falls asleep)

    So Captain Marvel carries the spaceship on her back 1000 light years in a few hours? Thats exactly 8,766,152 x the speed of light to travel 1000 lightyears in 1 hour, or 1,000,000x the speed of light to do the trip in 8 hours 45min 58sec.

    I get, maybe that she can withstand that kind of force and breaks the laws of physics, but Tony did NOT survive this.

  29. One thing I dont get is if Thanos time jumps from 2014 to 2023 (or whatever year it is when he appears), there is no Thanos present in the timeline between these two years, because he doesn't get back to 2014. How does he collect the stones and make the snap? Is this really the reason why half of the universe is alive after Hulks snap.
    Not because Hulk snapped and undid it, but because Thanos in the same moment abandoned that timeline where he would make the snap…

  30. Does this means that Everyone who is traveling through time is Just changing their world line and just living in another world line and being selfish …??????!!!!!!!!!!!!!!!!!

  31. Wouldn't if cap went back in time to live with penny wouldn't his existence have created its own branch as the anchient said ergo old cap wouldn't have been in the end of the movie? Cus he would have been in another branch?

  32. I love to see you tackle the OA from Netflix. I wonder if this science has a lot of stuff to do with that science. Alternate dimensions and realities and all that.

  33. What are the odds that the rat step on that button in all of 14,000,605 possible outcomes in Avengers: Endgame? Find out as the Film Theorists have calculated this here:

    https://youtu.be/vImyXlST6g0

  34. Year: 2012. Someone is breaking into your house. You have a handgun on your dresser. You shoot the dude. You go to court yada yada you're set free after a huge hassle. Two years later you can time travel. If you go back and take the gun, the second you return you could be injured from that day or worse. However, you go back and knock him out before he breaks in, you would not have to deal with the court and other BS.

  35. My thoughts are if matter cannot be created or destroyed, how does time travel create a whole universe filled with the same matter purely by changing if you had a hamburger instead of steak or you zigged insteadof zagged?

  36. But the Avengers didn't change the past, they stole from the past in order to fix the present. This creates the multiverse, & puts the future in peril, but they'll fix these problems in 2022.

  37. Because science could you explain how professor hulk can’t exist indefinitely? He should have reverted due to his multiple personalities ie different hulk personas as comically written about! Why? Because neuroscience lol

  38. I have a question….
    I think I understood the quantum mechanics of time travel with the infinite time paths….
    But by that theory if you travel back in time and change one decision (example in a road trip instead going right say to your version to go left ) and go back to the future you won't be on the alternate time path instead of your own time path?

  39. A bit more of a serious point:
    You explained the whole Timeline confusion how they undid Thanos killing of half the Population of … well the Universe aparently. But if you take a more realistic view, would you even want to do that after 5 years have passed?
    I can think of quite a few reasons NOT to. Looking at earth only (since outside Marvelverse we don't know anything about other places) … that probably would prevent further climate change for one. Also people have been living for 5 years, a lot of people should be over their personal grief by now, found new partners etc. Just imagine how many babies would have been born in the 5 years that now .. what? Never existed?

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