@boatorious: To be clear, my issue with the time travel in Endgame isn't that it makes less sense than other time travel movies; it's that the movie insists that their way is the REAL time travel, but then sort of ignores any problems that might come about because of that. Instead of just having time travel, the movie tries to act smarter or more realistic than over time travel movies.
I was thinking about this, because I actually read another interview with the Russos, who added the "bagging on Back to the Future" specifically because test audiences kept thinking Endgame was using Back to the Future time travel rules and getting confused haha.
In fact, thinking more about it, the idea that time travel creates parallel universes might be more problematic than if they had done it Back to the Future style. If changing the past creates an alternate timeline, an obvious question is "how much change causes a new timeline to form?" There isn't some arbiter of what change is significant and what isn't, and because of the Butterfly Effect there's no way to know which changes will have an impact and which won't, so the only answer is that ANY time travel creates a parallel timeline.
Banner's line before they travel is that they don't want to create a lot of "nasty" alternate timelines -- which could be taken to mean they know they'll create alternate timelines, they just don't want them to be "nasty". The Ancient One talks about preserving her "reality", as if Hulk just showing up has splintered hers off from his.
But, if that's the case, then when the Avengers did their whole time heist, it means they created THREE alternate timelines--one for every different year they jumped to. In that case, while Thanos is dead in one version of the past, he's still alive in the other two versions, and in one of these versions, Loki has the Space Stone, which causes a whole bunch of issues. Plus, when Tony and Cap go back again to the 50s, this creates a fourth alternate timeline. So, in summary, this means that by saving their universe, the Avengers have created four alternate universes, at least one of which is possibly doomed to Thanos winning? (since Loki gets the Space Stone, and is working for Thanos, we can assume that Thanos gets the Space Stone far sooner in that universe) That feels... bad.
Yup. And that's assuming there's a way for Cap to go specifically back to the altered timelines and not create new branches.
As for Loki and the space stone, I have a weird thought about that.
At the end of the movie, the movie makes a big deal of Sam and Bucky being with Cap, and Cap passing the shield to Sam. This is a big deal in the MCU, but it's also a setup for the rumored Disney+ show about Sam and Bucky.
Guess who else is getting a Disney+ series?
Also, I'm confused about how time travel works in terms of machinery. At first, it looks like the big machine is used to send them back to the past, and the wristwatches return them to the present; but, Tony and Cap use the wristwatches to go back further in time. Why have the big machine then? What purpose does it serve?
Yeah, there are a lot of little things that don't make sense and that's definitely one of them.
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