This article contains information that could be considered potential spoilers for Thor: Ragnarok. There aren't any specific details, but you could infer something. If you want to stay spoiler-free, this might be a good one to skip.

Captain America: The Winter Soldier is one of the best Marvel movies so far — but it also did something that no one was really expecting: it broke down a part of the MCU and didn't bother to rebuild it. We learned in Winter Soldier that S.H.I.E.L.D. was compromised, which had huge ramifications for the entire universe. Ragnarok producer Brad Winderbaum explains to Screen Rant that this entry of the Thor movies is similar in that they are breaking down part of the Cosmic Marvel universe — and there are going to be consequences:

"In Winter Soldier we broke down some of the real fundamental ideas about the MCU that you took for granted, specifically S.H.I.E.L.D.. I think that also in phase one, we established this cosmology that involved Asgard and Odin, and certain ideas of things that you just thought were eternal and could never change. And what this film does is it breaks them down in a very similar way [to how] Winter Soldier broke down S.H.I.E.L.D. Much like Winter Soldier took a lot of ideas off the playing field to make it harder on the Avengers in Ultron, [Ragnarok is] a similar thing. The whole cosmic world of the MCU was… you had Thanos, and you had Chitauri, and you have threats from above coming. But you also have Asgard, you also have these protective forces out there too… we make it much harder for those protections to come help our heroes as we enter [Avengers 3]."

It sounds like we're really going to see the destruction of Asgard — perhaps almost entirely. If nothing else, we're going to see it weakened so badly that it must focus on itself and isn't able to help the rest of the universe when something like Thanos comes along. The Avengers have lost their allies in S.H.I.E.L.D., and now they've lost their allies on Asgard.

Summary: Imprisoned, the mighty Thor finds himself in a lethal gladiatorial contest against the Hulk, his former ally. Thor must fight for survival and race against time to prevent the all-powerful Hela from destroying his home and the Asgardian civilization.

Thor: Ragnarok, directed by Taika Waititi, stars Chris Hemsworth, Tom Hiddleston, Cate Blanchett, Jeff Goldblum, Idris Elba, and Mark Ruffalo. It will be released on October 24th in the UK and November 3rd in the US.