In addition to losing his trusty hammer Mjolnir to the massive power of Cate Blanchett's Hela, the events of Thor: Ragnarok will change the God of Thunder in a lasting way.
"This will be the story Marvel can never go back from," director Taiki Waititi told Screen Rant during a visit to the anticipated sequel's set. While Ragnarok traditionally means the end of everything, in the context of the film it means disassembling what's already there, and rebuilding it. "We do a lot to this character in this film... But in a way where what comes out the other end is way more exciting and interesting."
Whatever this means, it certainly has to do with Hela and her mission to destroy all the gods of Asgard. We know that Thor will be found by the Guardians of the Galaxy in Avengers: Infinity War, of course, but what leads him to that point and what his state of mind is when they meet remains to be seen.
Arriving Nov. 3, Thor: Ragnarok stars Chris Hemsworth as Thor, Tom Hiddleston as Loki, Cate Blanchett as Hela, Idris Elba as Heimdall, Jeff Goldblum as Grandmaster, Tessa Thompson as Valkyrie, Karl Urban as Skurge, Mark Ruffalo as Bruce Banner/the Hulk and Anthony Hopkins as Odin.