The timeline of the Marvel Cinematic Universe can be a little confusing. Director Taika Waititi shared a video that showed us where Thor (Chris Hemsworth) and the Hulk (Mark Ruffalo) were during the events of Captain America: Civil War — but it turns out they weren't hanging out with some dude named Darryl, to the shock of everyone. During a set visit, /Slash managed to get the scoop about what Thor was doing during that time.
"For all the fans who have been wondering why Thor wasn't around to get involved with the skirmish in Captain America: Civil War, the events of Thor: Ragnarok hold the answer. When we catch up with Thor at the beginning of the movie, he's been away on his own for two years, but he hasn't been sulking. Instead, he's been trying to track down the puppet master behind some of the recent near-world-ending events, and looking for the Infinity Stones in order to prevent the doomed future he saw for Asgard and his people in Avengers: Age of Ultron. This has sent him across the cosmos on a number of adventures that have branched off from his original quest.
Unfortunately for Thor, despite these adventures making him a much more confident traveler of the galaxy, with Earthly sarcasm to spare, his latest endeavor has found him captured in Muspelheim, one of the Nine Realms of the universe, ruled by the fire god called Surtur. We've seen Surtur in a quick shot from the end of the most recent Thor: Ragnarok trailer with Hulk jumping toward the massive, fiery, horned god, but that's a sequence that isn't part of Thor's entanglement in Muspelheim early on in the movie, and is likely part of the climax in some capacity."
What is the Marvel Cinematic Universe version of Muspelheim? We have that information as well:
"As glimpsed in the Thor: Ragnarok trailer, Muspelheim is very fiery and dark, looking very much like Mount Doom. Production designer Dan Hennah explained even more about the design of the realm, saying that it was essentially a Dyson sphere, a cosmic entity that completely encompasses a star and captures most or all of its power output. Muspelheim has been drawing power out of a dying star for a long time now, and that's what keeps the dragons and demons who live in this realm energized."
The interesting thing about this information is the fact that we see the Hulk fighting Surtur. If the scenes in Muspelheim take place at the beginning of the movie, then does Hulk help Thor escape? Then why does he act surprised when he ends up facing Hulk in the Grandmaster's fights as if he's seeing him for the first time? Hopefully, that scene wasn't just shot for the trailer, because it has one of the best lines we've seen from the film so far:
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.