Surtur

The last time we saw Thor, he was working to discover more about the Infinity Stones at the end of Age of Ultron. Now, he finds himself without his goldilocks, but he’s ready to fight Hulk in the arena.

The teaser trailer begins with Thor in chains. More importantly, the scene takes place before his arrival on Sakaar (he still has his long hair). So what is he doing there? We can assume that he is visiting other realms as he searches for answers. In this case, he’s in Muspelheim, a world of eternal fire. If we look closely, we can see some giant fiery faces.

This could be Surtur’s introduction, but if it happens at the beginning of the movie, will he be defeated before Hela even makes an appearance? If so, it could be a bit disappointing, especially since Surtur used his Twilight Sword to start the Ragnarok in the comics.

Of course, this is just speculation. We can further speculate that Hela wields said sword when she goes up against the Asgardians, and that the Soul Stone grants her the power to obliterate Asgard, and so on.