Thor is imprisoned in a cage on a Hell-like world. A fiery demon creature explains to him how he's going to bring Ragnarok-the apocalypse-to Asgard, but Thor defeats him and takes his skull for safe-keeping back to the city. But he's been away for a while-and realizes that Odin is really Loki in disguise. He confronts his wily brother and together they embark to Earth to find Odin (Anthony Hopkins) on a desolate area of Norway. He tells them he's dying-and a threat is coming. This threat his Odin's first-born, Hela (Kate Blanchett), the Goddess of Death. The two brothers fight her but she's powerful-and actually crumbles his hammer. So they call for help to take them back to Asgard. But she tags along and throws them out of the gateway, so they're lost on a far-off planet while she makes it to the golden city to begin her take-over.
Thor again finds himself imprisoned and is forced to fight in an arena for the Grandmaster (Jeff Goldblum). Here, he sees his opponent is none other than the Hulk. They fight but Thor is knocked unconscious by a device from the Grandmaster. He and Hulk catch up-and escape from the planet with the help of the last Valkyrie (Tessa Thompson) along with a group of aliens, including the rock-like Korg. Meanwhile, Hela has all but taken over Asgard by the time they get there, which leads Thor to make an extremely important decision.
This is definitely the best-and most fun-of the THOR movies so far, building upon the events in previous films as well as THE AVENGERS movies. Plus, Hela makes a formidable villain. And I think the aftermath of the events in this film will have an affect on all the other Marvel series, even the television shows. Highly recommended.