Thor: Ragnarok is a 2017 action adventure film starring Chris Hemsworth, Tom Hiddleston, Cate Blanchett, Idris Elba, Jeff Goldblum, Tessa Thompson, Karl Urban, Mark Ruffalo and Anthony Hopkins, directed by Taika Waititi, written by Eric Pearson, Craig Kyle and Christopher L. Yost, based on the comics by Stan Lee, Larry Lieber and Jack Kirby and produced by Kevin Feige.
Two years after the battle of Sokovia, Thor has been unsuccessfully searching for the Infinity Stones, and is now imprisoned by the fire demon Surtur in Muspelheim. Surtur reveals that Thor's father Odin is no longer on Asgard, and that the realm will soon be destroyed in the prophesied Ragnarök, once Surtur unites his crown with the Eternal Flame that burns in Odin's vault. Thor defeats Surtur and claims his crown, believing he has prevented Ragnarök.
Thor returns to Asgard to find his brother Loki posing as Odin. Thor forces Loki to help him find their father, and with directions from Stephen Strange on Earth, they locate Odin in Norway. Odin explains that he is dying, and that his passing will allow his firstborn child, Hela, to escape from a prison she was sealed in long ago. Hela had been the leader of Asgard's armies, and had conquered the Nine Realms with Odin, but she had been imprisoned and written out of history after Odin feared that she had become too ambitious. Odin subsequently dies, and Hela, released from her imprisonment, appears. She destroys Thor's hammer Mjolnir, and when Thor and Loki attempt to flee through the Bifröst Bridge, she pursues them and forces them out into space to die. Hela arrives in Asgard, destroying its army and killing the Warriors Three. She then resurrects the ancient dead who once fought with her, including her giant wolf Fenris and appoints the Asgardian Skurge as her executioner. Hela plans to use the Bifröst to expand Asgard's empire, but Heimdall covertly steals the sword that controls the Bridge, and hides away with the rest of Asgard's citizens.
Thor crash-lands on Sakaar, a garbage planet surrounded by wormholes. A slave trader designated Scrapper 142 subdues him with an obedience disk and sells him as a gladiator to Sakaar's ruler, the Grandmaster, with whom Loki has already become ingratiated. Thor recognizes 142 as one of the Valkyrior, a legendary force of female warriors who were killed defending Asgard from Hela long ago. Thor is forced to compete in the Grandmaster's Contest of Champions, facing his old friend Hulk. Summoning lightning, Thor gets the upper hand on Hulk, but the Grandmaster sabotages the fight to ensure Hulk's victory. Still enslaved, Thor attempts to convince Hulk and 142 to help him save Asgard, but neither is willing. He soon manages to escape the palace and finds the Quinjet that brought Hulk to Sakaar. Hulk follows Thor to the Quinjet, where a recording of Natasha Romanoff makes him transform back into Bruce Banner for the first time since Sokovia.
The Grandmaster orders 142 and Loki to find Thor and Hulk, but the pair come to blows and Loki forces her to relive the deaths of her fellow Valkyrior at the hands of Hela. Deciding to help Thor, she takes Loki captive to prove her goodwill. Unwilling to be left behind, Loki provides the group with the means to steal one of the Grandmaster's ships. They then liberate the other gladiators who, led by Korg and Miek, stage a revolution. Loki attempts to again betray his brother to gain a reward from the Grandmaster, but Thor anticipates this and leaves him behind, where Korg and the gladiators soon find him. Thor, Banner, and 142 escape through a wormhole to Asgard, where Hela's forces are attacking Heimdall and Asgard's citizens for the sword that controls the Bifröst. Banner becomes Hulk again, defeating Fenris, while Thor and 142 battle Skurge and the resurrected warriors. Loki and the gladiators arrive to help, and the citizens board their ship; a repentant Skurge sacrifices himself to allow their escape. Thor, facing Hela, loses his right eye and then has a vision of Odin that helps him realize only Ragnarök can stop her. While Hela is distracted, Loki locates Surtur's crown and places it in the Eternal Flame. Surtur is reborn and destroys Asgard, seemingly killing Hela.
Thor and the others escape with Asgard's remaining citizens aboard the Grandmaster's vessel. Thor, crowned king, decides to take his people to Earth. In a mid-credits scene, they are intercepted by a large spacecraft. In a post-credits scene, the Grandmaster encounters a group of his former subjects, who are still rebelling.
- Chris Hemsworth as Thor
- Tom Hiddleston as Loki
- Cate Blanchett as Hela
- Idris Elba as Heimdall
- Jeff Goldblum as Grandmaster
- Tessa Thompson as Scrapper 142 / Valkyrie
- Karl Urban as Skurge
- Mark Ruffalo as Bruce Banner / Hulk
- Anthony Hopkins as Odin