<P> 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 ingratiated himself . Thor recognizes 142 as one of the Valkyrior, a legendary force of female warriors who were killed fighting 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 . </P> <P> 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 . 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 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 the remaining Asgardians in pursuit of the sword that controls the Bifröst . Banner becomes Hulk again, defeating Fenris, while Thor and 142 battle Hela and her warriors . Loki and the gladiators arrive to rescue the citizens . A repentant Skurge sacrifices himself to enable 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 . He sends Loki to retrieve Surtur's crown and place it in the Eternal Flame . Surtur is reborn and destroys Asgard, seemingly killing Hela . </P> <P> Aboard the Grandmaster's spaceship, Thor, now 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 is confronted by his former subjects . </P> <Ul> <Li> Chris Hemsworth as Thor: The crown prince of Asgard based on the Norse mythological deity of the same name, who has become a "lone gunslinger" searching for the Infinity Stones . Hemsworth had become "a bit bored" with the character after portraying Thor four times previously, and wanted to take some risks and experiment: the character has shorter hair in the film, wears a different outfit, his hammer Mjolnir is destroyed, and he loses an eye . Director Taika Waititi added that "stripping" the character down like this allowed him to become a refugee at the end of the film . Waititi also wanted to use more of Hemsworth's comedic talents showcased in films like Vacation (2015) and Ghostbusters (2016), and cited Kurt Russell's portrayal of Jack Burton from Big Trouble in Little China (1986) as an influence on the character . </Li> <Li> Tom Hiddleston as Loki: Thor's adoptive brother and nemesis based on the deity of the same name . Hiddleston was interested in how Loki's attitude has changed, saying, "he is always a trickster . It is trying to find new ways for him to be mischievous". As the ruler of Asgard since the end of Thor: The Dark World (2013), Hiddleston notes that "Loki has devoted most of his efforts to narcissistic self - glorification . Not so much on good governance ." He also added that "the idea that Thor might be indifferent to Loki is troubling for him...it's an interesting development ." </Li> <Li> Cate Blanchett as Hela: Thor's older sister and the goddess of death, based on the deity Hel, who is inadvertently released from prison . Screenwriter Eric Pearson included the idea of Hela being Thor's sister in one of his drafts at the encouragement of executive producer Brad Winderbaum . The decision to make Hela related to Thor, as opposed to Loki as in the comics and Norse mythology, came from needing more impact with Hela and Thor's final confrontation . By making the change, Pearson felt Hela became "the thing that (represents) what it is to rule Asgard, (Thor's) family, what he's been told, what he hasn't been told ." Blanchett found it difficult to portray the character in a motion capture suit rather than costume, feeling Hela's headdress is "such a huge part of" the power of the character that she would have liked to wear it on set . Hela's design was taken from the comic Thor: God of Thunder by Jason Aaron, while the character Gorr from that comic, who has the ability "to manifest an infinite number of weapons", inspired a similar ability for Hela . Blanchett worked with stuntwoman Zoë Bell and Hemsworth's personal trainer Luke Zocchi, and studied capoeira for the role . </Li> <Li> Idris Elba as Heimdall: The all - seeing, all - hearing Asgardian former sentry of the Bifröst Bridge, based on the deity of the same name, who has gone into self - imposed exile during Loki's reign . After Hela invades Asgard, he helps to hide its vulnerable citizens . Describing Heimdall's character arc in the film, Winderbaum says, "he's gone from this elder statesmen, the gatekeeper to Asgard, to this badass warrior - wizard character who lives in the hills and kicks a lot of ass throughout the entire film ." </Li> <Li> Jeff Goldblum as Grandmaster: One of the Elders of the Universe, who rules the planet Sakaar, and enjoys manipulating lesser life - forms . Goldblum described the character as "a hedonist, a pleasure - seeker, an enjoyer of life and tastes and smells". He also said that Waititi encouraged improvisation in order for Goldblum to "make (the character his) own". Waititi explained that Grandmaster does not have blue skin in the film as the character does in the comics, because Goldblum had already played a blue - colored character in Earth Girls Are Easy (1988), and because Waititi did not want to detract from Goldblum's personality by concealing his appearance . Grandmaster is the brother of Benicio del Toro's Collector from Guardians of the Galaxy (2014), and producer Kevin Feige expressed interest in seeing the two together in a future film . </Li> <Li> Tessa Thompson as Scrapper 142 / Valkyrie: A tough, hard - drinking Asgardian slave trader, based on the mythological being Brynhildr, who was once a legendary warrior of the Valkyrior and now works for the Grandmaster under the designation "Scrapper 142". Thompson said the various versions of the character from the comics "left us a lot of leeway" in creating the film version . Waititi "wanted to make sure we weren't making a female character that was boring and pretty", and Feige said Marvel wanted to pair Thor with a love interest more his equal than Jane Foster . Co-screenwriters Craig Kyle and Christopher Yost's original draft of the film had more of a romantic relationship between Thor and Valkyrie . When Pearson started working on the film, he moved away from that storyline, instead focusing more on "the mutual respect" between the characters and Valkyrie "dealing with her PTSD . She's someone who's drowning her sorrows in the bottle, and I just thought that was such a cool thing that you don't often see". Thompson stated that the character is bisexual, which she based on the character's comic book relationship with Annabelle Riggs, and convinced Waititi to shoot a glimpse of a woman walking out of Valkyrie's bedroom which was later cut from the film as Waititi thought that it distracted from the scene's exposition . Thompson was inspired by pictures of Linda Hamilton as Sarah Connor in Terminator 2: Judgment Day (1991) while training for the role, and worked with dialect coach Andrew Jack to create an Asgardian - sounding accent that was different enough to sound like she had been away from there for a long time . Thompson will appear in future MCU films . </Li> <Li> Karl Urban as Skurge: An Asgardian warrior, who guards the Bifröst Bridge in Heimdall's absence and chooses to join Hela to survive . Urban shaved his head for the role, and worked out to "get into the zone and feel" the part even though his body is hidden under a costume . Urban said Skurge "makes a deal with the devil" and becomes Hela's "henchman . He does the dirty jobs . And that sort of is something he has to--it plays on his conscience ." </Li> <Li> Mark Ruffalo as Bruce Banner / Hulk: A genius scientist who transforms into a monster when enraged or agitated, after being exposed to gamma radiation . In the two years since Avengers: Age of Ultron (2015), he has become a successful and popular gladiator on Sakaar, and has suppressed the Banner side in those years . He is forming the vocabulary "of a toddler", with the level of Hulk's speech being "a big conversation" between Waititi and Marvel since it was taking into account future appearances for the character: Ragnarok begins an arc for the character that continues in Avengers: Infinity War (2018) and its untitled sequel (2019). Ruffalo felt Hulk had "a swagger" in the film, and was "much more of a character than the green rage machine" seen in the Avengers films . Waititi provided additional motion capture for the Hulk after Ruffalo had completed his scenes . </Li> <Li> Anthony Hopkins as Odin: The king of Asgard, father of Thor and Hela, and adoptive father of Loki, based on the deity of the same name . The character is in exile on Earth, and was originally intended to be a "crazy - looking" hobo on the streets of New York City, but Waititi ultimately felt that this was tragic rather than funny given the character's death during the sequence . The sequence was changed to take place in Norway, to "honor" the character's past and be more authentic to his role as a king of Asgard . Waititi was surprised by the improvisational ability of Hopkins after he was told "to be funny and to really destroy what's come before (with the role) and recreate it ." </Li> </Ul>

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