Plot

When the Dark Elves attempt to plunge the universe into darkness, Thor must embark on a perilous and personal journey that will reunite him with doctor Jane Foster.

Thousands of years ago, a race of beings known as Dark Elves tried to send the universe into darkness by using a weapon known as the Aether. Warriors from Asgard stopped them, but their leader Malekith (Christopher Eccleston) escaped to wait for another opportunity. The warriors find the Aether, and since it cannot be destroyed, they try to hide it. In the present day, Jane Foster (Natalie Portman) awaits the return of Thor (Chris Hemsworth), although it has been two years since they last saw once another. In the meantime, Thor has been trying to bring peace to the nine realms. Jane discovers an anomaly similar to the one that brought Thor to Earth. She goes to investigate, finds a wormhole, and is sucked into it. Back on Asgard, Thor wishes to return to Earth, but his father, Odin (Sir Anthony Hopkins), refuses to let him. Thor learns from Heimdall (Idris Elba), who can see into all of the realms, that Jane disappeared. Thor then returns to Earth just as Jane reappears. However, when some Policemen try to arrest her, an unknown energy repulses them. Thor then brings Jane to Asgard to find out what happened to her. When the energy is released again, they discover that when Jane disappeared, she crossed paths with the Aether and it entered her. Malekith, upon sensing that the time to strike is now, seeks out the Aether. He attacks Asgard and Thor's mother Frigga (Rene Russo) is killed protecting Jane. Odin wants to keep Jane on Asgard so that Malekith will come. Thor disagrees with his plan, so with his cohorts, he decides to take Jane away. He enlists the aid of his brother, Loki (Tom Hiddleston). Unfortunately, Loki's motivations remain unknown.—rcs0411@yahoo.com

There are nine realms of Asgard, and once every five thousand years, they align. Earth happens to be one of these realms. These realms create portals between the worlds during the alignment which is called "Convergence". On Earth, in London, England, Jane Foster (Natalie Portman) believes she and her crew have discovered one such portal. Foster, while investigating the phenomenon, is transported to another realm and comes in contact with a substance called the Aether. Upon coming into contact with the substance, it draws Thor (Chris Hemsworth) from Asgard back to Earth. Thor takes Jane to Asgard to be cured from the Aether. Unfortunately, in doing so, it draws more than just Jane to that world. Another being called Malekith (Christopher Eccleston) wants to use the Aether to destroy Asgard. Devising a plan with his brother, the war criminal Loki (Tom Hiddleston), Thor heads to "The Dark World" to destroy the Aether and save Asgard. But can Loki be trusted?—halo1k

A year after Loki's (Tom Hiddleston's) devastating alien attack on New York City, the Mighty Thor (Chris Hemsworth), along with his friends Lady Sif (Jaimie Alexander) and the Warriors Three fight to save the Nine Realms from deadly threats. When Thor's girlfriend Jane Foster (Natalie Portman) discovers a fluid like weapon called the Aether, she unknowingly awakens the evil Malekith (Christopher Eccleston) and his Dark Elf army. With this, Asgard may be facing its darkest hour. Thor forms an uneasy alliance with his nemesis Loki to save Jane, stop Malekith, and save the Nine Realms from total chaos and darkness.—ahmetkozan

Thor (Chris Hemsworth) returns to do battle with Malekith (Christopher Eccleston), the vengeful leader of a primordial race that seeks to destroy the Nine Realms, in this big-budget comic book adventure set after the events of Marvel's The Avengers (2012). With even Odin (Sir Anthony Hopkins) unable to protect Asgard from the approaching darkness, the god of thunder reunites with Jane Foster (Natalie Portman) and prepares to make the ultimate sacrifice in order to save the world from certain destruction.

Eons ago, Bor (Tony Curran), father of Odin (Anthony Hopkins), clashes with the Dark Elf Malekith (Christopher Eccleston), who seeks to destroy the universe using a weapon known as the Aether. Malekith wanted to transform the Universe back into one of eternal darkness. Aether is an ancient force of infinite destruction. The Aether could be unleashed only when the nine realms coincided in a line, which happens every 5000 years. But just as when the event occurred, Bor took the Aether from Malekith's grasp using the Bifrost. With the battle all but lost, Malekith orders his ships to fall upon the Asgard army, which meant that Malekith's forces were sacrificed to inflict maximum possible damage on the Asgard army.

After conquering Malekith's forces, including enhanced warriors called the Kursed (who had ingested a small part of Aether to transform into the Kursed), on their home world of Svartalfheim, Bor safeguards the Aether within a stone column. Aether could not be destroyed as its power was too great, and hence the order was to bury it in a place where no one could ever find it. Unbeknownst to Bor, Malekith, his lieutenant Algrim (Adewale Akinnuoye-Agbaje), and a handful of Dark Elves escape into suspended animation.

In present-day Asgard, Loki (Tom Hiddleston) stands imprisoned for his war crimes on Earth. Loki claims that he wanted to rule Earth as his birthright, as a benevolent God. Odin spares Loki due to Frigga, and orders Loki to be imprisoned instead of being executed. Meanwhile, Thor, alongside warriors Fandral (Zachary Levi), Volstagg (Ray Stevenson), and Sif (Jaimie Alexander), repel marauders on Vanaheim, home of their comrade Hogun (Tadanobu Asano); it is the final battle in a war to pacify the Nine Realms following the reconstruction of Bifrost, the "Rainbow Bridge" between realms, which had been destroyed two years earlier. The Asgardians soon learn that the Convergence, a rare alignment of the Nine Realms, is imminent; as the event approaches, portals linking the worlds appear at random.

In London, astrophysicist Dr. Jane Foster (Natalie Portman) and her intern Darcy Lewis (Kat Dennings) travel to an abandoned factory where such portals have appeared, disrupting the laws of physics around them. Ian Boothby (Jonathan Howard) is Darcy's intern. Separating from the group, Jane is Teleported to another world, right next to the column where Bor stored the Aether, where she is infected by the Aether. Heimdall (Idris Elba) (the protector of the Asgard portal via the rainbow bridge) alerts Thor that Jane has moved beyond his near omniscient sight, leading Thor to Earth. Jane is returned to Earth, but Darcy tells her that she was gone for 5 hours. Jane realizes that even rainwater would not touch her.

When Thor finds Jane, he finds that Jane has inadvertently released an unearthly force which Thor cannot understand. Thor returns with her to Asgard where Asgard medical professionals conduct a full diagnostic on Jane. They find a huge amount of energy surging within her. Odin, recognizing the Aether, warns that the Aether will not only kill Jane, but that its return heralds a catastrophic prophecy.

Odin says that the Nine realms are not eternal. They came into existence after the Universe began and will end in the future. But before the Nine Realms the Dark Elves reigned absolute over the Universe. The leader of the Dark Elves, Malekith, made a weapon called Aether out of the darkness. The other relics appear as stones, but Aether appears as a fluid and ever-changing. Aether changes matter into dark matter. Malekith wanted to use the Aether's power to return the Universe to darkness. Odin is adamant that the Dark Elves were killed by his father Bor.

Malekith, awakened by the Aether's release, turns Algrim into a Kursed & sets up base on Svartalfheim. They attack Asgard by sneaking in Algrim as a prisoner. During the battle, Malekith and Algrim search for Jane, sensing that she contains the Aether. Thor explains to Jane that during Convergence, the lines between realms becomes blurred and portals appear between them, which will vanish once the realms are out of alignment again.

Thor's mother Frigga (Rene Russo) is killed by Malekith protecting Jane, and Malekith and Algrim are forced to flee without Jane. The Dark Elves hide behind an invisible shield and even Heimdall cannot see them. In their attack, Algrim damaged the force field generator that protected Asgard and as such the entire city is defenseless. Odin argues that since they have the Aether, Malekith will be forced to attack again, and he wants Thor to wait. But Thor wants to take the fight away from Asgard. Despite Odin's orders not to leave Asgard, Thor (Chris Hemsworth) reluctantly enlists the help of Loki, who knows of a secret portal to Svartalfheim, where they will use Jane to lure and confront Malekith, away from Asgard. In return, Thor promises Loki vengeance on Malekith for killing their mother. With Volstagg and Sif stalling Asgardian soldiers and Fandral assisting their escape, Thor, Loki, and Jane head to Svartalfheim.

There, Loki tricks Malekith into drawing the Aether out of Jane, but Thor's attempt to destroy the exposed substance fails. Malekith merges with the Aether and leaves in his ship as Loki is fatally wounded while killing Algrim. Thor, cradling Loki in his arms, promises to tell their father of his sacrifice. Afterwards, Thor and Jane discover another portal in a nearby cave and reunite in London with Darcy and Jane's mentor Dr. Erik Selvig (Stellan Skarsgard) who was briefly institutionalized due to the mental trauma he suffered during Loki's attack on Earth.

While Malekith was extracting the Aether, Jane learns that Malekith plans to destroy the universe and restore the Dark Elves to dominance by unleashing the Aether at the center of the Convergence in Greenwich. Thor battles Malekith through various portals and across multiple worlds until one portal separates them, leaving Malekith unopposed on Earth. Thor returns just in time to help his mortal comrades Erik and Jane to use their scientific equipment to transport Malekith to Svartalfheim, where he is crushed by his own damaged ship, which is also transported to Svartalfheim.

Thor returns to Asgard, where he declines Odin's offer to take the throne and tells Odin of Loki's sacrifice. As he leaves, Odin's form transforms to that of a grinning Loki. In a mid-credits scene, Volstagg and Sif visit the Collector and entrust the Aether to his care, commenting that, with the Tesseract already in Asgard, having two Infinity Stones so close together would be dangerous. As they leave, the Collector remarks, "One down, five to go."

In a post-credits scene, Jane and Thor reunite on Earth while somewhere in London a frost monster from Jotunheim, accidentally transported to Earth during the final battle, continues to run amok.