"Thor: The Dark World" is a 2013 superhero film and the sequel to the 2011 movie "Thor." It follows Thor, the Norse god of thunder, as he battles an ancient race led by Malekith, who seeks to plunge the universe into darkness using a powerful weapon called the Aether. Thor must unite with his estranged love, Jane Foster, and his brother, Loki, to save Asgard and the Nine Realms. The film explores themes of sacrifice, loyalty, and the struggle between light and darkness. Directed by Alan Taylor, it features a blend of action, adventure, and fantasy elements, showcasing the rich mythology of the Marvel Cinematic Universe.