Distributor U.S. Release
Marvel's Thor: The Dark World continues the big-screen adventures of Thor, the Mighty Avenger, as he battles to save Earth and all the Nine Realms from a shadowy enemy that predates the universe itself. In the aftermath of Marvel's Thor and Marvel's The Avengers, Thor fights to restore order across the cosmos...but an ancient race led by the vengeful Malekith returns to plunge the universe back into darkness. Faced with an enemy that even Odin and Asgard cannot withstand, Thor must embark on his most perilous and personal journey yet, one that will reunite him with Jane Foster and force him to sacrifice everything to save us all.
the official version from marvel.com on August 19, 2013
In the comicbooks, Algrim the Strong (Adewale Akinnuoye-Agbaje) was the most powerful of a race of Dark Elves, who is coerced by Malekith the Accursed (Christopher Eccleston) to fight Thor (Chris Hemsworth). After he's betrayed by Malekith and injured during a battle, Algrim is healed and transformed into a much more powerful being called Kurse, who is twice as a strong as Thor.
a paraphrased formulation from variety.com on August 26, 2012
Sequel to the 2011 movie that was based on the Marvel comic character.
an original formulation based on information from deadline.com on June 30, 2011