Adewale Akinnuoye-Agbaje, more familiar to many of us as Mr Eko from Lost has been cast in the dual roles of Kurse and Algrim the Strong in the upcoming movie, Thor: The Dark World.
Algrim the Strong is the most powerful of the Dark Elves, until he is crossed by Malekith (who we already know to be in the movie). He is brought back by the cosmic being known as the Beyonder, and is dubbed Kurse. Kurse battles Thor until realizing that it is Melekith who betrayed him. Kurse is redeemed and once again becomes Algrim.
It is unknown how much if any of this will take place within the movie.