Thor: The Dark World takes place almost exactly where The Avengers left off. Loki is hauled back in chains to face Odin and sentenced to life in prison. Before that, however, we get a big, action-packed flashback to Odin’s father, who battled the Dark Elves – beings who ruled “before” the universe as we know it existed. They want nothing more to go back to that status quo, so their leader Malekith tries to use a mysterious, dark-matter like, substance called ether. He fails and goes into hiding. Until Jane Foster manages to stumble upon the substance and wake it up. Now the substance is inside her, and Malekith will stop at nothing to get it out.