Darkness is approaching and the world has erupted into chaos. Even though Thor doesn't trust Loki, they will team up to save the Nine Realms. Will Thor's plan to stop Malekith get them both killed? Find out in four new Thor: The Dark World international TV spots, along with the first clip, which finds Thor (Chris Hemsworth) coming to his brother (Tom Hiddleston) for help. Just how desperate is Thor?