In the distant past, Bor, the father of Odin, faced off against Malekith. The leader of the Dark Elves sought to unleash a weapon called the Aether on the Nine Realms before Bor handed him a crushing defeat. Following his victory, Bor secured the Aether in a stone column, though Malekith and a portion of his forces manage to escape.
It is now the year 2013 and Loki, the adopted son of Odin, stands trial for instigating a coordinated attack with the Chitauri in New York City one year prior. Meanwhile, the Bifröst has been recently reconstructed, causing no shortage of turmoil in the Nine Realms. Thor, along with Frandral, Volstagg, and Sif, repel an invading army on Vanaheim. After achieving victory, Thor and his comrades learn of the Convergence – a rare event in which the Nine Realms align. This causes interdimensional portals to appear at random. One such portal happens to be in London, England on Earth, drawing the attention of Dr. Jane Foster.