Loki, Thor's half-brother, returns, and this time henot one. Earth on the brink of enslavement, and only the best of the best can save humanity.
Nick Fury, head of the international organization S. I. T., gathers prominent advocates of justice and goodness, to repel the attack. Under the leadership of Captain America, Iron Man, Thor, The Incredible Hulk, Hawkeye and Black Widow go to war with the invader.