The document describes the origins and abilities of the Avengers characters - Iron Man, Thor, Captain America, Hulk, Black Widow, and Hawkeye. It then discusses the villains Loki and Thanos, and how Loki leads an army of Chitauri to attack New York City. This forces Nick Fury to reactivate the Avengers Initiative. The Avengers work to stop Loki's plan and protect New York from the invading aliens.