Before they were the Avengers, Iron Man, Captain America, Hulk, Thor, Hawkeye and Black Widow were individual agents fighting for the good of humanity. When an unexpected enemy threatens global safety and security, Nick Fury, director of the international peacekeeping agency known as S.H.I.E.L.D., finds himself in need of a team to pull the world back from the brink of disaster. Spanning the globe, a daring recruitment effort leads to the most powerful group of heroes on earth!