After Loki, the Asgardian god of mischief and Thor's adopted brother, makes a deal with the alien warlord Thanos's servant to acquire an army, he steals the powerful Tesseract energy source from a S.H.I.E.L.D. facility. In response to this unprecedented global threat, Nick Fury, the director of the international peacekeeping agency S.H.I.E.L.D., reactivates the "Avengers Initiative.
