Loki: Adopted son of Odin, second in line to the throne of Asgard. Loki wanted only to please his father, but his Frost Giant heritage and his jealousy of his brother Thor made him dangerous. Now, he hopes to turn Earth into his own personal kingdom, even if he has to destroy it first.
Nick Fury: As head of the Strategic Homeland Intervention, Enforcement and Logistics Division (S.H.I.E.L.D.), Nick Fury runs one of the world's most clandestine and technologically advanced security agencies with an international mandate. Fury is the one who first brings the Avengers team together.