Thor,Iron Man,Black Widow,Hawk-eye,Hulk and Captain America all meet in New York to meet with Nick Fury
Loki is on the run with some of Nick Fury's men after he escapes a secret base with the Tesseract.
Loki has made a deal to give earth to some aliens if they give him an army so he can defeat the avengers
Loki gets his army and attacks New York the Avengers are the to defend it
Loki's army is defeated after the avengers close up the portal letting the Chitauri force into earth, Loki is defeated.
Loki is taken back to Asgard with brother Thor and the Tesseract. The rebuild of New York must begin the Avengers have won.