A hidden foe manipulates the newly assembled team from the shadows, meticulously sowing the seeds of discord and mistrust - and causing the new allies to question the very ties that bind them together as they hunt for the fugitive Hulk. Thor - a shape-shifting alien with a secret agenda? Captain America - a hoax? Iron Man - an enemy conspirator? Their confidence in each other shattered, will the heroes destroy each other before the conspirator is revealed?