From cienmablend, Since Marvel first announced plans that it would be making an Avengers film, fans have assumed that the plot would be a storyline taken straight out of the comics: Loki, Thor's half-brother and the God of Mischief, uses his powers to brainwash The Hulk and creates global chaos, leaving only The Avengers to stop him. By the time the film rolls around in 2012, Loki, who will be played by Tom Hiddleston in Kenneth Branagh's Thor, will already be an established villain in the Marvel universe and taking a page right out of the comics would make all of the fanboys happy. On paper it appears to be a win-win, but perhaps Marvel doesn't see it that way.
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