The following does fall on the possible spoilers list so continue reading at your own desire... Latino Review is reporting that a reliable inside source has confirmed that the main villain for Joss Whedon's 'The Avengers' will be for Thor's adoptive brother and archenemy "LOKI".
Tom Hiddleston will portray Loki in the upcoming live-action Marvel Studios film "Thor" directed by Kenneth Branagh.
They also go on to confirm that Loki will us the cosmic cube seen in "Captain America: The First Avenger" and "Thor." Loki uses the cube to get a hold of the Aliens (aka The Skrulls) to invade Earth and fight "The Avengers." Skrulls are green-skinned reptilian humanoids with large pointed ears, red or green eyes, and corrugated chins. (PHOTO BY MARVEL COMICS SHOWN ABOVE LOKI)