You watched Sigourney Weaver fight aliens with grenade launchers, blowtorches and powerloaders in James Cameron's Aliens. Now watch as she shares a heartfelt tale about aliens in James Cameron's Avatar (not the same kind of aliens, mind you). Dr. Grace Augustine describes the unfortunate tensions between humans and Na'vi on Pandora -- tensions that sometimes turn violent and tragic. This is a deleted scene that's featured on the Avatar Extended Edition, available for purchase on Nov. 16.
