Jake Gyllenhaal goes down a troubling path that will end in not only his destruction, but those around him in the upcoming thriller Enemy. He stars as a depressed college history professor who discovers his doppelganger working as a movie extra. He quickly becomes obsessed with this other man and his seemingly better life, taking over various aspects of his day-to-day existence, which includes courting his significant other. We have the red band teaser trailer, which shows off the very dark side of this creepy thriller, in theaters soon.