Open Road Films has unveiled the teaser trailer for Oliver Stone's "Snowden," the biopic about information analyst and NSA whistleblower Edward Snowden. Joseph Gordon-Levitt, Shailene Woodley, Melissa Leo, Zachary Quinto, Tom Wilkinson, Rhys Ifans and Nicolas Cafe star in the film which is based on the books "The Snowden Files" and "Time of the Octopus".