Fox has released three teaser posters for the upcoming Terra Nova. (Featured below.) Terra Nova follows the adventures of the Shannons, an ordinary family who embark on an extraordinary journey back in time to prehistoric Earth as part of a massive experiment to save the human race. In the year 2149 the world is dying. The planet is overdeveloped, overcrowded and overpolluted. Knowing there is no way to reverse the damage, a collection of scientists manage to create a portal to prehistoric Earth. This doorway leads to an amazing world, and a last opportunity to save the future of the human race by correcting the mistakes of the past.