The last remnants of the human race left a dying Earth, desperate to find a new home. Following their ancestors' star maps, they discovered the greatest treasure of a past age--a world terraformed and prepared for human life. But all is not right in this new Eden. The planet is not waiting for them, pristine and unoccupied. New masters have turned it from a refuge into mankind's worst nightmare. Now two civilizations are on a collision course and...

NASA's Kepler mission has identified more than 3,500 potential planets orbiting stars beyond the sun. Some of them, like a planet called Kepler-22b, might even be able to harbor life. Combining animation with input from expert astrobiologists, the program 'builds' aliens from the ground up.