In the distant future, Earth has been decimated by an intergalactic battle against an alien race known as the Scavs. The majority of mankind has been evacuated, leaving just a few solitary drone repairmen remaining on the planet's surface. Their job is simple -- stand guard over the ruins of a once-great empire by patrolling the skies, and ensuring the drones continue to function. Jack Harper (Tom Cruise) is nearing the end of his mission to extract resources essential to the survival of the human race when he witnesses a spacecraft fall from the sky. Upon investigating, Jack discovers the capsule contains a mysterious woman. With mission control watching his every move from high up above the clouds, Jack embarks on a spectacular adventure that will not only challenge everything he's been taught about mankind's most defining battle, but perhaps alter the entire course of human history as well.