The missile defense system stationed in space has gone haywire. Already two planets have been destroyed, will Earth be next? You job is to make your may through the defense grid which nobody has ever been able to do before and shut down the machine. You'll need fast reflexes to out run an electric wall, face antigravity hazard while trapped in a moving elevator, and avoid moving robotic Amtrak vehicles. The key to your survival is the ability to manipulate the antigravity force and fight both right side up and upside down!