The ORN Empire is the main antagonistic force from the Thunder Force series. They are an evil army of cyborgs, controlled by the bio-computer Khaos. Their have a full armada of spacecrafts at their disposal, which makes most of their might. They have also built a variety of gigantic space fortresses, which enabled them to destroy and conquer many planets, spreading their evil influence across the universe. Their purpose is to eradicate all human life in the universe, and they are always fighting the forces of the Galaxy Federation , who have built the Fire LEO series of space-fighters to combat the ORN menace. Despite the Galactic Federation's efforts, ORN wasn't ever defeated for good, even with the destruction of Khaos, as they always seem to become more powerful with every defeat.