The Secret Society of X-Nauts or the SSOX, is a group of creatures believed to be aliens that are trying to take over the world in Paper Mario: The Thousand Year Door. They are led by their leader, Sir Grodus, who is trying to rule the world and make it a perfect world based upon him.
The X-Nauts can create machines, make potions to hurt their enemies and much more just to get closer to their goal.
They fall apart in the end and only six members remain after the game.