|This article is a Part of the Super Paper Mario Project.|
In Chapter 2, Lord Crump and his troops invade the Tree to find the emerald star. Mario will have to do battle with them multiple times throughout the tree. X-Nauts can be found guarding multiple areas.
In Chapter 7, Mario re-encounters them. This time, he will face two ther types of X-Nauts. Although, in this chapter, they are not as common.