Paper Mario: The Thousand Year Door is an RPG game released in 2004 for the Nintendo Gamecube. It is second game in the Paper Mario Series. In the game, Princess Peach is kidnapped by the X-Nauts a group of mysterious things from space. Mario along with several partners, which will be met one-by-one in each chapter, must find the seven crystal stars before the X-Nauts. Mario's abilities, along with his signature abilities, are revolved around paper (folding into a paper plane, going into a 2D state in which Mario can move through small cracks, etc.).