The X-Ship is Lord Crump's ship in Paper Mario: The Thousand-Year Door. It is a black ship with a spiky tail equipped with cannons. Besides the main cannon, the ship carries port and starboard cannons.
The ship is used to fight Cortez' ship, the Black Skull. When Lord Crump shoots the cannons, this angers Cortez. He, Mario and his team, Flavio and a certain amount of Embers attack the X-Ship. This creates a melee between the shipwrecked Toads, Embers and X-Nauts, along with Francesca and Frankie, leaving Mario and his team to deal with Lord Crump himself.