In Nickelodeon's The Loud House Movie, the biggest family on television goes on the biggest Loud family vacation ever! The adventure follows the Loud family to Scotland where they discover that they are descendants of Scottish royalty. The family quickly indulges in the most wish-fulfilling high-life ever when they discover their ancestral home is a castle. While working underground to fix a water main, Mario and Luigi are transported through a mysterious pipe to a magical new world.