Kroodle's Castle was a dark castle on a mountainous island surrounded by ocean and it belonged to the evil wizard Kroodle. It is a location in the 2011 TV special Louie and the Rainbow Fairy based on the 2005 French animated series Louie. It is where the Rainbow Fairy was imprisoned. The castle is home to an army of territorial creatures known as "Krockolors". They are sent by Kroodle to turn all the world's colours into black. Before Louie and Yoko are able to stop the dark wizard from ruling, the Blue Knight failed to stop him, thus being one of the dark creatures.