Eureeka's Castle: Christmas at Eureeka's Castle is another creative offering by Nickelodeon. All of the characters are puppets in this visionary castle. As a sorceress in training, Eureeka meets her share of interesting folks, including the clumsy dragon Magellan and Mr. Knack, the know-it-all bat. Children can laugh and dance with Eureeka in this award-winning program. Eureeka's Castle is recommended for preschool ages.