The Nickelodeon Fun Studio Intl. Mini Book Nella Saves Christmas The Princess Knight is a collectible paper item from the Nickelodeon entertainment brand. This mini book likely features the story of Nella, a character from the animated series "The Princess Knight," and how she saves Christmas. Fans of Nickelodeon and collectors of ephemera from the 1960s to now would likely appreciate adding this unique and entertaining piece to their collection.