The Chronicles of Narnia..

Siblings Lucy, Edmund, Susan and Peter step through a magical wardrobe and find the land of Narnia. There, they discover a charming, once peaceful kingdom that has been plunged into eternal winter by the evil White Witch, Jadis. Aided by the wise and magnificent lion, Aslan, the children lead Narnia into a spectacular, climactic battle to be free of the Witch's glacial powers forever.