Lucy is the daughter of a museum curator; Edward is an Mexican orphan; Susan is an adopted orphan from Namibia; and Peter is a student at the Mutant Academy. All four end up winning an epic adventure with Willy Wonka. When they find out that Willy uses human parts for his products, they manage to escape via a wardrobe, straight into Gnarnia, where they will be trained and betrayed by Harry Potter and the pirates of the Caribean respectively, and must seek the assistance of Aslo to battle the invincible White Witch and her hordes. The plan goes awry when one of their very own ends up being seduced and then abducted by her.

The world is divided into four kingdoms, each represented by the element they harness, and peace has lasted throughout the realms of Water, Air, Earth, and Fire under the supervision of the Avatar, a link to the spirit world and the only being capable of mastering the use of all four elements. When young Avatar Aang disappears, the Fire Nation launches an attack to eradicate all members of the Air Nomads to prevent interference in their future plans for world domination.