Lucy and Edmond, accompanied by their peevish cousin Eustace, sail to the magic land of Narnia, where Eustace is temporarily transformed into a green dragon because of his selfish behavior and skepticism.

Bree, a talking horse, and Shasta, a young boy, are joined by four English children and Aslan to help save Narnia from invasion. On a desperate journey, two runaways meet and join forces. Though they are only looking to escape their harsh and narrow lives, they soon find themselves at the center of a terrible battle. It is a battle that will decide their fate and the fate of Narnia itself.

When evil comes to Narnia, Jill and Eustace help fight the great last battle and Aslan leads his people to a glorious new paradise.