Edmund and Lucy Pevensie, along with their cousin Eustace, are swallowed into a painting and transported back to Narnia and the magnificent ship The Dawn Treader. They join King Caspian and a warrior mouse named Reepicheep for a mission which holds the fate of Narnia itself. The courageous voyagers overcome their own greatest temptations, as they travel to mysterious islands; have fateful confrontations with magical creatures and sinister enemies; and reunite with their friend and protector, the "Great Lion" Aslan.