The next day, Aslan is approached by the White Witch who demands her right to kill Edmund, as the deep magic states that all traitors belong to her.

The Pevensies are summoned into Narnia from their world to help Caspian—the rightful King of Narnia—overthrow his usurping Uncle Miraz and restore freedom to the land.

Aslan helps Peter, Edmund, and Trumpkin the Dwarf to come to Caspian's aid in time to thwart an attempt on his life.

Edmund and Lucy Pevensie are transported to the eastern ocean of the Narnian world along with their cousin, the recalcitrant Eustace, where they join King Caspian on a seafaring journey.

Prior to the story's opening, he delivered the infant Prince Cor of Archenland from his enemies to a Calormene fisherman who named him Shasta.

At one point in the book, Aslan—pretending to be a common "witless" lion—chases Shasta and the talking horse Bree so that they will meet Aravis and Hwin, who become their traveling companions.

This book tells the story of Aslan's creation of Narnia, his crowning of its first King and Queen, and his gift of the power of speech to some of the animals.

Aslan tells the two main characters—Digory Kirke and Polly Plummer—that the evil Jadis (later to become the White Witch) will pose a great threat to the Narnians.

Aslan charges Digory and Polly with a quest to acquire a magic apple that, when planted, will protect Narnia from Jadis.

Though Shift the Ape and the other villains act in his name (dressing the naïve donkey Puzzle in a lion-skin), Aslan himself only appears late in the story in a paradise entered through a stable door.

Aslan's words to the Calormene in The Last Battle ("I take to me the services which thou hast done to [the false god]... if any man swear by [him] and keep his oath for the oath's sake, it is by [Aslan] that he has truly sworn, though he know it not, and it is I who reward him"), ratifying the good deeds the latter did even in service to a false god, have been the subject of controversy because they implicitly endorse inclusivism.

[13][14] In the BBC television adaptations of The Chronicles of Narnia, Aslan was performed by Ailsa Berk and William Todd-Jones and voiced by Ronald Pickup.