King Tirian has ruled over Narnia peacefully since King Caspian's reign. However, he is informed by Roonwite that there is an ominous presence in Narnia.
Elsewhere in Narnia, Shift, an ape, has convinced Puzzle, a donkey, to dress up as Aslan. Shift uses this ploy to encourage people to support the Calormen and cut down the talking trees.
Tirian realizes the deception and calls Shift out for it. However, he is restrained and tied to a tree for his accusation. Here, Tirian calls upon Aslan for help but instead receives a vision of Lord Digory, Lady Polly, Lord Eustace, High King Peter, Kind Edmund and Queen Lucy. Jill and Eustace are sent to Narnia where they release Tirian from the tree and Puzzle decides to join them.
Sift and Risha, a corrupt Calormen noble, convinces the people that Aslan and the great God Tash are the same person. However, the have accidentally summoned the real Tash to Narnia.
The Narnian begin to be attacked by the Calormen and Tirian and Shift engage in a battle. However, Tash arrives and swallows up Shift. Rishda, who is now afraid, surrenders the rest of the Narnians to Tash. However, Tash seizes Rishda and attempts to attack Tirian. Suddenly, Peter, Edmund, Eustace, Lucy, Jill, Polly, and Digory all appear and cause Tash and Rishda to vanish from the realm.
Narnia begins to get destroyed and everyone is judged by Aslan, in order to be deemed if they are worthy enough to enter Aslan's Country. Those who did not believe in Aslan are converted to normal, non-talking animals as Father Time freezes the land. Aslan leads his faithful followers into Aslan's country. Here they see Reepicheep and other fellow Narnians. Aslan then informs them that in England, they have all died in a train crash, with the exception of Susan, who is still alive but no longer believes in Narnia. They then spend their years in Narnia.
