Peter, Susan, Edmund and Lucy Pevensie are siblings who are evacuated from London because of the air raids in World War II.

There, they become involved in a war against the White Witch, and help restore the true ruler, a lion called Aslan, serving as kings and queens under him for many years before returning to their own world through the wardrobe.

The four Pevensie children are waiting at a train station when a magical force pulls them back into Narnia, where they help Prince Caspian overthrow his evil uncle, King Miraz, and take the throne.

Alone, Jill encounters Aslan, who explains that in Narnia, King Caspian's only son and heir, Prince Rilian, disappeared some years earlier.

Aslan sends Jill to Narnia, where she is reunited with Eustace near the castle of Cair Paravel and the two follow the four signs as they search for the lost prince.