Two English children undergo hair-raising adventures as they go on a search and rescue mission for the missing Prince Rilian, who is held captive in the underground kingdom of the Emerald Witch.
Lucy and Edmund, accompanied by their peevish cousin Eustace, sail to the land of Narnia where Eustace is temporarily transformed into a green dragon because of his selfish behavior and skepticism.
When Digory and Polly try to return the wicked witch Jadis to her own world, the magic gets mixed up and they all land in Narnia where they witness Aslan blessing the animals with human speech.
Four English children return to Narnia and join Aslan in saving Prince Caspian from his murderous uncle, overthrowing the evil Telmarines and restoring Caspian to his throne.