One year after the incredible events of "The Lion, The Witch and The Wardrobe," the newly-annointed Kings and Queens of Narnia find themselves back in that faraway wondrous realm, only to discover that more than 1000 years have passed in Narnian time. During their absence, the Golden Age of Narnia has become extinct, and now exists as little more than folklore. The land's magical talking animals and mythical creatures have disappeared, becoming little more than folk tales to the Telmarines, a race of humans led by the evil King Miraz, who now rules the land without mercy. Though his name is still remembered in the woods, the mighty lion Aslan has also not been seen in a thousand years.

The four children have been summoned back to Narnia by Caspian, the young heir to the Telmarine throne whose life is in danger as his evil uncle Miraz plans to eliminate the young warrior so his own newborn son can ascend the throne. With the help of the kindly dwarf, a courageous talking mouse named Reepicheep, and a leery Black Dwarf, Nikabrik, the Narnians, led by the mighty knights Peter and Caspian, embark on a remarkable journey to find Aslan, rescue Narnia from Miraz's tyrannical hold, and restore magic and glory to the land.