Peter, Susan, Edmund and Lucy Pevensie ruled the fantasy world of Narnia for many years. When they returned to the human realm, they became ordinary children again. A year has passed since they left Narnia, and the children are sitting in a railway station, waiting for the trains that will take them back to boarding school. They are suddenly pulled back into Narnia, but they don’t recognize the place at first, because they left a thriving civilization and have returned to a deserted wilderness. They find that 1,000 years of Narnian time has passed during the one year they spent in England, and Narnia is in need of their help again. Trumpkin the dwarf finds them in the ruins of their old castle, Cair Paravel, and tells them that an evil king called Miraz now rules Narnia, and his subjects are called the Telmarines. Young Prince Caspian is the rightful heir to the throne. Caspian wants to end the persecution of Narnia’s talking animals and the other magical creatures that were driven into hiding by Miraz.
Trumpkin tells Prince Caspian’s story to the Pevensies, and they all decide to travel to his aid. They have a difficult journey, which is further complicated when the children refuse to follow Lucy. She sees Aslan leading them in a different direction. When their attempts fail, they finally do follow Lucy, who leads them to the Stone Table where Aslan greets them. The girls remain with Aslan while the boys and Trumpkin to go into the Mound, a cave where Caspian’s army is staying. They discover a hag and a werewolf who are trying to convince Caspian to follow the White Witch and bring her back from the dead. Prince Caspian and Trumpkin kill the two evil creatures. Peter decides to help Caspian by offering to fight Miraz by himself. Then the winner of the fight will win the war.
Two lords of the Telmarines persuade Miraz to accept the challenge. Miraz fights Peter but is killed by his own men during the duel. A battle breaks out between the Telmarines and the Narnians. Meanwhile, Aslan’s magic restores Narnia to its former glory. When the Telmarines see him, they surrender. Aslan establishes Caspian as the king of Narnia, and the Pevensie children are sent back home to England.