Peter, Susan, Edmund, and Lucy all find themselves disappearing from a train in their world to a place which they figure out is Narnia, a land that they once ruled. As they wonder along, they realize that they are in Narnia 100 years into the future. They meet a dwarf that tells them the story of why he is here and what he is doing: Prince Caspian was a boy who ran away from his royal home and into the woods with his tutor Dr. Cornelius. As he runs away he meets many Old Narnian animals. He learns that his home country is declaring war on the Narnia that he has found. Prince Caspian, Peter, Susan, Edmund, Lucy and all the animals have to defend the war.