When Queen Prunaprismia(Alicia Borrachero) has a baby boy, King Miraz)Sergio Castellitto) orders his soldiers to kill Prince Caspian(Ben Barnes). However his tutor gives Susan's magic horn to him, telling that he should blow it if his life is in danger and asks him to ride to the forest. However he is chased by the Telmarian soldiers and he summons the Pevensie siblings Peter(William Moseley), Susan(Anna Popplewell), Edmund(Skandar Keynes), and Lucy(Georgie Henley). They discover that hundred of years have passed in Narnia and they join Prince Caspian to lead the people of Narnia against the evil King Miraz. When the battle begins, the siblings send Lucy to seek out Aslan(Liam Neeson), otherwise they will not beat the powerful Telmarian army.