In "Prince Caspian," the Pevensie siblings return to Narnia only to find it vastly different from the kingdom they once ruled. Centuries have passed, and humans have been oppressed by the Telmarine usurpers, with the true Narnians driven into hiding. The siblings aid Prince Caspian, the rightful heir to the throne, in his quest to reclaim his kingdom and restore peace. Together, they face treachery, battles, and supernatural challenges, including the resurrection of the ancient kings and queens of Narnia. Through courage, loyalty, and the guidance of Aslan, they strive to fulfill their destiny and restore Narnia's rightful order.