The Chronicles of Narnia (although we do not learn their surname until "The Voyage of the Dawn Treader"), and eventually become Kings and Queens of Narnia reigning as a tetrarchy. Although introduced in the series as children, the siblings grow up into adults while reigning in Narnia. They go back to being children once they get back to their own world, but feature as adults in "The Horse and His Boy" during their Narnian reign. All four appear in "The Lion, the Witch, and the Wardrobe" and "Prince Caspian"; in the latter, however, Aslan tells Peter and Susan that they will not return, as
Adaptations of The Chronicles of Narnia released the series on audiobook read by Sir Michael Hordern with original music composed by Michael J. Leslie and performed by Marisa Robles, as well as releasing a version read by the actor Tom Baker. From 1998 to 2003 Focus on the Family Radio Theatre recorded all seven Chronicles of Narnia on CD. Each book had three CDs apart from "The Magician's Nephew" and "The Lion, the Witch and the Wardrobe" which both had two CDs. They were released in association with The C.S. Lewis Company, with an introduction by Douglas Gresham. They used a cast of over one hundred