The Chronicles of Narnia: Prince Caspian (3 stars) William Moseley , Anna Popplewell , Georgie Henley , Skandar Keynes , Ben Barnes . Directed by Andrew Adamson . 137 minutes. Rated PG. The reason that siblings Peter ( Moseley ), Susan ( Popplewell ), Edmund ( Keynes ) and Lucy ( Henley ) find themselves back in the fantasy world of Narnia is that the titular prince ( Barnes ) has blown a mystical horn that ...