The Voyage of the Dawn Treader is the 3rd Narnia movie based off the books by C. S. Lewis. Susan and Peter appear slightly in the movie, but Edmond and Lucy are the main characters. The movie introduces the Pevensie's cousin, Eustace, a know it all boy who has won "the school hygiene award three years running". After a few things happen, Eustace's view of Narnia changes from it being a fairytale land to it being a wonderful true, real place. You should definitely watch this movie!