Much literature for children appears in the form of series, in which familiar characters appear in book after book. In the late nineteenth and early twentieth century, authors began to write science fiction series for children. These early series generally had plots that revolved around inventions developed by the protagonist. But it was the development and use of rocket and atomic science during World War II that paved the way for interesting and exciting new themes, conflicts, and plots. While much has been written about the early juvenile science fiction series, particularly the Tom...