"Lorien Legacies" is a young adult science fiction series written by Pittacus Lore. It follows a group of alien teenagers from the planet Lorien who possess special powers and abilities. They are on Earth to escape the Mogadorians, a hostile race that destroyed their home planet. The story primarily focuses on the character John Smith, also known as Number Four, as he navigates life on Earth while trying to evade his enemies. The series consists of several books, starting with "I Am Number Four," and explores themes of friendship, loyalty, and the struggle between good and evil. Each character, known by their assigned number, has unique gifts that they must learn to control. The narrative combines action, adventure, and elements of romance, appealing to a wide range of readers.