"The 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 escape to Earth after their home is destroyed by the Mogadorians. Each of the characters possesses unique powers, which they must learn to harness while evading their enemies. The series begins with the first book, I Am Number Four, focusing on the character John Smith, one of the last surviving Lorien Garde. As the story unfolds, the characters unite to fight against the Mogadorians and protect Earth, exploring themes of friendship, identity, and resilience.