The "Ender's Game Series," written by Orson Scott Card, is a science fiction saga that begins with the novel "Ender's Game." The story follows a young boy named Ender Wiggin, who is recruited into a military training program to prepare for an impending alien invasion. The series explores themes of leadership, morality, and the consequences of war. Subsequent books, including "Speaker for the Dead," "Xenocide," and "Children of the Mind," expand on the universe and delve into the complexities of Ender's life after the war. The series also introduces new characters and civilizations, examining the ethical dilemmas faced by humanity in a broader cosmic context.