Aliens have attacked Earth twice and have nearly destroyed the human species. To make sure humans win the next encounter, the world government has begun breeding military geniuses and training them in the arts of war. Early soldier training takes the form of 'games,' and Ender Wiggin is a genius among geniuses; he outmaneuvers each opponent he encounters. He is smart enough to know that time is running out, but he has not yet played a game as intricate as trying to save the planet.La Tierra se ve amenazada por una raza extraterrestre que se comunica telepáticamente y considera no tener nada en común con los humanos, a los que quiere destruir. Para vencerles es necesario un genio militar y por ello se ha permitido el nacimiento de Ender. Ender es un genio y puede ganar todos los juegos usados por en gobierno para entrenar el ejército a proteger la Tierra.
