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Fifty years prior, an alien species called the Formics attacks Earth, killing millions, but the invasion is ended by a commander (Mazer Rackham) who rams his ship into an alien vessel, stopping the rest of their fleet.
In response to the attack, humanity trains gifted children to become commanders. Cadet Andrew "Ender" Wiggin draws the attention of Colonel Hyrum Graff and Major Gwen Anderson. He defeats one of his classmates (Stilson) in a space battle simulation. To test him, Graff and Anderson remove Ender's monitor, signifying his removal from the program. Stilson, embarrassed by the loss, attacks Ender but is severely beaten. At home, Ender confesses grief over his actions to his sister Valentine and faces their older brother Peter in a fight where he is nearly choked. Graff and Anderson visit the Wiggins and offer Ender a place in Battle School.
Ender joins the other "launchies" aboard the shuttlecraft for Battle School. They are shown their accommodations, the classes, and a large glass sphere called the Battle Room, where they are to play laser tag-like games in zero gravity. Although Ender is initially looked down on, he earns respect from his peers when he tests the authority of the commanders. In his off time, Ender plays a "mind game" program where his character is presented with a no-win scenario. Frustrated, he decides to kill the presenter of the dilemma, something that Major Anderson has never seen a student attempt before.