Kingdom Hearts

Xehanort's Nobody Xemnas is the leader of Organization XIII. The Organization's plan is also revealed—they seek the power of "Kingdom Hearts", the sum of all the hearts that Sora released by destroying the Heartless with his Keyblade, to regain their lost hearts. The three arrive at the headquarters of Organization XIII and team up with their friends. Ansem the Wise uses a device that dissipates some of Kingdom Hearts' power, but a system overload causes the device to self-destruct, engulfing Ansem. At the top of the Castle that Never Was, Sora and his friends battle Xemnas, who uses what remains of Kingdom Hearts to power his multiple forms. After Sora and Riku destroy Xemnas, the two are reunited with their friends at their home.

Another year later, Sora, Riku and Kairi receive a message from King Mickey detailing his discovery—shown during the events of Kingdom Hearts coded—that Sora is destined to save three Keyblade wielders featured during the events of Kingdom Hearts Birth by Sleep, ten years before the original game—Terra due to his body was taken over by the rogue Keyblade Master Xehanort, becoming the incarnation of Xehanort that battled Sora as "Ansem" and Xemnas; Ventus due to his heart was damaged after defeating his evil doppelganger Vanitas (who used the X-Blade) and ended up within Sora's heart while his comatose body lies hidden within Castle Oblivion; and Aqua due to being trapped in the realm of darkness. King Mickey also discovers that the destruction of "Ansem" and Xemnas has led to the reconstruction of Master Xehanort. To combat the new threat Xehanort poses, Sora and Riku take an exam to attain the "Mark of Mastery" that will allow them to become Keyblade Masters themselves.

During the test in Kingdom Hearts: Dream Drop Distance, Sora and Riku enter into the Realm of Sleep where they learn of Xehanort's true goal: Xehanort plans to create thirteen replicas of himself by placing a piece of his own heart in each "host", thus infecting the body's original heart and taking it ove