film on which the world is based. Such party members include Fa Mulan, the woman who passes as a man in order to take her ailing father's place in the army; Jack Sparrow, a pirate who seeks to reclaim his ship, the Black Pearl; Simba, the self-exiled lion who is the rightful king of the Pride Land; and Tron, a security program in Hollow Bastion's computer network who seeks to end the dictatorship of the Master Control Program. Organization XIII, a group of powerful Nobodies—the "empty shells" left over when a strong-hearted person becomes a Heartless—introduced in Chain of Memories, is established as the primary group of antagonists early on. Xemnas, the leader of Organization XIII, serves as the main antagonist and final boss of the game. Villains unique to the worlds are still prevalent, and are often presented as challenges that Sora's group must overcome. Story Sora, Donald, and Goofy have been in suspended animation for the past year to regain their lost memories. Roxas, Sora's Nobody, is trapped in a virtual simulation of Twilight Town created by DiZ to merge him with his original self to restore Sora's power. DiZ's plans are threatened when Nobodies led by Axel, Roxas's former friend in Organization XIII, infiltrate the virtual town to extract Roxas. However, Roxas is able to repel the Nobodies and finally merge with Sora. Sora, Donald, and Goofy awaken in the real Twilight Town and meet King Mickey and Yen Sid, who send them on another journey; their goal is to find Riku and uncover the Organization's plans. Afterward, Maleficent is resurrected and joins with Pete to continue her quest for power. Sora travels to familiar and unfamiliar worlds, where he resolves several problems caused by Organization XIII, the Heartless, and various local villains. During a visit to Hollow Bastion, they reunite with Mickey, who explains that the Heartless "Ansem" they defeated is an imposter named Xehanort, whose Nobody, Xemnas, is the Organization's leader. The Organization also reveal that they seek the power of Kingdom Hearts, creating one from the hearts Sora has released from the Heartless with his Keyblade, to regain their lost hearts; in addition, Sora discovers that the Organization is holding Kairi hostage to force him to comply. Sora revisits the worlds to solve lingering problems and new complications while seeking a path to Organization XIII's base of operations in the World That Never Was.