to forge a Keyblade with the power to unlock people's hearts, intending to free Kairi's heart from Sora's. Sora restores their hearts after using Ansem's Keyblade on himself to revive Kairi, destroying it. The other princesses remain at Hollow Bastion to contain the darkness spilling from the Keyhole until the door to Kingdom Hearts is sealed, subsequently returning to their homeworlds. In the prequel Birth by Sleep, it is revealed that Master Xehanort seeks out the Princesses of Heart, spurring Maleficent into gathering them as well; it is later explained in Dream Drop Distance that the princesses' hearts represent the seven fragments of light broken off from the χ-blade, which Xehanort intends to use in his plan to forge the weapon. To prevent this, Yen Sid prepares to substitute the princesses with seven Keyblade wielders to clash with Xehanort's reformed Organization XIII. Party members and summons Several games in the Kingdom Hearts series feature computer-controlled characters that are added to the player's party in a specific world. The first game features six different party members in addition to Donald and Goofy: Tarzan in the Deep Jungle; Aladdin in Agrabah; Ariel in Atlantica from The Little Mermaid; Jack Skellington in Halloween Town from The Nightmare Before Christmas; Peter Pan in Never Land; and Beast from Beauty and the Beast in Hollow Bastion, a world exclusive to the series. In addition, there are six characters that can be acquired as summoned allies in the game: adult Simba from The Lion King, Genie from Aladdin, Dumbo, Bambi, Tinker Bell from Peter Pan, and Mushu from Mulan. Chain of Memories features the same party and summoned characters from the first game, with the inclusion of Cloud Strife as an additional summon. Aladdin, Jack, and the Beast return as party members in Kingdom Hearts II, with Ariel appearing in a non-playable capacity, and Peter Pan appearing as a summon in tandem with Tinker Bell. Adult Simba is featured as a full party member in The Lion Kings Pride Lands, while Mushu becomes a supporting ally in tandem with new party member Mulan in the film's Land of Dragons. Other new party members include Final Fantasy X character Auron in the Hercules-inspired Olympus Coliseum world, Jack Sparrow in the Pirates of the Caribbeans Port Royal, and Tron in Space Paranoids. Chicken Little and Stitch are included as new summons.Birth by Sleep removes the standard party system