Sora, Riku, and Kairi build a raft with the intent to leave their home world of Destiny Islands to explore new worlds. On the night before the planned voyage, the islands are attacked by the Heartless, and Riku and Kairi disappear. Before the Heartless consume the islands, Sora mysteriously obtains the Keyblade, a weapon effective against the Heartless. Meanwhile, King Mickey has left his own world to deal with the increasing number of Heartless, leaving instructions for Donald and Goofy to find the "key" that will protect the worlds from the encroaching darkness. Donald and Goofy use the Gummi Ship to travel to Traverse Town, where they find Sora after he has drifted there from his destroyed world. The three decide to travel together – Donald and Goofy to find Mickey, and Sora to find Kairi and Riku – traveling to various worlds and sealing "Keyholes" in the worlds that, when sealed, prevent the "heart" of those worlds from being consumed by the Heartless. Meanwhile, a group of Disney villains led by Maleficent seek out the seven Princesses of Heart to unlock the final keyhole that leads to Kingdom Hearts, a repository of knowledge and power, and the source of all hearts. Maleficent also finds Riku and recruits him into her services, manipulating him into believing that Sora abandoned him.