When a mysterious door is unlocked, a storm of evil forces rain down on a small tropical island. Sora, a teenage boy, and his friends, are transported to another world, one that is dominated by darkness. A mysterious race of beings have invaded; they are known only as the Heartless: those without compassion. Sora is chosen as the master of the Keyblade, the only weapon with the power to vanquish the Heartless and their dark intentions. Meanwhile, an unknown high council of mysterious rulers have bound together to control the Heartless and gain forceful dictatorships over their people with violence and fear. Meeting up with two elite commanders from the Kingdom Castle (Donald and Goofy) who are on a mission from their missing king (Mickey Mouse), Sora seeks out his lost friends and combats the armies of evil to uncover the identity of the true master of the Heartless.