I'll do it.
It started in Japan a few years ago. Disney and Squaresoft share the same office building in Tokyo. One of the executives from Squaresoft approached a Disney executive with the idea and they worked together to create this game.
In it, Sora (Who suspiciously resembles a human version of Mickey) is thrown off his tiny island into Traverse Town where he meets Goofy and Donald. They are looking for Mickey, who has gone to investigate why the stars are going out. As usual, the Disney villains are behind it, but are led by the mysterious Ansem, who has dispached enemies called the Heartless to stop them. The heroes go from world to world, trying not to disrupt the world order and get rid of the Heartless.