Oswald is a favorite. Of all the toys in Billy's home the stuffed rabbit takes top rank: everywhere Billy goes so goes Oz. But being a favorite is more than a privilege it's also fraught with danger. Because of Zozo. Zozo has never been a favorite. An amusement park prize who was never chosen Zozo has grown so bitter that when the amusement park closes he seeks revenge on every toy lucky enough to be a favorite. He wants them all to become The Lost and even better Forgotten. When Billy accidentally leaves Oz under the table at a wedding Oz finds himself on an unplanned adventure kidnapped by the nefarious Zozo and his gang of creeps and faced with the momentous task of saving not only himself but all the other stuffies who are "lost" as well.