Everyone knows Santa's elves make toys for nice children. But who takes care of the reindeer and stuffs the stockings with coal for the naughty children? Those tasks fall to the coal dust elves.Gusto is the latest in this line of little-known elves. When he becomes preoccupied with making especially nasty stockings for naughty children and gleefully imagining their disappointment on Christmas day, Santa intervenes and takes him on a discovery of what the spirit of Christmas really is.