Millie's new job as a mail cow keeps her very busy. Christmastime is especially hectic, and she can barely wait for the milking to be done before she's out delivering presents.
On Christmas Eve, at the end of a long day, the mail carrier sends Millie home with all the presents he's made for the farmer and the other animals. Only, Millie gets a bit confused by the snow-covered landscape. Suddenly everything looks the same, and the farm is nowhere in sight! Can Millie make it home to deliver the presents in time for Christmas? And more important, will the presents make it there in one piece?