When the Pegasi unleash a harsh blizzard upon Ponyville, Rarity finds that a strange pony pulling a haycart has collapsed in her yard. She invites him into her home for food and shelter. But what would compel anypony to be hauling a load in such weather? Why is it so important? The answer helps Rarity feel the true meaning of Hearth's Warming, and that sometimes the greatest joy of the Season isn't receiving, but giving.