It seemed like it would be a great day for the Cutie Mark Crusaders and Starlight Glimmer to be sent on another friendship mission, especially since the Cutie Map was sending them to the city of Vanhoover. As soon as they set hoof on this city, the mare and three fillies soon find themselves bumping into Sour Grapes: a teenage colt who quite possibly hates cutie marks even more than Starlight ever did. This sullen pony has been unhappy since the day he earned his cutie mark, and now it's up to Starlight and the Cutie Mark Crusaders to help him gain some happiness in his life.