The Cake twins are on a mission to get their Cutie Marks, and they're out to get the help of some of the coolest ponies in Ponyville. Unfortunately, they also have to deal with the antics of the lamest pony in Ponyville. It's hard to imagine a pony less cool than the party-obsessed pony whose only ambition in life is to someday take over their parents' bakery.

But as when they unexpectedly run into some very famous ponies and learn a bit about their town's history, they learn that there might be more to their old foalsitter than meets the eye.