Rarity gets a letter from Princess Celestia requesting that she design new armor for the royal guard. As Rarity receives this letter, Pinkie Pie experiences one heck of a doozy. She knows it has to do with Rarity! She's certain of it! So Pinkie Pie goes to Canterlot with Rarity, determined to find the source of the doozy. Meanwhile she keeps running into Princess Luna during her late night adventures.