It's Twilight Sparkle's first night as a princess, and she can't sleep. Her thoughts are haunted by a question that will not let her rest. A question that only Celestia can answer.
Cutie Mark Crusaders Time Travelers, yay! ...Wait, what? When older versions of Apple Bloom, Sweetie Belle, Scootaloo and Spike appear from the future, Twilight and her friends are in for an adventure that may decide the fate of time itself!