An accident with the Mirror Portal ends up with Twilight stuck as a small pony in the Equestra Girls' world. Her friends can't get over how cute she is.
The mysterious Table of Harmony has called on Starlight Glimmer to solve a friendship problem at Canterlot Castle, but wait! A second cutie mark belonging to a magically inclined alicorn has appeared, and unfortunately for Twilight, it’s not hers.