Sunset Shimmer finally returns home to Equestria to right her old wrongs, unfortunately the sins of the Human World follow her back and put everypony in Equestria in danger.
Sweetie Belle wonders what is running through Opal's mind when she attacks Rarity one morning. During Twilight Time she runs across a spell that allows animals to talk. She memorizes it and casts it on some of the pets.
A year after the battle of the bands, graduation nears, a familiar face returns, a pure heart is corrupted, enemies become allies and the fate of all reality hangs in the balance.
Twilight Sparkle has finally perfected a device allowing ponies to speak to each other over great distances. Unfortunately, the first call she receives is from Pinkie.