When she fled Canterlot, Sunset travelled so much further then she thought possible, into a galaxy so much larger then any first thought. Yet with her homecoming, she finds that galaxy has not left Equestria alone. But ambition only sees opportunity.
Princess Luna assembles a team of Equestria's most undesirable inhabitants in order to deal with the problems too dangerous to risk the lives of the Elements of Harmony.
Sunset Shimmer is living proof that people can change. When she finds out that the Dazzlings are being expelled for their crimes, she will make an attempt to understand their past and salvage their future.
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.
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.
What Measure is a Monster? When six darkened beings from different worlds and times are brought to Equestria, will they adapt to the peace, or seek to destroy it?