A mysterious person comes into the universe of the Equestria girls with a plan, a plan to set old enemies of the Mane seven free.In order to defeat them the friends will first have to figure out something is wrong.

With a new band that catches 3 of the 7's eyes Sunset Shimmer becomes suspicious. Little do they know that one of them is in major trouble and that they will have to rescue her from the clutches of the mystery enemies.

With the help of her friends will Sunset Shimmer be able to beat them? Or will the elements of Harmony finally fall?