The three Sirens were once powerful threats to Equestria itself, sowing chaos with their enchanted voices and growing ever more powerful from feasting on negative emotions. Unable to defeat them, the great mage Starswirl the Bearded resorted to banishing them to another dimension, where magic was nonexistent and their power was nullified, or at least reduced to nothing but a pale shadow of what it once had been.

The three sirens are first seen in a city cafe, where they are observed absorbing negative energy from the customers there, complaining about the miserly amounts of power they gain from this. Then they witness the Harmony blast that defeated Sunset Shimmer in the previous movie. They realize that magic has been brought into the Human World (due to Sunset Shimmer's theft of the Element of Magic), and that their own power has returned as a result. Now once again in possession of their magical abilities, they decide to take over the Human World, starting with Canterlot High, the source of the magic. you are zar the demon of good and you'll face against them in siren showdown Chapter 2