Note: The following events occur between seasons 2 and 3 of the MLPFIM series.

Twilight Sparkle and her close group of friends are called to Canterlot by Princess Celestia and Princess Luna. An old foe from Celestia's past has returned from exile and plans to attack the castle with a horde of monsters at his beckon call. This diabolical villain intends to control all of Equestria and will stop at nothing to get what he wants. And his name is...

~Spoiler Warning: Events take place after Legends of Everfree and Mirror Magic~

Strange occurrences are happening in the town of Canterlot. Sightings of monsters and magical events have been reported across town with no means of solving them. Starlight Glimmer has been tasked with traveling to CHS and helping Sunset, Twilight, and the other girls in finding the source to these extraordinary events. With the Rainboom's new magical powers and Starlight's help, they will embark on a fun new adventure across town and face an old enemy with a new source of power.