When Twilight's portals release Tirek into the human world and the humans get turned into ponies, they have to unite with their ponyselves to defeat him and save both world's.
Sunset as the rest of Equestria is looking forward to the summer sun celebration until the main attraction goes missing and Sunset is determined to get her back.
On their way to attend a perfectly ordinary, perfectly boring midnight flower show hosted by the Princess of the Night, the Flower Trio become unwitting pawns in a supernatural plot.
Three florist ponies and a Roselia endure a frighteningly changing world as they encounter the good and the bad of both sides of it, one another, and themselves.