The Rainbooms and their Ninja Allies from New York are thrown into another dimension with their enemies the Kraang and must join forces with the Dark Knight to stop them and return home.
Derpy's life takes a whole new direction when she is given a once-in-a-lifetime opportunity. But where will this new journey take her, and who will she be at the end?
The Dark Pony of the Night, Mare Do Well is out hunting the musical villain Music Mull who wants to control the whole world with his mind control singing and this number is abut how he feels about Mare Do Well making him and everypony else unwell.