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.
Man goes to convention dressed as multiple characters at once. Man purchases a Twilight Sparkle mask. Man regrets his decision as he ends up in a Pokemon-filled Equestria as another Twilight Sparkle. And then, something unexpected... Dawns.
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?