When Starlight Glimmer is invited back to her old town for the Annual Sunset Festival, Trixie is brought along with her for support (as the whole idea of Starlight visiting her old town clearly worries her). After a rather overwhelming and unexpected experience, Starlight and Trixie abandon the visit all-together and return back to Ponyville. Although, what's more worrisome is that upon their return, they find that the Mane Six are acting extremely strange and out of character. Starlight, confused and saddened, does not understand why the Mane Six are acting in such an insensitive way. Although, that night, after princess Luna visits Starlight in a dream, it is clear that the problem is far worse than expected leaving only Discord, Trixie, Starlight and Thorax to prevent what is clearly an attack on pony-kind.
—Fluttershee