Continued from "And None of them Lived Happily Ever After".

Twilight, Pinkie and Spike have begun their journey in search of the root of what Twilight calls "Shipping Syndrome", a case of emotional development which alters a pony's preferences and causes them to become infatuated with another pony, regardless of gender, and (as Twilight now suspects) regardless of orientation. But Pinkie Pie has already fallen victim to this syndrome, and her obsession is Twilight! Pinkie knows that the feelings are just an illusion, but they're deeply embedded in her mind. Will Twilight be able to keep the situation under control, or will she, too, become corrupted by the syndrome and return the feelings Pinkie has for her?

Find out in "Unfair Shipping" Act II: Star-Crossed Ponies!