Norse legends tell of men sacrificing bears and bulls to unicorns to keep them from devouring human villages. Pre-equestrian legends tell of a cunning prey prized by unicorn royalty. A holiday fast, commemorating the defense of the wishing star from changeling armies, sharpens Rarity and Twilight Sparkle's appetites just as some very lost Bronycon attendees crash out of the Everfree Forest. Rainbow Dash finds herself wrenched apart by conflicting loyalties. Fluttershy gains, and loses, a pet. Applejack relates to somebody. Spike will execute a cunning scheme, but finds himself torn between the two unicorns that matter the most to him. Pinkie Pie explains why "Cupcakes" is a silly fanfic and tries to quell bloodlust with pineapple inside-out cake.
Friendships will be tested. Hearts will be broken. Secrets will be revealed. Also, magic kindergarten.

When humans come to Equestria, it's not the ponies that should be afraid.