"Due to their reliance on parasitism and unorthodox form of nourishment, there are only 2 foreseeable outcomes for the Changeling race: Their extinction, or ours"
--Twilight Sparkle, "On the Subject of Changelings"

With everyone away on royal business in Canterlot, Shining Armor is left with the seemingly easy task of taking care of the Cutie Mark Crusaders.

He should have listened to Fluttershy.

Now, with the 3 fillies completely out of control on the first of seven nights, Shining must call up an old "acquaintance" to help him out.