Lyra, Colgate and Twinkleshine have all returned to their normal homes and duties, trying to live happy lives after that little "accident". But what they don't know is that when they were possessed all those years ago, some of of the possession essence lived on inside of them, and soon enough it breaks out again.

Once more possessed, the three background ponies went on a killing spree, slaughtering everypony in sight. And occasionally recruiting some of the survivors into their cause. Will Twilight and Friends be able to stop them before it gets out of hand?