After finding pleasure in killing a mare, Pinkamena becomes Ponyville's own serial killer. When she discovers that Fluttershy has also taken a liking to murder, the two become murder buddies as they torture and brutalize to satisfy their bloodlust. As if two killers weren't enough, the pink mare manages to corrupt young Scootaloo. All seems to be going well for the psychopaths, but two killers in one small town is likely to draw attention. And, a couple ponies have noticed something strange is going on...

Dedicated to NightSoul for making "The X Series" what it is today.