One year has passed since the defeat of the Terrible Trio. All of Equestria thought that they had finally achieved peace, prosperity, harmony, justice and unity. Or so they thought....

An ancient evil has came back (the real one this time) after many years, and he seeks the ultimate vengeance. As he recruits the most vilest of the vile, the most vicious of all vicious and the most violent that even beasts cower in fear, is Equestria ready to take it on one final time?