Long forgotten at the top of the world an ancient prison rests beneath the ice and snow. Built for one purpose, it has held a force of nightmare at bay for over a thousand years. Now the spells are broken, and the nightmare dragon Insomnia has escaped and she is determined that all of Equestria will taste of her wrath. The small town of Glendale must field its best to contend with the dragon, for they are Equestria's first and only line of defense against this great evil.