After Twilight Sparkle finds a 'new' portal spell in one of her books she learns to use it and then summons a being from another universe.

Zombie ponies have taken over Equestria. The fate of all ponies left alive rests in the hooves of the Mane Six, The Cutie Mark Crusaders, and Princess Luna. But can they survive to find the cause of this madness?

A lone pony searches for his history, only to find his future, and find some friends along the way.