The Ripple shakes the world in a cataclysmic rupture of time. For a short time, all the separate, disparate threads of time become one and the same. The merging nearly shatters the Central Leyline and destroys all life until a single pony tries to stop it. This is not her story.
Long before the three tribes ever began to war, a single pony traveled to the farthest reaches of the world to search for the truth hidden in the icy North. This was not her story either.
In the distant future, a single pony will embark on an entirely unexpected journey to find out why the sun stopped moving centuries before her time, leaving the world trapped in the endless half-light of dusk. This will not be her story either.
In fact, it's not the story of any single pony.
It's the story of three of them.