Across a large bridge of stone lies a cave. This cave is a magic cave, which none have ever come to see. Noone knows how this cave came to being, or what is inside, but all they know, is that should something come in..it never comes out…

Twilight and friends were sent into this cave per Celestia's directions, and through this, they learn about a past they never thought possible, each pony living with an extremely ancient ancestor of another time, all brought to the cave through one evil Alicorn.

(I wish I could use a bit more tags then I'm allowed to give you a feeling of what's coming ahead, but I can't…)