"We must never forget our pasts, for the choices made then effect who we have become." -Princess Chrona.

Part 1 of 5. After receiving a letter from a past thought to be forgotten. Celestia calls on her faithful student and her friends to go out and save Equestria once again. What they find is that the princess has been hiding a secret that will shatter the foundations of their world setting in motion a chain of events that will awaken an ancient foe of the Alicorn's.