Princesses Celestia and Luna sense a strange anomaly in the ruins of Everfree Castle, unaware that the young Alicorn that caused it was thought to be a long-lost memory. His arrival will have a profound effect on both of the Royal Sisters, and all of Equestria. What follows is an epic adventure that will take him, the Mane 6, and assorted guests, to the gates of Tartarus and back.

(For the record, I realize how Mary Sue-Tastic it is to have an Alicorn OC. That was not my intent. I just wanted to try to come up with a valid reason for why one would exist and make it at least somewhat believable.)