Twilight changes Star Swirl's time spell to travel back to the past once more. She ends up in the Pre-Equestrian era and unwittingly saves two fillies in the process. Little did she know what teaching them magic can do for the fate of Equestria.
Scootaloo overhears Twilight talking about a time travel machine. She breaks into the library and travels back in time to meet her hero, Rainbow Dash, as a filly. It would have been the perfect plan if Dash had been anything like she expected.
When a time traveling spell goes horribly wrong, the sons and daughters of the Mane Six are thrown back to when their mothers were still single. Now their very existence is at risk as they try to return home without changing history itself.
This is the story of Discord. His birth, adventures, friendships, and loves. His tragedy, betrayal, exile, and finally his end. This is the tale of a past long forgotten by the pages of history.