Sunset Shimmer is a mare of many tales. With her fall from grace as Celestia's Prize Pupil still stinging, she takes opportunity as it comes, and it comes in the form of that which revealed to her, her true destiny. The Crystal Mirror

After months of pleading and begging, Rainbow Dash finally relents and agrees to go with Fluttershy to see the next Butterfly Migration. But as it turns out, the Migration becomes the last thing to cross their mind as the two pegasi are thrown astray