After seeing what happened when she accidently changed her friends destinies, Twilight is curious about about the 'what if'. Like, for example, what if Luna had ponies a thousand years ago who noticed her.
Five years ago, The Rainbow Factory was condemned by Princess Celestia and many questions were left unanswered as to why. Now, as a filly, starting your first year in flight school, your classmates decided to give you a test to prove your worth.