When Humanity met Ponykind, things went poorly for humanity. A Unicorn named Prancer travels back in time, and sets out to solve the "Human problem" with a magical virus that'll "take the evil out of Humanity". What could possibly go wrong?
Waking from a nightmare with no memory of what happened, Apple Bloom is shocked. She has become an Alicorn! To find what has befallen her, she seeks advice of Princess Celestia. But the royal sisters have vanished, unfurling a real nightmare!