Rainbow Dash sets out to defeat the legendary witch Twilight Sparkle and collect the five hundred million bit bounty on her head. The one thing she wasn't counting on was Twilight being less evil than she expected.
After Twilight gets her Castle, she tries a spell that she had come across paths with. While in Canterlot, Princess Celestia and Princess Luna found the same spell.
Twilight is turned into an alicorn against her will, paying a terrible price. Now she becomes Equestria's worst enemy, and sets on a journey to uncover her world's greatest secret: The truth behind the nature of the alicorns.