What happens when Spike gets betrayed by Rarity by turning him down for another stallion? With a mending heart and lost memories he sets out to seek revenge on the mare that broke his heart and to torment to any pony that gets in his and Nightmare's way! Beware of Spike the Dragon!

One day Twilight Sparkle decides to study the darker side of magic. Spike sends a letter to Princess Celestia and Princess Luna, and they take action at once! Trying to confront Twilight about the darkness that this magic brings, twilight snaps in a darkening fury...and attacks the Princesses.