On an excavation, an army has broken free from Celestia's seal. It was led by the treacherous former Prince Bloodless, who overthrew Celestia hundreds of years ago.

In an escape worthy of Daring Do, Professor Hareson escaped with his assistant Lyra, and set off to warn Celestia.

It's up to Twilight Sparkle, her friends, and Hareson to find them and stop them.