William has become close to the Apple family. He is almost like another member, in a way. This is why Apple Bloom came to him. Complaining about..."monsters". William, being one with a kind heart, decides to investigate the issue. That decision takes him somewhere he thought he would never be again: Earth.

A secret organization is responsible for this. Are their intentions good, or bad? Whatever it may be, William is determined to escape and return to his daughter, and the mare he loves.