Ten years have passed since the awful war that nearly destroyed Equestria. Humanity and ponies now live together in harmony. Yet for Sweetie Belle, not all scars are so easily healed.

When Equestria is threatened with an invasion of all its greatest enemies, Celestia and Luna are forced to turn to the only ally with a chance of helping them: Humans. The only question left now is whether any of Equestria will be left to save.

Lyra discovers a cell phone that has ended up in Equestria. To her surprise, it can send messages to humans!