New Providence, an idyllic little town set in the far-western lands of Equestria. Peaceful. Quiet. And home to a terrible secret, one that—were it ever exposed—could shatter not just the town, but all of Equestria. It's a secret that will be exposed in a way none expected when best friend Samantha and Moonbeam have their mothers kidnapped by Changelings.

When the town elders refuse to send a rescue party, Samantha and Moonbeam take it upon themselves to rescue their parents. But they'll need help. And what better help could a pair of teens ask for than a seventy-five ton war-machine from another world?