Vinyl Scratch finds someone who might be her sister, but as she turns to Twilight Sparkle to see if it's true, she is unable to help. Vinyl is still curious, so she goes on a quest to see who she and the newcomer really are.

As tensions grow high, a simple dispute sets the stage for an all out war between pegasi, unicorns, and earth ponies. Meanwhile, Fluttershy is trying to play neutral and runs into an issue she must handle on her own.