Shortly after the fall of Queen Chrysalis, Twilight Sparkle is finally convinced by her fellow alicorns to form her own guard unit.

Hesitant at first, Twilight eventually warms to the idea, and in a break from tradition, forms the first all mare Royal Guard unit.

But what is a guard without a captain? Twilight has somepony in mind, somepony she helped in her lowest moment several years earlier.

Whether Rainbow Dash likes it or not.