Starlight Glimmer was sent to Canterlot Castle to try and resolve the growing feud between the Royal Sisters. Celestia and Luna's cutie marks were swapped, and each of them tried to do the other's job for a day.

In Starlight's dream, Nightmare Moon and an alternate version of Celestia calling herself Daybreaker fight for Equestria's throne. Starlight fears she made a mistake in trying to show each sister how difficult the other's jobs are. For a moment, Nightmare Moon falls.

Luna has Celestia's magic. She can do nothing to change the dream. Or maybe she can, by talking to her own Nightmare.

An alternate version of the Season 7 episode A Royal Problem. Rated T for villain squabbles.