Monster finds problems fitting in and getting used to her new world in Ponyville. To help adjust, she reaches out to Princess Luna who has many of the same problems now that she is recovering from being Nightmare Moon.
While trapped in another world Ditzy gets to know the version of herself and her daughter that lives there. Are they better or worse off than she is? Can she learn anything from the path their lives have taken?
Myths and Birthrights side-story: Velvet Sparkle recounts her younger years in a nation north of Equestria and the events leading up to her becoming the mother of Shining Amour and Twilight Sparkle
After Celestia humiliates her at a dinner, Luna storms off and ends up snooping around in her sister's room. There, she stumbles upon the journal Celestia kept immediately after the banishment of Nightmare Moon.
Twenty years before the Elements of harmony, before Nightmare Moon's Return, Celestia started a whole new slew of problems and headaches for herself and the ones around her. Thankfully Cadence doesn't mind foalsitting.
Scootaloo overhears Twilight talking about a time travel machine. She breaks into the library and travels back in time to meet her hero, Rainbow Dash, as a filly. It would have been the perfect plan if Dash had been anything like she expected.
In the final years of her imprisonment, Nightmare Moon was still plotting, but she wasn't returning alone. Behold, the Heir of the Moon! MLP/HP crossover