As a fan of the show, I always loved Rainbow Dash and her cutie mark, but I never wanted it to appear on my leg! Now that it has, all sorts of things are getting weird around here. I'm a guy, not a mare! Cartoon ponies aren't real... right?
Novel Tale, a changeling living in Canterlot as a writer, has his peaceful life shattered when changelings from another hive attack, revealing the existence of changelings to all of ponykind. And his last book had a changeling character in it...
After the royal wedding, a new changeling hive makes its presence known and wishs to open diplomatic relations. Twilight decides to use this opprotunity to learn more about them, but ends up getting far more than she bargined for.
After the harrowing events of "Traveller," the Doctor is forced into having some downtime in Ponyville while the TARDIS rests. Meanwhile, Twilight goes to confide in her beloved mentor, but ends up learning far more than she expected.
Trixie appears once more in Ponyville, babbling about how she is supposed to be the Element of Magic and how Celestia is the evil Tyrant Sun. Has she gone insane? Or is something larger happening?