A particularly stubborn human is lost in Equestria and is trying his damnedest to find a way out, while surviving the surprisingly difficult rigours of life in a land filled with cute talking animals. Hilarity ensues.
Right before the Elements struck, the Nightmare unleashed a spell out of desperation. A substitution spell. Otherwise known as the correct use of Kawarimi.
Chrysalis has been driven out of Canterlot, her invasion defeated. However, an old friend from her time before coming Queen is more than happy to help her succeed with her plans.