The royal court of Canterlot welcomes its newest member with open forelegs: the human philosopher Voltaire, from Earth.

On Earth, Voltaire is known as the greatest enemy of tyranny in the history of literature, and a legend in his own mind.

On Equestria, the court betting pool is giving him a week before the Princess banishes him to the Moon.

Note: This story doesn't have sequels per se, but there are a couple of short follow-ups set in the present day ("Parade Coverage" and "Secret Histories"), and a prequel of sorts in "At the Inn of the Prancing Pony".

TV Tropes page.

Miss Cheerilee tells her class that the legend of Nightmare Moon's return is no emergency, and that the Princess will protect them all. Everything will be just fine.

A re-imagining of the core story of the canon show as though it has originally been targeted toward older audiences (this entails humanization).