Mr A T. Towards, petty crimelord and minor magician of no particular note, is finally in the dungeons of Canterlot where he belongs, thanks to the bravery, ingenuity, and relentless determination of Equestria's Finest.

Of course, that's not precisely how he remembers it. And he's not about to rot away in a wet dungeon without doing his damnedest to make sure some...pony gets it right.

Banished from a land of industrial magic and ancient terrors for a crime he... well, actually, he committed it with some considerable panache. Thrown into a broken mirror, passing through the fey realms, and turning up in the land of Equestria does tend to give one a certain change of perspective, however. And this is, more or less, that story.
Mostly.
Probably.

If he can resist the urge to embellish and lie long enough to recite a coherent tale, anyway.