Stranded in Equestria's far past in the body of a unicorn without any magical knowledge, the self proclaimed "Weiss Noir" fights for survival in the Frozen North by indulging in sorcery most foul.
A man wakes up to find he's inhabiting the body of a cartoon horse who wasn't exactly Mister Popular, judging from how shocked the locals are when he says things like 'please' and 'thank you'.
If Ponyville's new repair-pony gets his way, the Mane Six won't even know he exists - and nopony in Ponyville will miss him for long once he's returned to Earth.