The Sequel to Number 12.
The Doctor and Twilight leap into the future, though it may be a far darker place than they envision. In the mean time somehow the Doctor keeps crashing around Ponyville, something to do with Fluttershy, but what?

In her youth, Twilight Sparkle discovered a way to infuse technology and magic. 20 years after her breakthrough, she is now the CEO and founder of Sparkle Industries, and one of the wealthiest ponies in Equestria. Her relatively perfect life goes sour, however, when she is captured by a group of griffons who want to steal her technology.

A blue box has fallen out of the sky, and crashed right into Twilight's Library! A strange brown stallion, calling himself the Doctor stumbles out. Soon after, strange stone Pegasus are everywhere, one of resident weather ponies has vanished, and Twilight is tossed in the middle! The Doctor and Twilight have to find out what's going on, before it's too late!

Twilight preforms an old ritual from a recently purchased book. It's supposed to summon a friend, but she had no idea it would be inanimate, so she thought. The Aperture Weighted Companion Cube will befriend anyone that loves it. Even if it does harvest the souls of dead test subjects.