Mark Wells only bought an old mirror, so why did he now have hooves, wings and green fur? And where was he? Maybe this great and powerful princess could tell him?
Somewhat confused at the recent turn of events, Alex desperately tries to find his place in this strange, yet familiar land. However, dark powers loom on the horizon, threatening to destroy not only his new home, but his old one as well...
Humanity's space exploration ultimately took the form of billions of identical probes, capable of building anything (including astronauts themselves) upon arrival at their destinations. One lands in Equestria. Things go downhill from there.