What would you do if you've gone where no mare has gone before, and have no idea how to get back?

Rainbow Dash found herself alone in a strange, magicless world governed by entirely different natural laws than Equestria, ruled by a race who thought themselves the only sentient species in the universe...

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.