When a new world joins Equestria on it's magical leyline, The Princess has to send somepony to make sure they'll be friendly neighbors. Who better than the Elements of Harmony? Only able to send two, Twilight and Rainbow Dash bravely volunteer to venture out to study a new world, risking losing both magic and wings for Equestria.
Of course, the new world looks fine at first. They make a few new friends, and find it a nice place. This is the story of two equestrians discovering Earth, with it's culture and it's many differences.