Humans have never had a First Contact with any alien race go well. But when a probe sent to a distant star finds a geocentric world populated by ponies, they just cant help but take a look.

A Changeling sorceress to breaks out of prison to travel to Ponyville and bumps into a minty green mare along the way whom she totaly hits it off with.

Twilight and Rainbow must raise a filly who is symbiotically bound to a spirit like alien and attempt to make sure the filly and her ethereal counterpart become a force for good in Equestria.

A shapeshifting alien travels to Equestria in pursuit of a loved one and winds up within a Changeling hive, and after foolishly disguising herself as a changeling looses herself to he hive mind. What awaits the new Changeling One of Four?

Scootaloo makes a new friend, an Artificial Intelligence who claims she can help Scootaloo fly at last using the power of science and a dash of magic to make a powered flying exoskeleton. But in Equestria there are concequences for such science.