William is now Scootaloo's father, but some ponies disagree with an alien adopting a pony...and a certain mare will go as far as she can to make sure the two get seperated.
A human attempts to assassinate Princess Celestia and a few others at an informal ball, apparently acting on the orders of the Changeling Queen. Things go downhill from there.
Nobody knew what happened to the Engineer after the fall of Mann co. As miss Pauling said, he seemed to vanish from the face of Earth. And that is because he did...