In the aftermath of a huge explosion in the Everfree Forest, Ponyville soon finds itself as the new home for Lucario, an "Aura Pokemon" from another dimension. While he avoids explaining what has happened to him and where he came from, he repays his new friends' kindness by protecting them from the evil forces that suddenly appears around Equestria.

Meanwhile, a certain princess of the night watches his every move, unable to judge if this new visitor will bring safety or utter destruction upon the land.

(This story primarily takes place between season 2 and season 3. Elements from season 3 and beyond may occur, but won't have a significant impact on the plot.)

King Sombra’s dark influence was obliterated by the Crystal Heart, and the villain is well and truly dead. But when he attempts to steal the afterlife of an innocent victim, a human spirit is left hurtling towards Equestria, where this unfortunate soul is revived into the only vessel available: the reconstituted body of King Sombra himself.

Thus, a cheerfully oblivious alien is crammed into the form of the most evil and malicious being Equestria has ever known. Not that Shining Armor and Cadence know this, of course. As far as they are concerned, the King is back and he’s lost his fricking mind.

Click here for the TV Tropes page!