Starswirl's unfinished spell didn't swap marks. It merged destinies with other worlds where things happened differently. In a world where it all went wrong, only ponies from the world where everything went right can help.
The Blank Plague has burned out in Canterlot and Ponyville, but one alicorn must still undergo its ravages. But the Princess of Dreams has duties that cannot be left untended, and dreams will not bear the sun's light...
When magic is part of who you are, who are you when the magic is gone? The ponies of Equestria have to find out, while Bellerophon Michaelides nurses their rulers back to health.
When it becomes obvious that Rainbow's number one fan Scootaloo, now a mare herself, is trying to court Spike, Lero's herd is concerned - is Scootaloo truly interested in Spike, or simply trying to follow in her idol's footsteps?