Rainbow Dash finds a maimed, unconscious young colt on the edge of Ponyville and rushes him to the hospital, but nopony knows who he is and something about him seems off...
Quietly, Sunburst has pined for Twilight Sparkle. Though his feelings run deep, his words fail him. He knows love isn't his expertise, so to resolve things he goes to the best - the changelings.
After teleporting, Twilight is trapped, devoid of magic, in a pocket dimension full of corpses. At least she has a friend though. Twilight, meet Twilight.
What does it mean to be a Changeling? To the former human Prince Phasma, that means doing what you can to survive and thrive in an utterly alien world.