When your world is falling apart and fate puts a portal on your path, maybe you should cross it. Life as a pony can't be worse than the literal apocalypse, right?
Oleander and Fred sacrificed themselves to hold back the Predators for long enough for the Hold to be closed, giving themselves up to the whims of the void between worlds. They had no idea it would spit them back out in a world so oddly similar...
Spike introduces his dragon friends to the human world to discover a few of the intriguing intricacies of dog life. They freak out, afraid of their new bodies, forgetting that home is a mere portal jump away. ...Looks like they're in for a ruff time.
Fluttershy's beloved pet bunny, Angel, is commonly appreciated by the ponies of Ponyville to be a rampant little demon. They have no idea just how correct they are.
A small but brave explorer wanders where he should not. The monster he faces doesn't threaten to devour him, but it feels just as bad. Are his people really so... This just can't be.