It is the destruction of Earth. A group of men manage to put together a spaceship to save them from imminent destruction. They travel light years to find a new planet to live on, and when they do, they find something they don't expect to. They end up on Equestria and must find a way to live in peace alongside their new colorful equine neighbors.

It starts out mostly focused on the humans, but I promise it gets to more ponies at the end. Another thing, I update the google docs version first so use that if you want to read more. It is unedited though.

Twilight Sparkle receives a package for advanced magic. She tries out a spell, and instead of doing what she wanted it to do, she accidentally had all 6 ponies switching bodies! Now they must figure out how to live in each other's shoes while they figure out how to switch back.