A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.
When a human diplomat interviews Twilight, he's in for more than he expected with how strange pony culture could be. Especially over the fact they can't say five words without making a bad pun.
Before Equestria is destroyed, Celestia sends the Elements of Harmony on a quest to find a suitable planet, and open a portal to teleport the nation though. Problem is, it's already inhabitated, and the natives are very restless.
A space military captain, who believes that Equestria resides on the legendary, long-lost planet of Earth, attempts to save Twilight and her friends from an incoming invasion that threatens both Equestria and the galaxy while keeping them all sane.