One escaped Tartarus a few years ago, and I'm assuming the same thing happened in this Equestria. I was part of a super secret spy agency dedicated to bringing it in. I was the one who finally took it down, came to Ponyville when Celestia disbanded our entire agency, had us destroy and shred any bit of evidence that proved we existed and assumed the name Bon Bon.

...She's the one who drinks too much coffee, right?