Honestly, I wouldn't believe me, either. [ It's pretty wild, and Dipper didn't even mention the UFO under the town. There's plenty more where that came from, Hiro. ]

As far as we know. He couldn't have escaped back to his universe, so if he's out there anywhere still, it's...limbo or something, I guess. But I don't think he's going to be causing trouble anytime soon.