Nah, he's from a world thousands of lightyears from here. Earth is a popular hideaway spot for renegade criminals; they seem to think that because humans in this century haven't ventured past their own moon that it'll stop their pursuers from actually pursuing them, not realizing that agencies like Torchwood exist to do the tracking down for them.

[ in most cases. there are still those who don't bother to make contact and just descend upon the planet without a care for the damage they'll do in the process. ]

And then you have those who come here for fun. You wouldn't believe the number of times I've had to tell some teenager taking their parents ship out for a joyride to get out of the atmosphere because they were spooking the locals.