Bakster
leave the aliens outside.
Uhm, er, were our Timmy to show up at your doorstep, he'd be a non-immigrant alien.
At least under US law, that is.
Extra-terrestrials would have to make appropriate visa arrangements. (Which is probably what all the crop circles are about.)
Hmm, I wonder if Immigration Services has an official opinion on extra-tempora visitors, human or otherwise . . .
[goes of to ponder, gets distracted by 2" ribeye waiting for tomorrow]