Basically there's this seal - really there were a bunch of 'em that were supposed t'keep Lucifer on lockdown. But this one broke and started draggin' people in here from other universes. Then the rest of 'em broke, too, so now we've got Lucifer wandering around bein' a douche.
...well, yeah, figured as much. Just thought I'd mention that, while I was reminded.
And there's definitely more than just me and you with this face. Two other guys - Leon and Daimon. I've got a pretty popular face, apparently.