Revealed: the human faces behind your favorite movie aliens

If you saw the actor who brought the Predator to life walking down the street, would you recognize him? Probably not. Because behind every alien and beneath every sci-fi mask, there's a human actor or actress we never get to see on screen.

Ever wonder about the humans hiding in plain sight? Here are just a few of them.

If you want to meet more, head over to Chicago Now for a gallery of sci-fi's most famous unseen faces.

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