David Bowie as Thomas Jerome Newton in 'The Man Who Fell to Earth'; a Xenomorph in 'Aliens'; Scarlett Johansson as the Female in 'Under the Skin' A casual viewer might assume that if you've seen one ...

We may receive a commission on purchases made from links. Are we alone in the universe? It's a huge question with no easy answer. And, following on from that, if we aren't alone, what would beings ...

As the Alien franchise heads into new territory -- both thematically and format..ily -- with the TV series Alien: Earth, we're Weylin' our Yutanis at the seven Xeno-movies that have landed in theaters ...