Milly Alcock shares 'Supergirl' footage at CinemaCon. She learned five alien languages and trained for an hour every da.

Over four decades, the Alien franchise has brought many different versions of the xenomorph creature to theaters.

From the ugly to the awesome to the downright weird, Hollywood has brought a whole cosmos' worth of alien characters to the silver screen — but what do we know about the human beings who portrayed ...