McDiarmid had to undergo hours of facial prosthetics and makeup to complete the transformation into the crazed villain. All that power went to his head and aged him quite a lot!
Sil - Natasha Henstridge
Species is a true alien horror story where humans are the prey. The aliens weaponize themselves in order to mate with and kill humans. Sil, played by Natasha Henstridge, gets away from the United States government and begins her rampage.