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.
Henstridge plays her human self and gets dressed up in some intense alien attire. A lot of her get-up had to do with CGI, but she still had to wear some key components that they couldn't recreate back in 1995 ad 1998.
David Kessler - David Naughton
The 1980s had some of the best horror comedies out there, An American Werewolf in London absolutely being one of them. The freaky film features a ferocious wolf-man who turns out to be a tragic villain. David Naughton dressed up in the wolf suit for this funny take on lycanthropy.