*The vast majority of aliens seen on Star Trek: The Next Generation are actually actors wearing prosthetic devices of some type. Whether an episode calls for Klingons, Romulans, Vulcans, Anticans, Ferengi, Binars -- or some of each -- they must all be created here on Earth. The standard process consists of sculpting the alien prosthetic out of clay on a mannequin head to achieve the desired look. The next step involves making a casting of the actor who will wear the prosthetic, and then resculpting the clay pieces to fit the casting of the actor. Next, a mold is taken off of the clay pieces, and new pieces are cast in silicone rubber. These pieces are then applied to the actor with an adhesive and blended with make-up to achieve the desired effect. *Source: Back of card