Artist Gillis recalled his involvement in the project saying, "We were involved in everything from designing and sculpting the aliens to supervising a crew of about thirty people. We sculpted the main characters, supervised the molding and production of their appliances and oversaw the sculpting of the secondary and background characters." During the design phase, the producers supported the subtlety of the makeup and trying to make the aliens look as human as possible. Hurd explained, "We wanted the aliens to be more like a different ethnic race than like lizard people..." She added, "We didn't want our audiences thinking, 'Gee, look how different these aliens are.' Rather, after about five minutes we wanted the audience to accept them as different from us, but not "so" different that no one is buying the storyline. We wanted the aliens to be characters–not creatures." A preliminary design sketch for the aliens as described by Mahan, was that "the males were going to have spines on top of their heads–kind of like a rooster's comb–and when they got angry, these spines would raise up. That would've required a mechanical headpiece, and Graham Baker thought it was a little too extreme so we went with smooth heads instead." Coming close to a final design for the headpiece makeup, Woodruff explained how the masks had "heavier brows and a heavier skin texture that looked more leathery, and there were more pronounced lumps on the backs of their heads. After we went into production on these masks, Graham Baker decided that he wanted the aliens to look even more subtle, so we streamlined the design once we started doing the principal characters." Mike Spatola was head of the painting crew for the mask design. Hairless by design, the coordinators felt the masks should have spotted marks where hair would be present on humans. Each alien headpiece had to be custom painted with a spotting pattern to match every backup secondary piece used for individual characters. Each of the actors who played aliens also had their hands painted in a spot pattern, as an original plan of supplying them with appliances for hand pieces was discarded. After the generic alien concept was finalized, each of the effects coordinators worked with a specific actor. Mahan chose to work with Mandy Patinkin, as well as Francisco's son. Rosengrant worked with Leslie Bevis who played Cassandra. Woodruff worked on Terence Stamp who played the part of Harcourt. In trying to emphasize the uniqueness of the characters, Mahan commented, "We wanted the audience to be able to recognize the actors immediately.