Like many other aspects of Alien³, the creature effects department was plagued by constant changes in direction and contradicting studio decisions. Gillis recalled in an interview with Fangoria: “Fox never had a problem with coming back and saying ‘sorry guys. We know you built these things, but there’s a new direction, and we’re not going to use them’. We had to keep ourselves and the crew orally afloat, because people put their blood, sweat and tears into the stuff, and have a tendency to get upset when an effect’s cancelled. There were six stages of Aliens, count them! But we’re not griping about the script changes, because any story should constantly be honed. That only shows us the film’s getting better, and if the effect doesn’t serve the plot, then there’s no reason for it.” Even though Giger’s Alien designs for the third film were not used as he conceived them, some of their characteristics made their way into the final creatures devised by Amalgamated Dynamics. First to appear in the film is an Egg, placed ambiguously in the Sulaco — built as a static model, as the only sequence showing it was a very late addition to the film.
Alien³ underwent a long, articulated creation process — which saw several scriptwriters elaborating their own screenplays, only to be replaced — one after the other. Going from William Gibson to David Twohy, the film only began to develop to the next step with Vincent Ward and John Fasano’s script. It was based on that story that concept artists Stephen Ellis and Mike Worrall elaborated their own designs for the creatures, which included a woolly Chestburster born from a sheep, and an adult Alien whose origin was left unexplained. Those very initial concepts were conceived more as placeholders to illustrate certain sequences in the script, rather than actual designs.
The fourth — and as of now, final — chapter in the Tremors series depicts the Graboids first attacking the city of Perfection (then called Rejection) in 1889, 100 years before the first film. When discussions about the projects began writer Steven S. Wilson met with Universal executive Patti Jackson. “I told Patti that we were really in a corner,” Wilson told Cinefex online. “The fans were going to want a new creature, but we had no idea where to go. We couldn’t just keep doing the same movie over and over.” He then added: “we’d have to do something wacky this time, like set it in the Old West.” Jackson’s response was concise: “that’s fine.”