Alien 3 relied heavily on practical effects and inventive in-camera techniques to bring its creature to life. Tom Woodruff Jr. and Alec Gillis’ Amalgamated Dynamics (ADI) were involved to do the practical effects of the film. Even before filming began, ADI started developing Alien models, puppets, and victim corpses, while Boss Film Studios handled compositing and post-production. David Fincher wanted a more animalistic Alien, closer to a puma than a humanoid. H. R. Giger redesigned the creature