Director Paul W.S. Anderson was very happy with the old-school practical approach of visual effects supervisor John Bruno. He jokingly stated that if possible, Bruno would try breeding real Predators and Aliens; if that failed, he would first rely on Alien and Predator suits, then on animatronic effects, before considering computer-generated images (CGI). Such was the blending of traditional and modern techniques that they often appear seamlessly within the same shot or frame. For example, in the shot where the Alien jumps on Celtic, both the Predator and the Alien were played by stuntmen in suits; only in the first frames where the Alien launches itself off the wall and the last frames where it lands was the Alien digitally replaced by a CGI effect. In the climax, as the Queen threatens Scar, the Predator is played by a stuntman in a suit, the Queen is a remote-operated animatronic, and her tail is computer-generated.

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