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Main Article: Darwinian Nightmare
Preliminary drafts of Evolution by Don Jakoby elaborated the premise of the story with a much more serious tone compared to the final film. Upon being hired for the project, director Ivan Reitman requested screenwriters David Diamond and David Weissman to shift the script into a comedic adventure sci-fi story, in the same vein as Reitman’s Ghostbusters films. With only a full year before the film’s intended release and a whole alien ecology to bring to life for it, Reitman immediately began seeking the right effects craftsmen for the project. “This wasn’t about one dinosaur,” Reitman said, “or even a bunch of dinosaurs. It was about creating a whole new world.”