Prior to the soft-reboot reinvention by Colin Trevorrow under the title "Jurassic World", writer John Sayles completed a script draft in 2004 for a fourth installment in the "Jurassic Park" franchise. Although the project was ultimately canceled for being too outlandish, the script featured ideas that were eventually repurposed for later sequels, most notably, the creation of hybrid dinosaurs with human genes trained as mercenaries.
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