The big draw and main antagonist of Jurassic World is the genetically modified hybrid mutant dinosaur created by the park's mad scientists: indominus rex. Things don't get off to a good start with the new attraction when she's bred along with a sibling, whom she promptly eats. Although apparently the frantic scratch marks of the other rex trying to escape its murderous sibling wasn't enough to put them off. The I-Rex is kept around regardless, before she promptly escapes. Obviously. It's not a Jurassic Park film is everything doesn't go wrong, usually involving the dinosaurs breaking out. Here the threat is bigger than ever, with the genetically engineered dino killing for sport, eviscerating a whole field of brontosaurus for no real reason. That's pretty scary.