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Indominus RexThe Indominus rex was a hybrid dinosaur and the secondary antagonist of the Jurassic Park franchise. She was one of the largest existing theropods in the Jurassic World film, as well as the film's main antagonist, the posthumous overarching antagonist of Jurassic World: Fallen Kingdom. The hybrid was created by modifying the genome of a Tyrannosaurus rex with the DNA of various other theropods. It was mentioned that the Indominus rex would be larger than the T. rex when fully grown.
Source : jurassicpark.fandom