The Indominus Rex first appeared as the main antagonist in Jurassic World, the 2015 film that revived the Jurassic Park franchise. The genetically engineered hybrid dinosaur, created in the film by combining Tyrannosaurus rex DNA with other animals, became instantly recognisable for its size, intelligence and terrifying roar. Clips of its roar spread through dinosaur edits, movie reaction videos and gaming content on YouTube and TikTok, where creators use it to signal danger or a powerful entrance. It remains popular because the sound instantly evokes the film's most intense moments.