The Indominus Rex was created for Jurassic World in 2015 as a genetically engineered hybrid dinosaur designed to be bigger and scarier than the T. rex. Its roar was built by sound designers layering big cat growls, ape calls and other animal vocalisations to sound unfamiliar and unnatural. Clips of the roar later spread through YouTube edits, dinosaur games and meme videos, where it became a go-to sound for any oversized predator. It remains popular because few dinosaur roars sound as distinct or as threatening.