King Ghidorah is the three-headed rival kaiju featured in Godzilla: King of the Monsters, released in 2019 as part of Legendary's MonsterVerse. Roar clips from that movie spread online through monster edits, versus videos and dramatic meme compilations. The sound stays popular because it instantly communicates scale, threat and cinematic chaos, even when used on everyday footage. Creators often pick it when they want a reveal to feel apocalyptic or when a joke needs a bigger, more villainous payoff than a standard impact effect.