In Godzilla: King of the Monsters (2019), King Ghidorah was credited as 'himself' but actually had three performance capture actors to help bring his separate personalities to life. The actors were Alan Maxson (right head), Jason Liles (center head) & Richard Dorton (left head).
Each of Ghidorah's heads have different personalities: The middle head is the smartest of the three, with the right head being the most bloodthirsty, and the left head being the most insane.
He is code-named 'Monster Zero'.
He stands at 521 feet (158.8 meters) tall, weighing approximately 120,000 tons, and has a wingspan of over 1,300 feet (396.2 meters).