King Ghidorah is a three-headed monster from "Godzilla." He is often considered Godzilla's greatest archenemy.
In Courage the Cowardly Dog
In Nowhere TV, when Le Quack turns on the TV, it shows Ghidorah shooting out fire. He also appears in Courage in the Big Stinkin' City, when Courage opens a door in the abandoned building and Ghidorah is behind it, giving a loud roar, which scares Courage.