Godzilla and King Ghidorah are both fictional monsters starring in Japanese horror movies from the 60s and beyond. Godzilla is a massive prehistoric sea monster that resembles an aquatic dinosaur or reptile. He is awoken by nuclear radiation, and it is rumored that Godzilla was actually a metaphor for the United States after the bombing of Hiroshima and Nagasaki. The monster has appeared and starred in almost 40 movies at this point in time. King Ghidorah is a 3-headed beast that resembles a dragon. He was created to be the archenemy of Godzilla and it's said that he was an omnipotent being from another dimension sent to stop the raging reptile. After 30 years and 18 movies, they finally decided to make Godzilla vs King Ghidorah highlighting their rivalry.