King Ghidorah is a three-headed dragon with the power to unleash electricity through his three heads. Ghidorah first appeared in Ghidorah, the Three-Headed Monster, where he fought Godzilla, Mothra, and Rodan, under the name Ghidorah. He would eventually become Godzilla's Arch Rival, as he became his opponent in Godzilla vs. King Ghidorah, under the name onward, Ghidorah. Eventually he met Bowser, and his Koopa family, and joined his team. King Ghidorah is both powerful and dangerous to his enemies. Ghidorah is one of many ancient evil dragons manifesting within its original form, three bat like dragons called the Dorats. After Bowser discovered them, and took the creatures in, he learned that the creatures were specialized in terror. The Dorats didn't know what Bowser had in store for them after discovering this, from further discoveries of deterioration, he combined the three, and fused them from the Chaos Emeralds, and created King Ghidorah.
- King Ghidorah will become Pooh's enemy in Winnie the Pooh vs. Ghidorah, the Three-Headed Monster.
- Aaron will face this dragon in the future.
- Arik will also become King Ghidorah's enemy in the future as well.
- He has a relative named Desghidorah.