Giant Monster Movies: King Ghidorah

A three-headed giant dragon, King Ghidorah has appeared (one way or another) in multiple Godzilla and Mothra films. Among the most powerful giant monsters in daikaiju eiga and considered Godzilla's archenemy, Ghidorah is so powerful that Godzilla is often required to ally with other kaiju to battle the three-headed monster.

Here is King Ghidorah's filmography, pulled from our master list of Giant Monster Movies:

Ghidorah, the Three-Headed Monster (1964)
Invasion of the Astro-Monster (1965) - (a.k.a. Godzilla vs. Monster Zero)
Destroy All Monsters (1968)
Godzilla vs. Gigan (1972)
Godzilla vs. King Ghidorah (1991)
Rebirth of Mothra (1996) - Desghidorah (a.k.a. Death Ghidorah)
Rebirth of Mothra III (1998)
Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack (2001)
Godzilla: Final Wars (2004) - Keizer Ghidorah

Big Monsters Lists:
Giant Monster Movies
Giant Monster Movies: King Kong (and other Giant Apes)
Giant Monster Movies: Godzilla
Giant Monster Movies: Mothra
Giant Monster Movies: Rodan
Giant Monster Movies: Gamera
Giant Monsters: Ray Harryhausen
Giant Monster Movies: Dinosaurs and Prehistoric Creatures
Giant Monster Movies: Robots and Colossi