Also known as: King Ghidrah, Ghidorah, Monster Zero, the Astro-Monster

Description:

King Ghidora is probably the best-known Godzilla enemy. The three-headed dragon has starred in more films than any other enemy. He is also one of the strongest and hardest to defeat. King Ghidora first appeared in Ghidrah, the Three-Headed Monster. It took three monsters just to defeat him. Or, take his role in Destroy All Monsters: it took seven or more monsters just to defeat him. His most recent appearance was in Godzilla vs. King Ghidora (1991). Ghidora was killed, and his middle head severed from the body, but one of the Futurians used 23rd century cybernetics to revive him into Mecha-King Ghidora, who flys back to save Japan from Godzilla's attack. He carries Godzilla to sea, and falls in with him. Mecha-King Ghidora never again is seen, though Godzilla awakens. With his three heads, brute strength, and magnetic force beams fired from his mouths, Ghidora is definetely Godzilla's deadliest enemy.

Filmography:

Ghidrah, the Three-Headed Monster (1964)

Godzilla vs. Monster Zero (1965)

Destroy All Monsters (1968)

Godzilla vs. Gigan (1972)

Godzilla vs. Mechagodzilla (1974) (Yes, he is there. E-mail me and I'll tell you where, if you can't find him.)

Terror of Mechagodzilla (1975)

Godzilla vs. King Ghidora (1991)

C - Cretaceous King Ghidora

Height: 40 meters
Wingspan: 50 meters
Mass: 25,000 tons
Powers: Plasma fire, regeneration

Cretaceous King Ghidora is the prehistoric form of Godzilla's famous foe, King Ghidora. He used to feed on dinosaurs (T-Rexes were his favorite) before Mothra Leo fought him in a battle royale and hurled him into a volcano, allowing him to fully enjoy nature's wonders. However, a piece of his tail fell off and regenerated into a new Ghidora over eons of concentrated time. 
 

D - Death Ghidora

    Body Length: 100 meters
    Mass: 75,000 tons
    Wingspan: 80 meters
    Powers/Weapons: Energy bolts, Breath fire, can absorb energy
    First appearance: Mosura (1996)

   Death Ghidora's exact origin is unknown. It is a monster from space that went from planet to planet absorbing all the energy. A race of gargantuan prehistoric Moth creatures managed to trap and imprison it. This happened 65,000,000 years ago. Death Ghidora had just sucked Mars dry before coming to the Earth. In 1996 it came back, released by the evil fairy Belvera. He absorbed the life out of a whole forest. Using his new strength, he defeated the adult Mothra, who died to protect her son, Mothra Leo. Leo survived and made a home as he transformed to Mothra Leo, adult. He then defeated Death Ghidora.