Ghidorah

"If Gigan is the hammer of the Vortaak invasion forces, then King Ghidorah is the anvil. King Ghidorah is the most physically powerful monster in the universe, and blends immense size, incredible strength, and near invulnerability into a unified engine of monstrous destruction. The Vortaak often hesitate to deploy King Ghidorah at all, lest he demolish their enemies and leave nothing to subjugate. King Ghidorah is at home in the vacuum of space, and travels between planets under his own power. King Ghidorah's wings allow him to fly in Earth's atmosphere, though his great mass hinders his aerial mobility. He naturally generates intense electrical energy that he unleashes as a powerful Triple Gravity Beam from his three heads. Despite all this, King Ghidorah's greatest ability is his asset to withstand damage-all known forms of attack splinter against his thick golden scales."

"Mecha-King Ghidorah is the GDF's best attempts to use the weapons of the Vortaak to defend Earth, rather than destroy it. After King Ghidorah's defeat at the hands of an Earth Defender in one possible future, the alien monster was rebuilt with GDF technology to serve the interest of mankind. To replace King Ghidorah's natural body armor, destroyed in the re-animation process, this new incarnation has been outfitted with a powerful energy shield to reflect weapon attacks. In addition, Mecha-King Ghidorah has replenishable taser weapons, which can drain an opponent's energy reserves. With most of his original form's combat techniques intact, Mecha-King Ghidorah might stand as humanity's best hope against the Vortaak invasion."