Metal Gear

The Metal Gear is a brand of robot found in the Metal Gear Solid series, and usually the final boss. It will also be featured in the Shadow Moses Island stage of Super Smash Bros. Brawl. Occasionally, one of the Metal Gears will emerge from the background: Metal Gear REX (from Metal Gear Solid), Metal Gear RAY (from Metal Gear Solid 2: Sons of Liberty) and Gekko (from Metal Gear Solid 4: Guns of the Patriot), but they do nothing.

Metal Gear RAY
''An amphibious Metal Gear developed by the U.S. Marines. Revisions to the prototype enabled mass production and made it a viable battle weapon with massive firepower and remote operation. Wings and a tail make it look monsterlike, but scarier still is the high-pressure water cannon in its mouth that fires a stream of water that can slice through rock.''

Metal Gear REX
''A war machine of ruinous power. Metal Gear REX was developed at the weapons company ArmsTech under the eye of Hal "Otacon" Emmerich. It had the ability to launch nuclear warheads from a mounted rail gun. During testing, REX was captured by FOXHOUND, a rogue special-forces unit headed by Liquid Snake, but Solid Snake managed to destroy the machine before calamity ensued.''

Gekko
''A Metal Gear with a pair of animal-like legs. Gekko are mass-produced weapons used in military combat. Its distinctive legs allow Gekko to move at high speed, jump incredible distances, and even cling to walls, giving it unprecedented mobility. Other noteworthy features of this model include prehensile tentacles strong enough to pick up soldiers and its signature deafening roar.''