"The master of the Goblin blacksmiths offered to build the king a golden mechanical army. Seventy times seventy soldiers that would never know hunger, and could not be stopped."So your Mecha-Mooks aren't cutting it? What's the next logical step up from taking the already impressive stamina, loyalty, and destructive power of a mechanical henchman? Simply, you go absolutely off the wall with them. Where the mecha-mook will be a dime a thousand, you'll see only a few, or only one, Mechanical Monster. This may be due to limited resources or simply because everyone involved in making it is no longer amongst the living. They are always improbably hard to stop, incredibly persistent, never needs to recharge and always, always terrifying to look at. Very likely to be the big bad's Dragon, and often times much tougher to kill. It should also be noted, that while the mecha-mooks often are fragile, incompetent, and generally gentle at their jobs, expect the Mechanical Monster to be a far less kind to its prey. Slashing, stabbing, soul stealing to fuel their infernal engines, and loud noises are all par for the course. Mechanical Abomination is when it goes to Cosmic Horror levels. See also Homicide Machines, Our Monsters Are Different, Robeast.
— Tale of the Golden Army, Hellboy II: The Golden Army
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Anime and Manga
- The Monster of the Week Mecha-Mooks in Mazinger Z are called "Kikaijuu", which is made of the words for "machine" and "monster" in Japanese.
- And then you have the Mykene War Beasts ("Sentoujuu") in Great Mazinger, Mykene soldiers grafted into gigantic mechanical bodies. They had shape of humanoid warrior, evil spirit, mammal, bird, reptile, fish or insect.
- The Saucer Beasts and Vega Monsters from UFO Robo Grendizer. They are animalistic mechanical monsters resemble flying saucers pre-transformation.
- Shin Getter Robot is a rare heroic example, at least in the original manga arcs (Its more monsterish aspects get severely toned down in other appearances such as SRW or the getter OVAS)
- Mechasauruses and Mecha Oni play it straight, though: the former ones are robotical dinosaurs, and the seconds are horned, demonic-looking mechanical beasts.
- The standard Monster of the Week in Tadao Nagahama's Robot Romance Trilogy:
- The Mecha Boosts from Zambot 3.
- The Megaborgs from Daitarn 3, although they start out as less-monstrous Meganoids before mutating themselves.
- The Haniwa Phantom Gods from Kotetsu Jeeg: Mechanical monsters animated through magic means and resembling mythological creatures or evil spirits.
- Gola Mosca in Katekyo Hitman Reborn!. It is powered by the Life Energy of the Ninth Vongola Boss.
- The 'oni' from Kakurenbo, which resemble giant animatronic puppets.
- The manga "Seiketsu no Hagurama" had a literal blue-blooded prince and Gadgeteer Genius construct Steam Punk looking machines like a whale-shaped ship and a pilot-ridden steam blowing minotaur whom he thought were being used for peaceful purposes (but were actually used to eradicate the remaining red-blooded people by his father and king).
- Nearly every episode of the American translation of Voltron — both lion-team Voltron and vehicle-team Voltron—culminated in a fight against a giant enemy RoBeast. Once or twice on the vehicle-team Voltron show, these robotic engines of destruction were shown with normal-sized pilots inside. (Since this was a Never Say "Die" translation, the pilots were themselves android stormtroopers.)
- The Pacifistas of One Piece. These guys are made of an incredibly hard material, making them Nigh Invulnerable to typical physical attacks, possess Frickin' Laser Beams in a story that presumably takes place in the 15th century, and share the appearance and physical strength of Bartholomew Kuma, one of the most feared men in the One Piece world. It's said that one of these things is the equivalent of a battleship, and it took all of the main characters working together with everything they had to beat a single one pre-Time Skip.
- Double Subverted after said Time Skip. Two Pacifistas fall victim to The Worf Effect to demonstrate how powerful the Straw Hats are now, proving to be absolutely no challenge for them anymore. However, immediately after that, it's been stated that there are far more powerful Pacifista out there now, though they haven't been shown, nor has it been stated exactly what's improved over the originals.
- Batman has a robot dinosaur in the Trophy Room of the Batcave; a souvenir of a case called "Dinosaur Island".
- In Marvel's toy tie-in comic The Starriors, the title characters are about evenly split between semi-humanoid robots and animal and dinosaur-shaped ones. They're all perfectly sentient.
- Doctor Doom had one, The Doomsman.
- The Transformers features the Guardian Units, which are bright yellow, ridiculously huge by Cybertronian standards, and have a distressing tendency to turn against their owners. They are also incredibly over-powered and very strong, to the extent that even one of them is enough to give Optimus Prime trouble.
Films — Animation
- The Incredibles sported the Omnidroid. Developed and controlled by the Big Bad by evolving the design from pitting it against retired superheroes, the robot is extremely intelligent, fast, extremely deadly, and invulnerable to just about anything except weapons made from the robot's own tough metal.
- The villains from 9 fit the bill, and all of them are appropriately horrific. The Big Bad, the huge, multi-armed arttificial brain thing, DEFINITELY fits the bill.
- The Leviathan from Atlantis: The Lost Empire is a Magitek version of this, somewhere in the vicinity of a couple miles long, capable of staying intact without recharging for thousands of years, immune to direct torpedo hits and equipped with shearing claws and a particle beam-like Breath Weapon. Only one of them still functions by the time the heroes arrive at the gateway to Atlantis, but it's more than enough to trash their sub and kill over a hundred people.
Films — Live-Action
- The title Golden Army from Hellboy II: The Golden Army. Saved from being simple mecha-mooks by their sheer hardiness. And a self-repair function.
- The giant Harvester from Terminator Salvation would most definitely count, as would the semi-humanoid tanks from the earlier movies.
- Godzilla: The original Showa-era Mecha-Godzilla was a vicious alien robot built with the intent of first discrediting, and then killing Godzilla. Powerful enough to battle Godzilla and King Caesar at the same time, the robot proved a match for anything that the more heroic kaiju could throw at it.
- Maximillian from The Black Hole pretty much takes this to horror territory.
- In Red Sonja, the bad guys unleash a killing machine in the form of a robotic alligator. It's completely invulnerable to the heroes' weapons, except for the eyes, which they carve out.
- The most realistic examples may be the small attack "bugs" from Runaway, whose compact six-legged design was based on real state-of-the-art robotic prototypes of the time. Not as formidable-looking as others on this page, but their Zerg Rush tactics and acid-injectors make up for it.
- The Droideka model of battle droid from Star Wars (the prequel trilogy) is this. These fun bots often give the Jedi a run for their money.
- The Warbeast from Death Machine is essentially a ten-foot tall, nigh-invulnerable collection of hydraulics, claws, and teeth. Given that it's creator was very much a Mad Scientist and it's official role would be a "Frontline Morale Destroyer", it's intentional.
- Tash and Zak Arranda are menaced by a simulation of one of these in Galaxy of Fear: The Nightmare Machine.
- Not a straight example, but the Smoke Monster on Lost mixes mechanical noises (cranking, whirring) in with its biological noises (roaring, growling). Because it has no moving parts (being an amorphous cloud of black vapor), it is not clear where any of these noises are coming from. The most popular Fanon theory is that it generates these noises arbitrarily to frighten people.
- If the smoke monster counts, then its grandfather Rover from The Prisoner deserves a mention too. It's a white floating plastic sphere, and acts as a security device for The Village, but it's also alive somehow; it roars and groans and has a mind of its own, even killing the wrong person once.
- Whenever the enemy group in Super Sentai and its adaptation Power Rangers is mechanical in nature, there is a high chance the Monsters of the Week they employ are this trope. Examples are the Machine Beasts of Chouriki Sentai Ohranger (adapted into Machine Empire monsters in Power Rangers Zeo), the Barbaric Machine Beasts of Engine Sentai Goonger (adapted into the Venjix Attack Bots in Power Rangers RPM) and the Metaroids of Tokumei Sentai Go-Busters.
- A very early example of this trope in live action television appears in the Japanese Spider Man where the Monsters of the Week are called the Machine BEMs.
- Warhammer 40,000 has many. Many, many, many.
- The Dark Eldar Talos from Warhammer 40,000 is a heavily armored floating mechanical scorpion acting as their version of a tank that grabs people off the battlefield and pulls them inside itself to slowly torture them to death, which powers its systems and weapons with their agony and souls. On the outside it has various torture implements acting as claws to restrain other victims, then torture and kill them to remove their souls. It also has a cannon in the shape of a tail that fires incredibly corrosive bio-acid.
- The Necrons have the Tomb Stalker, a giant metal centipede with two guns that fire beams of energy that flay you molecule by molecule. If that wasn't enough, it can become incorporeal in order to pursue its targets directly through the labyrinthine halls of the Necron crypts it guards. It can also sense you coming from literal miles away.
- Chaos has a variety of these as well. Chaos Daemons employ hulking brutes fused to a Spider Tank chassis called Defilers, that have cannons both mechanical and organic in nature. They can also use a form of monstrous Mecha which teleports. As well, Juggernauts are basicly half-mechanical half-organic demonic Rhinos.
- Chaos Space Marines have similar bipedal Mecha monsters that were formerly entirely mechanical. They have mechanical dinosaurs with More Dakka called Forgefiends that are armed with Gatling Good or plasma cannons, or a close combat variety. Last but not least a robotic dragon flyer called Heldrakes that have a gatling cannon or a flamer for a Breath Weapon and adamantium claws which can swoop down and slice tanks in half.
- Some of Magic: The Gathering's more impressive artifact creatures easily qualify as this rather than the standard Mecha-Mooks of dragon engines and myr.
- The main villains of the series, the Phyrexians, have the purpose in life of turning all living things in existence into this, and are these themselves.
- Well, in Dungeons & Dragons there are several "constructs" that fit this category, most notably the Hellfire Engine, a Giant Mecha made out of cold iron and powered by (as well as shooting) hellfire and the Anaxim, basically the twisted mechanical abortion produced by a god of the forge getting a little too crazy.
- Warjacks in the Iron Kingdoms are large (seven to twelve feet tall) steam-powered robots used to protect and assist the setting's Not-So-Squishy Wizards.
- Whenever you want to tell your players to go f*** themselves in your Gamma World game, you use the Death Machine, the setting's mechanical equivalent to the Tarrasque.
- Exalted has its fair share of these, such as the Thousand-Forged Dragons and the Brass Leviathan.
- Universal's Horror Make-Up Show has "Eddie", a mechanical werewolf that ends up coming to life and going rogue at the end of the show.
- Some of the monsters in Puzzle & Dragons, especially the higher-level monsters, are definitely this.
- The alien Hunter from Crysis is this qualified with a Quadruped Terror. It's a house-sized Humongous Mecha with a decidedly inhuman design (looking more like a deep-sea crustacean), bristling with Freeze Rays and Wave Motion Guns. It also has several moving parts on its front, which seem to be there only because they look threatening. Also, it can roar.
- The Banjo-Tooie boss Weldar is this trope, albeit in a very unconventional way. Namely, the fact that he is a giant killer welding torch who can electrify the floor.
- The ROB line in Chrono Trigger could be a good example of these. Also, Lavos' core seemed very Mecha-esque.
- Mega Man, being a robot-based series, has its share of these, mostly as Wily Fortress bosses, most notably The Yellow Devil and all the other Devil series robots.
- Omega Weapon from the Final Fantasy franchise is often depicted as this. Other times he's a bio-mechanical monster.
- Castlevania: Lords of Shadow has a giant robot scorpion Brain in a Jar built by Doctor Frankenstein.
- The FuzzBomb from Agent USA used to be a normal television set, until an experiment Gone Horribly Wrong gave it malevolent sentience (with angry eyes!), and it's now trying to turn everyone in the entire United States into mindless, walking TV static.
- Most players wouldn't know what the second boss (Aeshi Nero) of Metal Slug 2/X is when they first see it. It's a gigantic excavator robot designed to look like a cobra.
- Metal Gear Solid 4: Guns of the Patriots: The Gekko are as much life-form as machine; they're about as smart as an animal, make appropriate sounds when they're in distress, and, of course, have organic legs. They also follow the basic use of the Mechanical Monster trope in that they are much more dangerous and intimidating than a simple robot would be.
- Among the many Dwemer Animunculi you run into in The Elder Scrolls series, there is always at least one type of these. In Morrowind, you had Steam Centurions. In Skyrim there are Dwemer Centurions. These things are rare, difficult to kill and can end your quest in a few hits if you are careless. And as if that was bad enough, Skyrim also has the Dwemer Centurion Master. They are twice the size of their lesser brethren and naturally their armor and killing power are doubled.
- The Frost Orca from Mini Robot Wars is a large, whale-submarine bot that spits out deadly ice balls, has a TON of health, is more tenacious than the regular mooks, and acts as a Boss in Mook Clothing. It also practices good dental hygiene.
- Scarabs in the Halo series are controlled by the same alien worms that composes the Hunters, and have an organic roaring sound.
- The Harvester Spider Tanks in Quake IV seem to be partially organic like the aforementioned Scarabs, by the sounds they make. They're easily the most threatening Strogg faced by Kane, being a Mini-Boss when on a vehicle and when on foot, an obstacle to be evaded instead of an enemy to be fought.
- The Meka Dragon in the Wonder Boy series.
- Descent 3 has the Homunculus, which looks like a mechanical version of the Rancor from Return of the Jedi.
- The Mechon in Xenoblade are all walking machines of death and mayhem, but they couldn't be called monsters, at least not individually. Some of them are larger and have faces. The faced Mechon are the ones who could be called monsters but they aren't really machines.
- The Autosaurus Wrecks in SimCity 4. It's basically a T-Rex (or perhaps Godzilla) made of cars.
- One of the Black Knight's twisted inventions, the Moat Monster, from Sly Cooper: Thieves in Time.
- Shantae and the Pirate's Curse has the Steel Maggot (Patent Pending), a giant, robotic maggot that serves as the boss of the Abandoned Factory.
- The Precursor robots from the Jak and Daxter series would count. You also get to encounter the occasional Dark Maker robot in the third game.
- Mass Effect: Reapers go a bit beyond this into "Mechanical Eldritch Abomination", but they'd have to count the few times you fight one on foot - most notably Priority: Rannoch, which famously involves syncing up a target pointer to the biggest fleet in the galaxy and having them rain Thanix projectiles on its weak point.
- The Legend of Zelda: Majora's Mask has Goht, whose title actually is (Masked) Mechanical Monster. It's an enormous mechanical goat-like monster that constantly runs away, and the only way to make it stop after waking it up is to destroy it.
- The Legend of Zelda: Breath of the Wild has the Guardians and the Divine Beasts. The Guardians are massive Spider Tank machines capable of firing extremely strong lasers, while the Divine Beasts are four Humongous Mecha shaped like animals. While the Guardians and the Divine Beasts had been built to protect Hyrule, all of them were literally Hijacked by Ganon 100 years before the game takes place.
- The Renegades in Challenge of the GoBots use Mechanical Monsters called Zods. Cy-Kill's Evil Plan in the Five-Episode Pilot is to obtain the means to build an entire army of the suckers; he succeeds, but they all get blown up by a Chekhov's Bomb introduced earlier. The Renegades continue to use Zods after this, but more sparingly. They also have one called Scales, who can transform into a racecar, but he only appears rarely.
- Transformers has several, including the Terrorcon combiner team, the Monsterbots, the Fuzors and Trypticon.
- The draconic Predacons of Transformers Prime are particularly intimidating in appearance, and possess strength and durability that most normal Autobots and Decepticons couldn't dream of matching. Like Cy-Kill above, Megatron planned to mass-produce his beasts, but he scrapped this plan immediately upon finding out that the Predacons were not the simple creatures he had initially thought them to be.
- The 2015 Robots in Disguise cartoon has nearly all its Decepticons sport beastly robot modes that evoke this. The main antagonist, Steeljaw, resembles a large robot werewolf.
- The old Star Wars: Droids cartoon featured one of these in the form of the villainous Great Heep, which eats other droids to refuel and maintains a droid harem. Later on he is revealed as a member of the Abominor, an entire species of these creatures from outside the main galaxy. They were at war with the Silentium (who are made up of Alien Geometries), which is implied to be the reason for the the Yuzhaan Vong leaving that galaxy.
- One of the original Max Fleischer Superman shorts featured a Mad Scientist with a small army of robots he built to steal for him. They had twisted, ogre-like forms, grasping claws, a stilted range of motion, and eye-mounted flamethrowers. They were even called "the mechanical monsters" (which was the short's title) for good measure!