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Mech vs. Beast

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"To fight monsters, we created monsters of our own."
Raleigh Becket, Pacific Rim

Oh no, a Kaiju is attacking the city! Bullets are useless, tanks just get stomped, an air strike would cause too much collateral damage... Guess it's time to bring out the Humongous Mecha to punch it in the face.

The idea that it might produce less collateral damage tends to be belied by the buildings smashed by both combatants in their battles. Doesn't really matter though, because watching a giant robot fighting a giant monster is the basic epitome of Cool vs. Awesome.

A Sub-Trope of Flesh Vs Steel and Behemoth Battle. Compare Animal Mecha and Robeast, where it's a combination of a mecha and a beast.



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    Anime & Manga 
  • The movie UFO Robo Grendizer, Getter Robo G, Great Mazinger: Kessen! Daikaijuu has these mecha (from different shows) allies to battle a giant prehistoric monster (even bigger than them) surviving unknowingly in the depths of the oceans.
  • The Big O. Several episodes involve battles between the title Humongous Mecha (piloted by Roger the Negotiator) and a giant monster.
    • Episode 3 "Electric City". The Big O must battle a giant monster (known as the Eel) that lives in the lake behind a hydroelectric dam.
    • Subverted in Episode 5 "Bring Back My Ghost". It appears that Big O will have to fight a giant monster that appears in fog by a river, but the monster turns out to be a light illusion projected by a megadeus instead.
    • Subverted in Episode 7 "The Call from The Past". A large aquatic monster called the Sea Titan threatens the fishing industry and it looks like the Big O will have to battle it, but it turns out to be, yes, another false image produced by a megadeus.
    • Episode 8 "Missing Cat". The Big O must defeat a giant genetically engineered monstrosity known as the Chimera.
    • Episode 11 "Daemonseed". A giant tree grows in Paradigm City and starts destroying buildings with its animated roots. The Big O attacks it for a while, but the tree stops growing by itself and doesn't have to be killed.
    • Episode 22 "Hydra". The Big O confronts a gigantic monster known as the Hydra Eel. It appears to be related to the "Eel" monster the Big O fought in Episode 3 "Electric City", but has three heads. Like the Eel, it uses electricity as a weapon.
  • Neon Genesis Evangelion: The eponymous EVA mechs are used by NERV to fight Angels, which resemble weird giant aliens with no uniform appearance. The only thing that qualifies them as "Angel" is that they have a "blood pattern blue" (which, despite its name, is still red). However, it's played with because the EVAs are not really robots, but actually cloned Angels in a mechanical restraining bolt.
    • In Episode 7 a competing agency tests an automated nuclear-powered mech, but a malfunction or NERV sabotage causes it to go haywire, necessitating EVA 1 to stop it making it something of an inversion.
  • DARLING in the FRANXX: Giant robots called FranXX are piloted to fight Klaxosaurs, weird bright blue Kaiju that feed off "magma energy" in cities. The line gets blurred later, when Klaxosaurs turn out to be biomechanical hybrids... and FranXX are essentially a surgically altered Klaxosaur husk.

    Films — Live-Action 
  • Aliens has a fight between a power-loader (basically a Power Armor forklift) and a xenomorph queen.
  • Avengers: Age of Ultron: Tony Stark in the Hulkbuster armor vs. a mind-controlled Hulk. They may be a bit smaller than other examples but the destruction is devastating all the same.
  • Godzilla: The second and third Mechagodzillas were built by the UN to fight Godzilla and similar Kaiju. The first one was a Godzilla impersonator built by aliens. Godzilla Vs Spacegodzilla also had MOGUERA (first introduced in The Mysterians), who helped Godzilla defeat SpaceGodzilla.
  • King Kong Escapes has King Kong versus Mechani-Kong (who actually predates the more well-known Mechagodzilla by about eight years).
  • Pacific Rim is this trope personified. With an entire (defunded) international corps of two-pilot mechs called "Jaegers" for the express purpose of fighting the alien Kaiju coming out of the Pacific ocean.
  • Likewise, the low-budget knock-off Atlantic Rim, mostly known for getting riffed in season 12 of Mystery Science Theater 3000.
  • In Gulliver's Travels (2010) the Liliputian villain builds a steampunk mech a head taller than Jack Black, and strong enough to give him a wedgie.



    Live-Action TV 

    Tabletop Games 

    Video Games 
  • The sequel of King of the Monsters replaced the King Kong Copy character Woo for his Mecha counterpart called Cyber Woo, which became so famous that it received an appearance in NeoGeo Battle Coliseum in a human-like size, being controlled by a Child Prodigy.
  • Inverted in Mass Effect 3 when Kalros, the semi-mythical mother of all thresher maws, is summoned to fight a Reaper Destroyer.
  • At one point in Neopets, a robot named Mechachiazilla tries to take over Maraqua and fights with a beast called Chiazilla.
  • Into the Breach is a Turn-Based Tactics game in which you control a mech squad to repel the invasion of kaiju known as the Vek.
  • Robot Alchemic Drive has this as the entire plot with alien robots from space coming to earth on a semi-regular basis and the player having to fight them with remotely-piloted giant mecha.
  • In Fortnite, the Battle Royale Season 9 live event featured the giant Mecha Team Leader battling against a giant beast known as Cattus, or more officially, the Devourer. An epic battle ensued in real time, with the Mecha emerging victorious after stabbing the Devourer's head with a giant sword made from the statue of Singularity.

    Web Comics 

    Western Animation 
  • Futurama:
    • "Anthology of Interest I": A giant Bender is attacking the city, so Professor Farnsworth enlarges Zoidberg to fight it.
      Hermes: We're jerked! Nothing can stop a monster that big!
      Prof. Farnsworth: Nothing except an even more equally big monster!
    • "Benderama": Bender combines with his nanoreplicants to form one giant Bender to fight an alien giant.
  • One of Terry Gilliam's Monty Python animations was about an invasion of killer cars that were defeated by atomically-mutated giant cats. Unfortunately the cats then ate the city.
  • Sym-Bionic Titan: The eponymous mech versus the villain's Monster of the Week, although near the end of the first (and only) season, the American military did eventually build a mech of their own which managed to take down a Kaiju.


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