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Portmanteau of "robot" and "beast". The standard Monster of the Week for Super Robots and Super Sentai/Power Rangers.

A Robeast is a Kaiju-sized monster, more often than not the same size as the Super Robot that battles it, though Robeasts in Toku may also start in human size, so as to be a threat on a personal scale, then grows through some form of Applied Phlebotinum.

Robeasts are sometimes capable of human-level intelligence or communication, though when they are, they usually spout interchangeable villainous threats and taunts.


Robeasts are usually built with both biological and mechanical construction (though some are also completely mechanical, magical constructs, giant demons, and the like). They come in a dizzying variety of shapes, abilities, and weapons, and very rarely will any two robeasts look alike, even between robeasts deployed by the same villain(s). Many of them avoid humanoid designs and mook status, becoming a Mechanical Monster.

They are almost always Made of Explodium. Compare Animal Mecha. Not to be confused with Ambiguous Robots, though their design may sometimes imply they are this. Smaller versions of these may be covered under Mechanical Animals.



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    Anime and Manga 
  • The Automatons in Aposimz are mechanical monsters that vary in size from small worms to Kaiju. Since they are covered with Placenta, some also count as food.
  • Mostly inverted with some Android/Cyborg Digimon. They're mainly made up of network data and are highly-intelligent, but some still counts.
  • The True Companions of Gaiking and Gaiking: Legend of Daiku Maryu fly around inside a gigantic mechanical dragon called Daiku Maryu.
  • The Ganbare Goemon anime had Seppukumaru, the bad guy from the third Goemon game, summon creatures called "Cyber Devils" to fight the eponymous Mystical Ninja and his allies. Despite resembling organic monsters, they were actually mecha piloted by either Sepukkumaru himself and/or his egg shaped underlings.
  • GEAR Fighter Dendoh has the entire Galfer species, with a specific hierarchy. From bottom to top, we have: Galfer Soldiers, Galfer Guards (supposedly stronger versions of the Soldiers), Mechanical Beasts (Soldiers that have increased their power by fusing with some technological object), Heavy Machines, Professional Machines (specialized Galfer with power between Mechanical Beasts and Heavy Machines, and much faster, smarter and trickier than the latter. They're usually part of Quirky Miniboss Squads), Lagowe, Zero (similar to a Professional Machine but even more powerful than a Heavy Machine, and actually part of the Galfer Emperor), and the Galfer Emperor himself.
  • The minions of the Shadow Angels, usually cherubim, in Genesis of Aquarion.
  • The Beastmen Ganmen / Gunmen and the Anti-Spiral Mugann from Tengen Toppa Gurren Lagann.
    • Gunmen are also an inversion, because the heroes use the exact same kinds of robots they stole from the beastmen.
    • Slightly inverted in that the Mechasauruses, like much of the Reptilians, are a highly intelligent race.
  • Voltron is the Trope Namer, after the monsters in GoLion and Dairugger XV. The equivalent terms were Deathblack Beastmen (then Mechablack Beastmen) in GoLion and Combat Machines in Dairugger XV.

    Fan Works 
  • Advice and Trust: The cast fights Angels, giant alien monsters with Eldritch Abomination traits, but due to the changes in the relationships between the three pilots, the battles are very different from canon.
  • The Child of Love:
    • In chapter 3 shows up an Angel made up by the writer. It is based on Sahaquiel: it is an enormous, floating, heavy thing that plummets downward and tries to crush Tokyo-3 under its weight.
    • In chapter 7 appears another originally created Angel. It is called “Megrael”, it looks like a winged Evangelion and it remained airborne while shooting light beams.
  • Children of an Elder God: At the beginning the Angels fought by the main characters seem to be just weird, massive aliens monsters, although very ancient and slightly eldritch. Then it is revealed that they are full-blown Eldritch Abominations and there are worst things behind them and their attacks.
  • Doing It Right This Time: The Angels -giant alien monsters- of canon, fought in the original timeline. Now the main characters have returned to the past, the battles have become quite different.
  • HERZ: In a chapter the cast had to fight an illegal Eva built secretly by the Chinese Government. It looked like the mutated offspring of a Mechanical Beast and an Evangelion.
  • Higher Learning: The cast fights the giant aliens called Angels per canon. Unlike canon, though, Bardiel got killed before having the chance to seize Unit-03, and the pilots never met it.
  • Last Child of Krypton: Shinji -as Superman- and his pilot friends — driving giant robots — fight the Angels, alien Eldritch Abominations. In this crossover they had ruined other worlds before assaulting Earth: they wrecked Mars in the original fic, and Krypton in the second version.
  • Neon Genesis Evangelion: Genocide features several brand-new Angels, who — as it turns out — are all the artificial creations of the mad A.I. known as the Emerald Tablet: the first is a possessed experimental Mass Produced Evangelion, formely Unit-A, but rebranded as Samael upon being declared an Angel, the second is a massive blob of inky darkness that possesses Unit-08, and the third one is a clone of Kaworu, directly controlled by the the Emerald Tablet itself.
  • In Once More with Feeling, the canonical Angels seem to be stronger than their canon selves after the timeline got rebooted.
  • The One I Love Is...: The Angels — or Messengers — giant alien monsters sporting all kind of shapes and abilities. Nearly all of them keep their canon selves, but Tabris. He is a her in this story.
  • Scar Tissue: The giant alien Angels had been all killed before the beginning of the story, but a Russian black project had used samples of their DNA to create another massive monster. In order to destroy it, the main characters have to repair and reactivate their last giant robot left.
  • Superwomen of Eva 2: Lone Heir of Krypton: The Angels from canon -humongous Eldritch Abominations-. Unlike than in canon, though, Asuka can fight them without her Humongous Mecha thanks to her Kryptonian DNA.
  • Thousand Shinji alters the Angels' origins and natures so they fit in with the Warhammer 40,000 side of the crossover.

  • The original form of Mechagodzilla from Godzilla franchise. The second version was a human piloted mecha. The third version was a human piloted mecha built on the bones of the original Godzilla, dubbed Kiryu. Kiryu went berserk in its first confrontation with (a second) Godzilla, playing with the trope.
    • Then there's the cyborg Kaiju Gigan, the original Moguera (the second M.O.G.U.E.R.A. was, again, a human-built mecha), and Mecha-King Ghidorah.
  • From the Toho-produced King Kong Escapes comes Mechani-Kong, who beats Mechagodzilla by some 7 years, but comes a full decade after Moguera.

    Live-Action TV 
  • Toku such as Super Sentai (and by extension Power Rangers) revolve around this, with a different rubber suit Monster of the Week to challenge the heroes (and oftentimes the heroes' giant robots) as the driving force behind the villain's scheme. Every Big Bad has his or her own way of making monsters, and making them bigger. They're sometimes the source of Nightmare Fuel, and sometimes Narm Charm. Sentience and whether or not they're Always Chaotic Evil varies from series to series.
    • One Sentai show, Choudenshi Bioman, only applied this to the giant battles (and thus averted Make My Monster Grow) — the Biomen instead fought a group of recurring monsters on the ground exclusively, then fought a Mecha Gigant (or later, a Neo-Mecha Gigant, sometimes piloted by one of the three generals). This approach didn't really see much (if any) use afterwards, likely for budgetary reasons (since the monster of the week was only used in the giant battles as opposed to both giant and ground battles, meaning Toei wasn't getting as much use for their money).
    • Partial example with the Ultra Series, as most of the kaiju are more in the vein of Godzilla than Super Sentai, while the Ultras are aliens instead of robots. Nevertheless, they inspired a great deal of the examples here, and a number of the monsters fought by the heroes fit the trope in some way or another. They're not all one-off Monsters of the Week either, with many becoming as every bit as popular and iconic as Ultraman himself.

    Tabletop Games 
  • Pretty much everything in Monsterpocalypse. For extra fun, the same company has released completely-compatible Voltron units, so the game has actual Robeasts.


    Video Games 

    Western Animation 
  • The Rabbot and the Insanoflex from Aqua Teen Hunger Force.
  • Parodied in one episode of The Grim Adventures of Billy & Mandy where Grim takes Billy (who has been transformed into a 100-foot-tall superhero) to Tokyo to meet a spoof of Gamera and Ghidorah. An angry Mandy pilots a giant gorilla robot called Mega-Gorillasaur to bring them back.
  • The mecha-Stock Ness Monster in the Inspector Gadget episode "Monster Lake".
  • South Park — In the Kaiju parody episode, Barbra Streisand turned into a Mechagodzilla.
    • And returned in "201" with full sentience.
  • As Voltron: Legendary Defender is a reboot of the Trope Namer; of course they show up. But in this case, they are much nastier threats than the ones the Paladins usually face and often entire episodes are dedicated to taking them down. They're not even named until Season 2, when Hunk panics at facing another "robot... beast! Ro-beast!" Unfortunately, there are also significantly downplayed — they stop appearing altogether shortly after the second season, leaving a paltry four Robeasts in the entire 78-episode run.