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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.



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    Anime and Manga 

    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.
    • 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.
  • Meka Dragon in King of Tokyo.



    Western Animation 
  • South Park — In the Kaiju parody episode, Barbra Streisand turned into a Mechagodzilla.
    • And returned in "201" with full sentience.
  • 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.
  • 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.
  • The mecha-Stock Ness Monster in the Inspector Gadget episode "Monster Lake".


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