Everything About Fiction You Never Wanted to Know.
Here we see the Robeast in the wild competing with its only natural predator, the Super Robot.

The standard Monster of the Week for Super Robots and Super Sentai/Power Rangers.

A Robeast (a robot beast) is a Kaiju-sized monster, more often than not the same size as the Super Robot that battles it, though Robeasts in Sentai and 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 rarely capable of human-level intelligence or communication, and even when they are, usually prefer to just roar instead.

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. Not to be confused with Ambiguous Robots, though their design may sometimes imply they are this.

Examples of Robeast include:

Anime and Manga


  • The original form of Mechagodzilla. 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 confrontaion with (a second) Godzilla, playing with the trope.

Live Action TV

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

  • South Park—In the Sentai parody episode, Barbara Streisand turned into a Mechagodzilla.
    • And returned in "201" with full sentience.
  • Parodied in one episode of The Grim Adventures of Billy & Mandy where Grim takes Billy (who has been transformed into a 50-foot superhero) to Tokyo to meet a spoof of Gidora. An angry Mandy pilotes a giant gorilla robot called Mega-gorillasaur to bring them back.
  • The mecha-Stock Ness Monster in the Inspector Gadget episode "Monster Lake".