Girl Genius
Girl Genius

MRR... MRR... RRR?

The Fun-Sized Mobile Agony and Death Dispensers (or, on this wiki at least, "Fun-MADD" for short) are powerful animal-shaped clanks inside Castle Heterodyne. They were created by an unknown-at-this-writing Heterodyne as "independent guardian systems" not unlike the Torchmen, to patrol the Castle interior, providing rapid remote access anywhere inside the complex, and efficient dispatch of unwanted visitors.

When Agatha arrives in the Castle, they are called Devil Dogs[1] by the other residents even though they have a feline appearance. (Even the Foglios call them "tiger-like".) The novelization rewrites this scene to have Moloch call them Steam Cats.[2] They are very likely given other labels by the prisoners, but this is, after all, a family-friendly semi-fictional historical romance and such names are not appropriately printed here.

Among the features one might expect from a generally feline physiognomy, the Fun-MADD has a tail — though scorpion-like — which provides defense for its own dorsal area and self-luminous eyes and mouth — which could possibly be providing infrared illumination as well as systems heat exhaust.

Normally these clanks are controlled universally by the Castle, but when Agatha encounters her first example of one, they are operating independently due to the building's widespread damage and system disconnections. In this state they are not very smart , able to hunt only by detecting motion, and are easily distracted , but are still physically powerful. Why they are still active after twenty or so years with no maintenance is not explained; despite being the size of a wagon, they have no obvious source of power. Perhaps they draw power from Castle systems.

Agatha deals with that first example by luring it into an area where a compliant Castle-fragment can crush it, but when she later encounters a whole swarm (pack?[3] clowder?[4] ambush?[5]) of them, instead of just using the handy Heterodyne Harvester to do the job herself, she creates a temporary bridge to bypass them. At another point she has some Dingbots hotwire a damaged one and uses it to settle Zola's hash, at least temporarily.

When the ascendant Lady Heterodyne and her various friends and minions finally succeed in fully restoring The Castle's power, it is able to reassert control of the Fun-MADDs. Additionally, after some of Team Agatha transfer the consciousness of Muse of Protection Otilia into an upgraded Fun-MADD, she also can control the other Fun-MADDs to a point . This is fortunate, as the aforementioned bridge plan gets disrupted by unforeseen events, and Otilia arrives just in time to save Gil and Tarvek from being Devil Dog chow.

The Future (and The Past)[]

In a side-story set after the events of the Other War, it is revealed that a Fun-MADD is included among the defenses of the dragon-hoard of the late Hydrargyos the Godburner; it is speculated by Franz that an old-school Heterodyne "pity-gifted" it to Hydragyos's unnamed creator. It's eventually destroyed by Franz using the Iram Solis.

The Fun-MADDs have become the most popular kid's ride on Castle Day .


  1. The first appearance of "devil dog" is when Sanaa mentions "fetching devil dog chow" as a fool's errand on the way to the kitchen. This happens in both the comic (2008-02-18 (Monday) ) and Agatha H. and the Voice of the Castle p. 156.
  2. Voice of the Castle p. 237. Unfortunately, this obscures the meaning of "devil dog chow".
  3. if dogs
  4. if cats
  5. if tigers