This article is about a member of House Heterodyne. For others in the lineage or other uses, see Heterodyne (disambiguation).
One of Agatha's forbears, we first hear about Pluto Heterodyne when the Mechanicsburg Watch Chief Drozeki interrogates the private Jägermonster detective, Ivo Sharktooth PJ .
Ivo goes on to explain that Pluto had decided that having a Town Watch was a good idea, but didn't want to have to look at them, so he created Secret Police so effective that normal humans couldn't see them nor remember them after 5 minutes. Constructs and monsters could (including Castle Heterodyne), but this apparently didn't save them from an ignoble end of going insane, vanishing and/or dying, leaving just Drozeki as the isolated head of a Watch now composed of (relatively) normal humans.
Adventures in Castle Heterodyne[]
Pluto Heterodyne was extremely paranoid, but also very good at coming up with "horrifyingly reasonable" things to be paranoid about. To avoid his anxieties, he focused all his attention on studying the cosmos. The invisible police force was created specifically to guard Mechanicsburg in his distracted absence.