Dr. Prometheus Bunbury is a minor(?) Spark mentioned by Gil in his [ mock "duel"] [[Chronology - Volume #|✣ ]] with Zeetha. He appears to specialize in novelty items for parties, etc. Gil tries to use one of Bunbury's "Jolly Fun Oxidation Enhancers" to eliminate the "base metals" that Zeetha is carrying (i.e., her swords), but goofs and uses a "Wacky Weave Destabilizer" instead. The result is that Zeetha's characteristic blue outfit is, well, destabilized. Fortunately, she's [ prepared] [[Chronology - Volume #|✣ ]] for this, after a fashion, with unknown significance for the plot, but also with the real-world result that Girl Genius continues to be rated PG-13 rather than R.