History NightmareFuel / GirlGenius

* When Tarvek starts figuring out who (or ''what'') Higgs actually is, Higgs - who has been generally unflappable the whole time we've known him - laughs. And it's creepy as hell. Then again, [[spoiler:it's made less creepy once it's revealed Higgs is the jager spy master for the Heterodynes and firmly on Agatha's side]].

* The fate of Passholdt, and its inhabitants; everyone in the town was either transformed into a new and vicious form of revenant or was no doubt killed by their former neighbours. Even worse, it's implied that the revenants then went on to kill anyone who visited the town; Master Payne's circus is just the first one attacked that actually survived to get word to the Baron. And even worse than that, it's later revealed that the infestation was due to a Spark loyal to the Other, who was messing around with Slaver Engines.

* Princess Anevka Sturmvorous in her clank form is... quite unsettling with a PerpetualSmiler face and her clank form [[https://www.girlgeniusonline.com/comic.php?date=20191014 in this September 2019 strip]] is just full-on creepy. Of course, we never see what she looked like pre-clank, which is left to the audience to guess. Not that Anevka herself doesn't deserve some mention. Unlike a lot of the psychoes the comic has, she lacks any comedic traits whatsoever. Making it worse, we never really learn if this is because something went wrong with the mind-transfer, if there's just something about being a Clank, or if Anevka was just really like that.

* ''Literature/AgathaHAndTheSiegeOfMechanicsburg'' gives us a lot of time in the Baron's head, and it makes his situation all the more horrifying; he's aware of his enslavement and constantly battling to defy Lucrezia, a person who not only knows him intimately but takes great delight in making him do things he hates -- up to and including a forced mental overlay on his own son.

** Even worse? The Polar Lord responsible for the above horrors that Agatha defeats is all but stated to be ''a weakling'' compared to most of his kind, and he was ''still'' one of Agatha's deadliest foes to date that took quick thinking and a lot of sheer luck to defeat. No wonder Agatha's determined to learn as much as she can about these things.

* The fate of Passholdt, and its inhabitants.

** Worse yet, the freezing process doesn't seem to be fatal. Instead it mind controls the person and instantly turns them into a type of revenant even if they were immunized from the slaver wasps. Whatever powers they have, if they have brought their blizzards with them, they are more powerful than ''Lucrezia'' since even she can't just summon the ability to mind control someone on a whim.

** And now we've finally seen the Polar Lords in person. An ''army'' of frozen Revenants whose mere presence causes a biting blizzard to form in the immediate area, and they're led by some kind of lich-like, dragonic ''thing'' that freezes one of its soldiers to death for even entertaining the idea of parleying with the British-Wulfenbach coalition.

* [[https://www.girlgeniusonline.com/comic.php?date=20231025 We finally get a little exposition]] on [[UnseenEvil the Polar Ice Lords]], and it's ''not'' pretty. According to Neena, when the Great Ice retreated, Albia found the things that they hay left behind; [[NothingIsScarier whatever it was]], [[LetUsNeverSpeakOfThisAgain it was so horrible that she wouldn't talk about it]]. Because they stay up north and kill anyone who gets near, it's hard to learn anything at all about them, but following their attempted invasion two years ago, after Gil quarantined some of their people post-retreat, Neena snuck into one of their settlements in an attempt to speak with them: they variously described the Polar Lords as wizards, demons and monsters, capable of warping reality itself. Though Neena believed at the time that the people she spoke to were outright insane and difficult to understand, she was rattled enough that she still believes [[NotHyperbole they might have been telling the truth]].

* The prologue of ''Literature/AgathaHAndTheClockworkPrincess'' has Andronicus Valois as it's POV character during the war with the Heterodynes, and it sheds light on how terrifying {{Mad Scientist}}s like the Old Heterodynes must have been for "normal" non-Sparky people to go up against. Coalition armies had to pick up the dead bodies of their fallen comrades and take them elsewhere, because they "had learned the hard way that you didn’t allow The Heterodyne to collect your dead." (The implicaiton being that the Heterodyne would use the dead bodies to, for lack of a better term, ''[[HumanResources reuse]].'')

* After Zola stabs Agatha and makes her collapse, Tarvek ''[[UnstoppableRage snaps]]'' and [[https://www.girlgeniusonline.com/comic.php?date=20110117 beats Zola]] to a [[ExtremeMeleeRevenge bloody]] [[NoHoldsBarredBeatdown pulp]], ranting all the while about how his life has fallen apart after losing everything to the schemes of Lucrezia and his BigScrewedUpFamily, and that he ''absolutely'' won't let the same thing happen to [[MoralityChain Agatha]]. The previously [[TheUnfettered unhinged]] Zola is left weakly uttering her surrender, but Tarvek is too angry to care; he rejects her surrender and decides to settle for nothing less that killing Zola [[ChokeHolds with his own damn hands.]] To see Tarvek become so ferociously bloodthirsty is nothing short of unsettling.

* The Dreen. The first thing that both [[TheChessmaster Tarvek]] and a [[BloodKnight Jäger]] [[AuthorityEqualsAsskicking General]] do upon seeing one is panic and run for it.

* The BadFuture from Othar's Twitter adventures.

* The fate of Hraggel's Point, as described by two of Gil's agents who had [[http://www.girlgeniusonline.com/comic.php?date=20150615 horrifying front row seats:]]

* The Other / Lucrezia's relationship with Agatha is all kinds of hideously messed up to begin with, but it's strongly hinted that she / it intentionally conceived Agatha solely to use in the Summoning Engine. And Agatha was conceived after Bill and Barry went missing, raising a few very squicky questions as to just ''how'' she was conceived...
** The 4th novel says Lucrezia was pregnant with Agatha during the attack on the Castle.

* Princess Anevka Sturmvorous in her clank form is... quite unsettling with a PerpetualSmiler face and her clank form [[https://www.girlgeniusonline.com/comic.php?date=20191014 in this September 2019 strip]] is just full-on creepy. Of course, we never see what she looked like pre-clank, which is left to the audience to guess.
** Not that Anevka herself doesn't deserve some mention. Unlike a lot of the psychoes the comic has, she lacks any comedic traits whatsoever. Making it worse, we never really learn if this is because something went wrong with the mind-transfer, if there's just something about being a Clank, or if Anevka was just really like that.
* It's very easy to write off Othar Trygvassen (Gentleman Adventurer) as a humorously unkillable comic relief character, but every now and again he reminds us that his mission is to ''[[FinalSolution kill every spark in the world]].'' Upon his return in volume 8, after Tarvek shows a surprising (to Othar) amount of basic decency, he showers him with praise, then rather creepily reminds him that all the girls that fell victim to the Sturmvorous Summoning Engines were Sparks, and thus fated to die anyway, but Tarvek would be one of the last he'd go after.

* The Dreen. The first thing that both [[MagnificentBastard Tarvek]] and a [[BloodKnight Jäger]] [[AuthorityEqualsAsskicking General]] do upon seeing one is panic and run for it.

** The summoning engine was used on any girl found to have the Spark. Aaronev used it on ''hundreds'' of girls.
* The various tools Agatha's forebears left in the medical lab she and Gil try to cure Tarvek in are all designed for horrifying uses, except the scream generator which was just for ambiance without it actually having to injure someone to make the noise, including [[http://www.girlgeniusonline.com/comic.php?date=20090814 replacing blood with molten brass and eight different types of electrocution.]]

* The Dreen. The first thing that both [[MagnificentBastard Tarvek]] and a [[BloodKnight Jäger]] [[AuthorityEqualsAsskicking General]] do upon seeing one is panic and run for it.

* Princess Anevka Sturmvorous in her clank form is... [[UncannyValley quite unsettling]] with a PerpetualSmiler face and her clank form [[https://www.girlgeniusonline.com/comic.php?date=20191014 in this September 2019 strip]] is just full-on creepy. Of course, we never see what she looked like pre-clank, which is left to the audience to guess.

* When Tarvek starts figuring out who (or ''what'') Higgs actually is, Higgs - who has been generally unflappable the whole time we've known him - laughs. And it's creepy as hell.
** [[spoiler:It's made less creepy once it's revealed Higgs is the jager spy master for the Heterodynes and firmly on Agatha's side]].

* Prince Aaronev's experiment when he's first introduced. The novel manages to take it UpToEleven by mentioning ''twitching'', and a small, strangled scream...

* It's very easy to write off Othar Trygvassen (Gentleman Adventurer) as a humorously unkillable comic relief character, but every now and again he reminds us that his mission is to ''kill every spark in the world.'' Upon his return in volume 8, after Tarvek shows a surprising (to Othar) amount of basic decency, he showers him with praise, then rather creepily reminds him that all the girls that fell victim to the Sturmvorous Summoning Engines were Sparks, and thus fated to die anyway, but Tarvek would be one of the last he'd go after.

** [[spoiler:It's made less creepy once it's revealed Higgs in the jager spy master for the Heterodynes and firmly on Agatha's side]].

** It turns out even ''that'' is understating just how terrifying this entity is. It's not only large enough to hold several kaiju inside of it, it has strong enough sight to not only see a relatively tiny aircraft in the sky, but it can launch flying creatures from the ''pupils of its eyes''.

* Imagine you're Neena from [[https://www.girlgeniusonline.com/comic.php#.YtioH6QpA0E this page]]. Agatha has just caught you on the outside of a blimp several kilometers in the air after a spear has cut your lifeline, the mother of all kaiju, The Song Keeper, is bearing down on you with all of their monsters in tow, then, just to add a fart on the proverbial crap sandwich, Lucrezia, who had just been preoccupied with a fight and is absolutely gigantic, suddenly appears to grab Agatha (and you by extension), is it any wonder poor Neena freezes??