History NightmareFuel / HellBoy

* The giant tentacled EldritchAbomination coming out of Rasputin's stomach.
* The Tooth Fairies. They sound cute, until you consider the fact that getting caught in a swarm of them means that you are EatenAlive.

* The destruction of the asylum Liz was in in the first film, by said pyrokinetic's nightmare-guided hand. It exploded while guards and patients were all on site.
** Her childhood victims' fates are also pretty scary, though they're AssholeVictims and deserve what they're getting.

** Although Hellboy breaks the ritual seemingly making the Ogdru Jahad disintegrate in thin air, the sequel heavily implies that they're actually very much still alive and dangerous given how the Angel of Death warns Liz that Red will still go on to lead the apocalypse if she accepts to make him live, a terrifying but intriguing SequelHook that sadly never got payoff in a third movie that never was.

* While it's easy to hate on the citizens turning into an AngryMob towards Hellboy and his group, try to see it from their point of view: Hellboy used to be more of an urban legend, a cyptic, who while showing some traces of his existence, was still a mysterious figure who'd come and go, and whenever it came across someone (like the child at the rooftop and the people he saves at the subway fight with Sammael) they react with enthusiasm because they're having a special, personal encounter with the mysterious figure everyone buzzes about, or would eventually rationalize it's some kind of strange stunt and not find him exceptional. The fight with the Elemental was a shock because the entire population learned that Hellboy, the supernatural and dangerous, malignant fantasy creatures are all 100% real, and the personal awe easily turned into all sorts of FridgeHorror fears about the implications of this reveal, about what else could be out there (indeed; an insane elf prince wants to unleash an unkillable robot army to exterminate mankind).
* The Angel of Death is quite scary, an AngelicAbomination with an EyelessFace and [[EyesDoNotBelongThere eyes all over its wings]], who keeps [[EvilLaugh cackling]] in a very creepy way while informing Liz of its universal omniscience. It's not shown to have BlueAndOrangeMorality since it initially reacts with annoyance at the Goblin Master Blacksmith coming in, so despite being a neutral figure who claims that its heart is filled with dust and sand, the Angel clearly ''revels'' at the concept of impending doom Hellboy's survival will supposedly bring and all the deaths he'll cause. Overall, this monstrous thing is out there, it knows everything, and it'll have a big laugh when it'll collect our souls once the end of times comes.

* In "The Sleeping and the Dead," we learn that the vast majority of Europe's vampires have decided to go underground, sleeping and waiting for a time when humans forget they ever existed, with others creating new vampires that immediately join the others. When humans finally forget about vampires, and how to fight them, they will reemerge and rule the Earth. This is illustrated with a scene of a ruined city with the air ''filled'' with bats.

** Although Hellboy breaks the ritual seemingly making the Ogdru Jahad disintegrate in thin air, the sequel heavily implies that they're actually very much still alive and dangerous given how the Angel of Death warns Liz that Red will still go on to lead the apocalypse if she accepts to make him live, a terrifying but intriguing SequelHook that sadly never got expanded upon in a third movie that never was.

** Although Hellboy breaks the ritual seemingly making the Ogru Jahad disintegrate in thin air, the sequel heavily implies that they're actually very much still alive and dangerous given how the Angel of Death warns Liz that Red will still go on to lead the apocalypse if she accepts to make him live, a terrifying but intriguing SequelHook that sadly never got expanded upon in a third movie that never was.

* The vision Rasputin shows Professor Broom of what the future will be if his plans succeed: a CosmicHorror [[ApocalypseHow/ClassZ Class Z Apocalypse]] with smoking SceneryGorn, and [[DramaticThunder thundering]], flaming [[RedSkyTakeWarning red skies]] from which giant tentacles belonging to [[EldritchAbomination Eldritch Abominations]] hidden in the clouds dominate the scorched Earth Rasputin and his masters consider a "New Eden".

* The vision Rasputin shows Professor Broom of what the future will be if his plans succeed.

* [[HumanoidAbomination Kroenen]], especially when he's shown without his gas mask and almost completely naked. He's covered with [[CoveredInScars huge, grotesque scars]] from his surgical addiction. His eyelids and upper and lower lips have been completely removed making him look like something that crawled out of the UncannyValley. And it was all self-inflicted. Not to mention his inhuman movements, cybernetic implants, and body so decayed he literally excretes sand instead of blood when damaged.

* In "The Sleeping and the Dead," we learn that the vast majority of Europe's vampires have decided to go underground, sleeping and waiting for a time when humans forget they ever existed, with others creating new vampires that immediately join the others. When that happens, they will reemerge and rule the Earth. This is illustrated with a scene of a ruined city with the air ''filled'' with bats.

* Kroenen when he's shown without his gasmask and almost completely naked. He's covered with [[CoveredInScars huge, grotesque scars]] from his surgical addiction. His eyelids and upper and lower lips have been completely removed making him look like something that crawled out of the UncannyValley. And it was all self-inflicted.

* Hectate's long ascension to become patron Goddess of Witches. To date, her forms include a woman with a snake's lower body, an iron-maiden with glowing blue eyes,a strange robotic hybrid of the first two forms and a desiccated corpse barely clinging on to consciousness (when last we saw her, in her conversation with Grey). She is also the ultimate source of vampirism in the Hellboy-verse

** Except [[NightmareRetardant it's a Wilhelm scream]]

* The giant tentacled EldritchAbomination [[spoiler: coming out of Rasputin's stomach.]]

* The destruction of the asylum [[spoiler: Liz was in in the first film, by said pyrokinetic's nightmare-guided hand]]. It exploded while guards and patients were all on site.
** [[spoiler: Her]] childhood victims' fates are also pretty scary, though they're AssholeVictims and deserve what they're getting.

* Hectate's long ascension to become patron Goddess of Witches. To date, her forms include a woman with a snake's lower body, an iron-maiden with glowing blue eyes,a strange robotic hybrid of the first two forms and a dessicated corpse barely clinging on to consciousness (when last we saw her, in her conversation with Grey). She is also the ultimate source of vampirism in the Hellboy-verse

* Rasputin's unnerving ability to turn up ''anywhere'' - the museum where Hellboy first fights Sammael, Liz'z room in the mental hospital, even the freaking BPRD.

* NightmareFuel: Hectate's long ascension to become patron Goddess of Witches. To date, her forms include a woman with a snake's lower body, an iron-maiden with glowing blue eyes,a strange robotic hybrid of the first two forms and a dessicated corpse barely clinging on to consciousness (when last we saw her, in her conversation with Grey). She is also the ultimate source of vampirism in the Hellboy-verse

* Rasputin getting dragged into the portal. Some of his skin and flesh comes off in little globules, and it looks like his eyes float out of his head. He also is folded in half before entering the portal, getting his pelvis sucked in before the rest of him. Even though he's a Nazi creep, you end up feeling squicked out.

* Rasputin getting dragged into the portal. Some of his skin and flesh comes off in little globules, and it looks like his eyes "float out of his head". He also is "folded in half" before entering the portal, getting his pelvis sucked in before the rest of him. Even though he's a Nazi creep, you end up feeling squicked out.
* The destruction of the asylum [[spoiler: Liz was in in the first film, by said pyrokinetic's nightmare-guided hand]]. It exploded while "guards and patients" were all on site.

* The destruction of the asylum [[Liz was in in the first film, by said pyrokinetic's nightmare-guided hand]]. It exploded while "guards and patients" were all on site.
** [[Her]] childhood victims' fates are also pretty scary, though they're AssholeVictims and deserve what they're getting.

* The Nazi scientist getting sucked into the vortex. His skin gets burned/melted away as he screams.

* Kroenen when he's shown without his gasmask and almost completely naked. He's covered with grotesque scars from his surgical addiction and his eyelids and upper and lower lips have been completely removed. He looks every bit the monster he is on the inside. And it was all self-inflicted.

* The Conqueror Worm is a gigantic caterpillar-like EldritchAbomination that does nothing except eat, and grow, and eat, and grow some more. If Hellboy and Abe hadn't stopped it, it would have continued doing this until [[ApocalypseHow it has eaten everything on the planet]].