!For the comic books:
* The Smurfs had their share of creepy adventures. Like ''The Black Smurfs'', where the Smurfs were being turned into evil black versions of themselves that could say nothing but "G'nap!", and bit each other on the tail to spread the infection.
** Worse was the ending of ''The Black Smurfs''. Papa Smurf had been bitten. The only reason anyone was cured was cartoon physics, with the fire spreading the antidote as a gas rather than diluting and burning it on the ground. Otherwise they'd all still be that way.
** The worst thing about the Black/Purple Smurfs is unlike the zombies they're loosely based on, [[ItCanThink they aren't mindless]]. One of the transformed Smurfs intentionally paints itself blue to make itself look like it's been cured, allowing it to spread the infection in safety. Trying to stop TheVirus is bad enough, but having said virus be smart enough that it can counter your lines of defense is so much more chilling.
** Oh that is just the tip of the iceberg. The Black/Purple Smurf plague has happened before. Papa Smurf had a book chronicling the disease in exquisite detail, down to a rather vivid color illustration of the source, the "Buzz fly." In fact, the only detail missing was the cure which Papa Smurf discovered completely by accident. There are several chilling implications to this. 1.) The person who wrote that book, witnessing the event first hand, may have had to abandon village with a small group of Smurf survivors, leaving the book as a cautionary tale. Which could mean there's an entire population of "G'naps" out there somewhere. 2.) There are ''other'' Buzz flies in existence, which means TheVirus can strike again at any time, especially as there's no acquired immunity. (Near the end of the episode, cured Smurfs would be reinfected even as their neighbors were curing others.) 3.) TheVirus ''learns'' from its mistakes and mishaps, which means that even if 1.) did not occur because the Smurfs were cured without understanding why (ie, a large batch of that flower pollen just happened to blow through the village for no discernible reason), should the Buzz Fly strike again, the new G'naps may just start seeking out and destroying this flower before moving in on Smurf village. To wit, while Papa Smurf and the Smurfs got more and more desperate, trying all sorts of random things just to see what works, the G'naps were watching, waiting, and planning. They only attacked en masse when word got out that a cure exists, and the G'nap that painted itself blue? In the animated version it was Hefty Smurf, who could wrestle a G'nap to standstill before he got bitten and turned. How tough are the G'naps? It took three Smurfs to subdue Clumsy Smurf while he was tangled in his own net (it was way easier to carry the Smurf from the original version of that scene). Which means that even if Smurfs were able to get close enough to figure out he was just faking being cured, he could ''easily'' subdue and turn them.
* In regards to the Purple Smurfs mentioned below, according to [[http://www.toplessrobot.com/2008/01/the_10_most_disturbing_smurfs.php this site]], in the original Belgian comic, the Smurfs turned '''black'''. [[UnfortunateImplications No, really. Try wrapping your mind around all of that]].

!For ''The Smurfs and the Magic Flute'':
* Go [[NightmareFuel/TheSmurfsAndTheMagicFlute here]].

!For the Hanna Barbera cartoon:
* In the episode ''Smurf Colored Glasses'' Big Mouth put the glasses on and saw Gargamel and Azrael as food, and it is rscary because it gives the audience an idea that Big Mouth is actually going to eat Gargamel and Azreal. (Even worse, he threatened to do that previously, ''without'' the glasses.)
* ''TheSmurfs'' had their share of creepy adventures. Like the episode where the Smurfs were being turned into evil purple versions of themselves that could say nothing but "G'nap!", and bit each other on the tail to spread [[TheVirus the infection]]. The ending to the 'G'nap!' episode looked bleak as even Papa Smurf had been bitten. The only reason anyone was cured was cartoon physics, with the fire spreading the antidote as a gas rather than diluting and burning it on the ground. Otherwise they'd all still be that way.
* "The Smurfs Christmas Special": At least two examples:
** The climatic scene where Papa Smurf leads a rescue mission for two children, Gargamel and Azrael from an evil wizard, who conjures a wall of fire around himself, the kids, and the IneffectualSympatheticVillain, only to fade away screaming in defeated despair under the Smurfs' repeated singing of a sappy holiday song. The evil stranger, using his powers to make the fire grow and frighten the children adds to the scary situation.
** But none of that holds a candle to what The Stranger -- his unofficial fan name -- has in store for the children. Having kidnapped them in revenge for their uncle (a justice of the peace in their kingdom) always having thwarted his treacherous plans, he plans to take them away on "The Final Journey" through a {{Hellgate}}. When the children begin to cry and beg to go home, The Stranger accelerates his plans and insists that the children will like their new home. It is never explicitly stated what exactly he had in mind, but it is often implied by fans that he planned to do [[AFateWorseThanDeath something incredibly and horrifically evil]] to the children that defied description and would make [[RapeIsASpecialKindOfEvil rape seem like nothing]]. Even Gargamel and Azrael -- whom are irredeemably evil themselves -- are genuinely horrified to the point where they object ... only for The Stranger to force them to come along! The Stranger's plans are thwarted in the end, but the very thought of the fate the children were facing is downright frightening and bone-chilling, even for an adult cartoon but especially for a program aimed at pre-teens.
* There's also the episode "All Work and No Smurf", in which overworked Smurfs begin to transform into various inanimate objects. Talk about AndIMustScream. They still had mouths and spoke, which makes it ''worse''.
* The episode "To Coin A Smurf" has Gargamel ''actually succeed'' at turning three Smurfs (Brainy, Grandpa and Sassette) into gold coins. He was happily singing about it as he was headed into town considering how to spend them. Had it not been for him being mugged by a couple of robbers and the three of them being arrested, those three coins could have wound up lost in circulation or a vault somewhere, forever. To highlight how terrifying this is, [[AndIMustScream the coins were fully conscious with the inability to act]]; they could all still see, hear, talk, and ''feel pain'' as several characters '''bit the coins''' to test if they were actually gold (which prompted them to go "Ouch" each time).
* The episode where Brainy Smurf gets turned into a monstrous Werewolf-Smurf creature from a scratch from a magical plant.
* Whatever you do, don't say "Kaplowey"! It'll make whatever you're pointing at vanish. People included. (At the end, using the word on the magic scroll that empowers it reverses the effect and things begin reappearing...[[FridgeLogic but a) who knows what dangerous things it might have been used on? and b) sooner or later the scroll will reappear too]]!
* First episode of season four, "Scary smurfs". Monster children abduct few smurfs as part of school project and turn them in monsters. It all turns out well at the end, but it is still very disturbing.
* Gargamel's goals were, originally, to either eat the smurfs in order to gain immortality, or use an alchemical formula to turn them all into gold. So, on one hand, he's trying to devour a sapient race for his own selfish goals, and on the other, he's trying to commit wholesale genocide to line his own pockets.
** Speaking of eating Smurfs, on several occassions he also threatens and even attempts to eat a Smurf ''alive'', including but not limited to Clumsy, Vanity, Wild, and ''[[WouldHurtAChild Baby Smurf]]''. And without the [[TheGoodGuysAlwaysWin "good always triumphs"]] standard that keeps him from doing so, he would have a chance at achieving such. Try letting that one sink in for a while.
*** In "Vanity's Wild Adventure", Gargamel tries to do this twice, Vanity the first and Wild the second time. The first time he tries, he grabs Vanity by his leg and goes straight for eating him on the spot (prompting Scruple to go "[[EvenEvilHasStandards Show some class, Gargy!]]"), and the second time he tries, he says: "When I'm done with this tender tidbit, there won't even be crumbs!" He basically just implied ''[[JustEatHim he wasn't going to chew]]''.
*** "A Gift For Papa's Day" provides a rather chilling case where Gargamel threatens to eat several Smurfs ''[[ForcedToWatch right in front of Papa Smurf]]''. And when doing that he doesn't just say he'll eat them, he explicitly says "I'll eat them before your very eyes". Not only does that go to show just how cruel and terrifying he can actually be, it also provides very disturbing implications dealing with [[TheBadGuyWins Gargamel actually carrying out his threat]]; just try to imagine the scenario where Papa Smurf watches one of his most common enemies [[AdultFear down several of his own children right in front of him]], on his birthday, [[DisasterDominoes all because of a (rather hideous) hat his little Smurfs wanted to give to him as a gift]]... which he's been trying to get rid of and as a result ended up in Gargamel's hands (like the Smurfs that searched for it), quite possibly leading to Papa Smurf [[MyGodWhatHaveIDone blaming himself for the whole tragedy as well]] and never being able to forgive himself for it.
* The episode "Sir Hefty", involving a huge, {{Franchise/Godzilla}}-esque, [[OurDragonsAreDifferent green wingless dragon]] terrorizing the Smurf forest and burning everything it came across with its fire-breath. The sheer destruction the monster causes in its wake is truly chilling, as is the fact the dragon is portrayed as one of the show's [[KnightOfCerebus most threatening]] and [[VileVillainSaccharineShow genuinely dangerous]] antagonists.
* Imagine this from Laconia's perspective in the episode "Smurfily Ever After": you're a [[CuteMute mute (and apparently deaf) woodelf girl]] who's about to get married to a very nice woodelf friend, and everyone in the forest (except for Mother Nature, who sent a calliope as a gift instead telling she couldn't come) is going to attend. All is well and dandy, and the wedding is going perfect. [[MoodWhiplash Then all of a sudden]], the calliope starts playing terrifying music and ghosts start flying out of it, [[SugarApocalypse the scenery quickly shifts from sunny to outright dark]], and everyone around you turns into mindless zombies that start walking towards the huge cauldron of boiling water located in the calliope with you unable to snap them out of their trance.
* Nemesis, big time. What makes him terrifying is the fact that one of the features that define him is FacialHorror; following a curse being placed on him, Nemesis' face became so disfigured and grotesque that it horrifies other characters no matter how brave they are (only one of them being an exception). [[NothingIsScarier We never get to see the face itself]], but what we do get to see instead is [[https://vignette2.wikia.nocookie.net/smurfs/images/b/b9/Nemesis_Face_Deformed.png the back of his head]] - boils on top of said head and large gremlin-like ears that look like they're melting, complete with prominent veins - which only makes the implication of it being a genuinely shocking sight worse. Simply put, an otherwise lighthearted show has just provided a character whose face may well be NSFL[[note]]"Not Safe For Life" - A label for media or events with the potential to traumatize others through having its content viewed[[/note]], certainly in-universe and potentially out of it as well.
* Gargamel's VillainSong from "The Blue Plague", while otherwise a variation of "Mean, Sour, Nasty and Cruel", features lyrics about him concocting a malicious poison for Brainy to take and administer to the Smurfs - explaining how he's basically going to torture them with a horrible sickness, also adding that he'll "do them in" and "cure them of everything, even breathing" (which both allude to his intent to actually ''kill'' them), together with his visions of terribly sick Smurfs and him suddenly appearing in their village and grabbing them as they panic and try to get away. But the highlight has to be the very brief scenes of a close up on Gargamel's face; [[UncannyValley the way his face is drawn]] is somewhat unsettling and the one placed at the end of the song [[EatTheCamera zooms into his mouth]] [[JumpScare right out of nowhere]] - the latter which becomes all the more disturbing once you realize one of Gargamel's goals is to eat the Smurfs. Oh, and during said scene, he seems to be ''[[TheFourthWallWillNotProtectYou looking at the viewer while at it]]''.
* Really, just the base premise of the show that dominates the first season or two is subject to FridgeHorror. Namely, it revolves around a village of little people that are in a constant, unending conflict with someone much bigger than them who holds an improbably big grudge against them, to the point of patrolling the area day in and day out in hopes of capturing them and doing who knows what to them - and as a result they greatly fear him and do everything to keep their village safe too. Think of it like this: you live in your home and in your vicinity there's someone who hates you to death, and as soon as you step outside the safety of your home, [[ParanoiaFuel you're exposing yourself to someone wanting to personally murder you]]. This is something the Smurfs have to live with every single day of their lives.

!For the 2011 movie:
* Seeing Papa Smurf suffer while Gargamel is zapping him is a little unsettling. Smurfette calling [[SayMyName his name]] doesn't help. Also, the scene where Gargamel starts capturing the Smurfs during the climax.
* Clumsy learns why he is called thus; shades of Forrest Gump realizing he's just not as smart as most other men.

!For ''Smurfs 2'':
* Go [[NightmareFuel/TheSmurfs2 here]].