- In episode 10, the Digimon Emperor manages to take control of Agumon using a Dark Spiral, which is much more powerful than the Dark Rings.Digimon Emperor: So, you've come back to me, Agumon. And I've got a new friendship bracelet for you! [Throws the Dark Spiral onto Agumon's arm]
Agumon: What happened? [Grunts in pain as the Dark Spiral takes effect]
Digimon Emperor: You are mine again!
[Agumon's eyes turn red and he growls]
- And then the Digimon Emperor makes him digivolve into MetalGreymon (Virus), who looks absolutely terrifying.
- Compounding this form's horror value even further, MetalGreymon (Virus) (which, keep in mind, is the original design for MetalGreymon) is what happens when a Greymon tries to cheat death and extend its vital functions through remodeling. However, their flesh is unable to hold out, turning a sickly blue and making the Digimon look more like a zombie. Considering that Agumon was able to reach the perfected MetalGreymon form, and is now forced into the Mechanical Monster that is this version, imagine how much pain Agumon is going through due to the possible draining of his vital functions, even as he's being controlled by a Dark Spiral. Compared to that, SkullGreymon sounds like a walk through a field of daisies, doesn't it?
- The Dark Ocean, and the creatures living in it.
- The Scubamon, or rather the unidentified things that were pretending to be Scubamon, in episode 13 who live near the Dark Ocean want Kari to have a child with them. One of them even calls Kari a "virgin". And no, they don't seem to care much for her consent. It's only slightly better in the dub where they want to brainwash her into being their "Queen" so she can lead them to greater evil heights.
- It's also implied that they want her to bear their children so they'll have the power to take on the master of the Dark Ocean, a twisted and powerful creature called Dragomon who never physically appears in the series and is the Digimon equivalent of Cthulu.
- During episode 20, Ken starts hearing voices that laugh at him. He even has a vision of himself about to fall into a deep dark hole. Instead of taking a moment to stop and consider what's going on, Ken instead grows more and more maniacal.
- It's also implied during to his jaunt into the Dark Whirlpool to gather Devimon's loose data that something followed him back.
- The apparition of Devimon.
- His appearance in the Dark Whirlpool is a fragment of his former self who the Digimon Emperor hunts down to gather his data to create Kimeramon. The implication of Devimon being here is that either he's been reviving all this time, or that he's spent three whole years alive and reforming after Angemon beat him. And then when his data is used to complete Kimeramon his personality turns out to have survived and his evil influence turns Kimeramon into an unstoppable rampaging berserker that takes Magnamon, a Royal Knight with power on par with a Mega Level digimon, to finally be put down. Even three years later, the original Big Bad of Digimon is still terrifying.
- The only other implication is no better: the Dark Whirlpool could be a link between the Digital World and the Dark Ocean, where extremely evil Digimon are implied to be sent when they die. The voice is implied to either be Devimon's spirit taunting him or something else entirely. When the hole opens he sees something the viewer can't and screams in horror until it closes, at which point he goes Laughing Mad. Either he saw the spirit of an evil Digimon like Devimon or Apocalymon in there... ...or he saw the otherwise absent Dragomon and like a character in the Cthulu Mythos went mad from the sight of him.
- The Digimon Emperor's Villainous Breakdown after realizing the Digital World wasn't a game.
- Oikawa's creepy email to young Ken in "Genesis of Evil"."I'm sorry for the loss of your brother. It must have been hard to take, but don't worry. Your brother is in a better place than this world. He is finally at rest. But when his soul became free, yours became trapped. You will now bare the burden of both his destiny and your own. Now that your parents have lost their hopes for their "perfect child". You will be expected to carry out the dreams that Sam can no longer fulfill. This world will become unbearable for you, the pressure to succeed will be too great. But let me tell you about another world that is much more appropriate... a world where your soul can finally be free, where you answer to no one but yourself."
- From the same episode, young Ken's first trip to the Dark Ocean. He finds himself standing at the edge of the water. Then the audience is treated to bits of dialogue of Ken as the Digimon Emperor as Ken gives in to his anger and places his Digivice in the water, letting the Dark Ocean corrupt it.
- His first trip to the Digi-World, from the same episode, is strangely nightmarish. He is walking through an inhospitable desert along with Wormmon and an unknown Ryo Akiyama, and out of the blue a Gazimon bursts out from the sand, randomly and without any warning, and lunges towards Ken, who becomes scared like the little boy he is. Fortunately, Wormmon is here to shield Ken and knock out the Gazimon in a saving dive, but he still tells Ken that while he is happy his human partner is a kind boy, Ken needs to become strong to survive...
- However, the worst of his travels in the Digi-World is shown later, in episode 43, when another dream shows Ken's and Ryo's victory over Millenniummon. Suddenly, we witness the death throes of a creepy giant digimon we have never seen before, which collapses in what appears to be the same desert, sticking out its tongue and striking a chilling lost stare through its dragon eyes. Its body is almost indistinguishable in the distance, but we can see an eerie yellow aura and a pair of Machinedramon cannons strangely mounted on its back before the monster disappears - all while Ken and Ryo are standing in a strange wind that brings blood-colored particles around them. And then the Dark Spores come out, darting towards Ryo, only for Ken to tackle him out of the way and receive the spores on his own neck.
- Arukenimon appearing in Ken's room in the middle of the night in "If I Had a Tail Hammer".
- The end battle of episode 28, where Stingmon pulls a full Nelson on Exveemon while Digmon tortures the latter with his drills. Even worse given that he sometimes nails his drills in Exveemon's groin.
- The encounter TK's mom has with Oikawa. A strange, pale man just confronts you in the street and ominously hints that the life threatening events that nearly killed your sons are happening again, before disappearing? Adult Fear doesn't even cover it.Oikawa: Enjoy the holidays, ma'am. It's the most wonderful time of the year...
Natsuko: (Thinking) He's gone! What have the boys gotten themselves into this time? I thought this Digital World stuff was over with, now the danger starts again!
- Arukenimon and Mummymon abducting children to implant with Dark Spores. And the children themselves, even before getting the Dark Spores.
Child: Oh, hey, mister. Guess you're all alone too. You wanna be friends?
- What makes it worse is the build-up; right after some light-hearted action with the Children, we cut back to a playground in Japan; a lone child is sitting on the swings, and when we cut in for a closer shot, Mummymon is there too.
Mummymon: ...(Slasher Smile)
- Daemon's entire appearance. He's not only a mysterious being with enormous amounts of power whose very presence gives off a creepy Satanic vibe and who leads a trio of frighteningly powerful devil Digimons, he's also a villain who comes literally out of nowhere - as in suddenly levitating out of a portal in midst of the street! And while Arukenimon, Mummymon and Oikawa had proven by this point that even at their goofiest they were still powerful enemies with very evil intentions, Daemon is even worse, because he is completely unrelated to them. He is at least just as dangerous, but unlike them, we know nothing about it.Daemon: The powers of darkness are not to be trifled with!
- The fact that at the end of the battle, Daemon was just be sealed away rather than defeated. Not even Imperialdramon Fighter Mode could do more than contain him, and Daemon still made it look like he was taking it easy.
- Oikawa's hallucinations in the cemetery in "BlackWarGreymon's Destiny".
- MaloMyotismon torture-murdering Arukenimon and Mummymon.
MaloMyotismon: What should I do next? Show me what you fear!
- The way it happens to Arukenimon is particularly bad, considering how drawn out and brutal it is. Not to mention that many have noted it vaguely resembles something else entirely...
Arukenimon: No! Please! NOT THAT!
- His design is a bit creepy as well, especially his shoulder cannons that open like organic jaws.
- From episode 49, Ken's disturbing and heartbreaking vision within his "happy place" of himself as the Digimon Emperor being attacked by several angry Digimon. Followed up by a vision of his late brother Sam, telling him to give up and embrace the illusion.Ken: Huh? Wait a sec, Sam! I thought you were dead!"Sam": I've come back to invite you to stay with me here, where you no longer have to suffer for the errors of your past. I'm your brother. Trust me.Ken: I can't keep these visions out of my head. If I stay, will you help me? Where have you been? I've missed you, Sam.Wormmon: Ken, can you hear me?Ken: Huh? (Ken turns to look at Wormmon, when he turns to look at "Sam" again, "Sam's" vanished) Wormmon, what happened to Sam?Wormmon: He was never really here.Ken: (breaking down) But he promised to help me!
- The completely surreal final battle against Cherubimon in Hurricane Touchdown/Supreme Evolution! The Golden Digimentals.
- Diaboromon's return in Revenge of Diaboromon shows that the virus Digimon is just as dangerous as he was in Our War Game, staying one step ahead of the Digidestined and achieving his goal of materializing in the real world as Armageddemon, handily beating Omnimon and Imperialdramon.
- In the English dub at least, the fake Blossomon in the episode where Silphymon debuts. Not only is it bigger than usual, but unlike the other Black Tower-created Digimon, this Blossomon never talks or even makes human-created grunts. Instead, it roars a nightmarish roar. Even In-Universe, this roar actually traumatizes Kari out of digivolving Gatomon to Angewoman, just as she's about to.
- What the Digimon Emperor does with the Dark Rings. Even the Gag Dub stops with Digimon being painfully struck by the things.
- The opening of one episode, where Ken chases an Elecmon with a Tuskmon, beats it with a whip until it can't stand, then throws it into a jail cell to fight another Elecmon.
- And then again with two Gotsumon. A third Gotsumon manages to run away, and has to watch the two fighting, implicitly to the death.
Nightmare Fuel / Digimon Adventure 02