History NightmareFuel / KamenRiderOOO

* [[TheBerserker Pu]][[SuperpoweredEvilSide To]][[AnIcePerson Tyra]]. Not only is it monstrously powerful, but it can't distniguish friend from foe, and even when there are two [[ChromeChampion Births]], they aren't enough to keep it down. Things get worse when it's revealed that the Dinosaur Greeed is technically dead, meaning that the Purple Medals turn whoever uses them into Greeed, slowly turning Eiji into a monster. It's not only horrible for the audience, but it's just as bad in-universe, too. There's a ''very'' good reason that Eiji sticks to Tajadol in crossovers.

* The two Pternodon Yummies are among the strongest yet. And their unique ability is to release a black mist that causes anyone within to... just vanish on the spot. They end up taking a ''huge'' amount of victims this way, including ''[[WouldHurtAChild children]]''. And by the episode's end, [[KillEmAll not one of the victims is shown to come back in any way...]]

* Who's the villain? [[GreaterScopeVillain The Ancient King/The First Kamen Rider OOO]]. The series' UltimateEvil, a tyrant so greedy and evil his desire eclipses even the Greeed, who's desire is to obtain godhood and conquer the entire world, [[BackFromTheDead is back.]] And he lives up to it: being an immensely destructive, monstrous tyrant who proves as nigh unstoppable as he was made out to be.

* Eiji's Greeedification is getting worse. ''Much'' worse. His meltdown as he desperately tries and fails to suppress his transformation is not pleasant to watch.

* '''[[AndThenJohnWasAZombie Eiji Greeed.]]''' That's all you need to know.

* Who's the villain? [[GreaterScopeVillain The Ancient King/The First Kamen Rider OOO]]. The series' UltimateEvil, a tyrant so greedy and evil his desire eclipses even the Greeed, who's desire is to obtain godhood and conquer the entire world, [[BackFromTheDead is back.]]

** And he’s [[DiscOneFinalBoss not even the ultimate enemy]]. That honour goes to a new Greeed called Goda, [[spoiler: who has been inhabiting Eiji’s corpse and posing as him the whole time]].

* Thanks to Maki, Eiji has now turned into a fully-formed Greeed in a process that not only sends him out of control, but sounds painful, too.

* Mezool ends up taking a massive amount of Cell and Core Medals to become a monster that wouldn't look out of place in a ''Franchise/SuperSentai'' mecha battle. But OOO has to fight this gigantic, destructive monster all by himself. Emphasis on ''destructive'', as during the fallout, Eiji expresses doubt as to whether he can beat the Greeed if they get like this. It's only thanks to the intervention of the newly-debuted Kamen Rider Birth that Eiji is able to get the upper hand with the [=GataKiriBa=] Combo.

* This episode goes into further detail on the first Kamen Rider OOO, the King from 800 years ago. It also reveals that the King was a power-hungry tyrant who wanted to [[GodhoodSeeker become a living god]] with the Core Medals. He also worked alongside Ankh, only to literally backstab him and rip out his Core Medals with the [=TaToBa=] Combo's claws. It looks uncannily similar to Ankh [[AndShowItToYou having his heart ripped out]], which, in a sense, he kind of did.

* [[TheBerserker Pu]][[SuperpoweredEvilSide To]][[AnIcePerson Tyra]]. Not only is it monstrously powerful, but it can't distniguish friend from foe, and even when there are two [[ChromeChampion Births]], they aren't enough to keep it down. Things get worse when it's revealed that the Dinosaur Greeed is technically dead, meaning that the Purple Medals turn whoever uses them into Greeed, slowly turning Eiji into a monster. It's not only horrible for the audience, but it's just as bad in-universe, too. There's a ''very'' good reason that Eiji sticks to [=TaJaDol=] in crossovers.
** Worse is that when Eiji transforms into [=PuToTyra=] for the first time, the Medals fly into the Driver by themselves, and the scanner floats across them without Eiji even touching it. What's worse than a berserker mode? How about a berserker mode with a mind of its own?

* Ankh (Lost)'s death. As [[SugarWiki/AwesomeMoments awesome]] as it is, his death is... unsettlingly brutal. Ankh (Lost) doesn't just get the standard explosion and fireball, oh no. Ankh (Lost) has his wings mercilessly severed by a berserk [=PuToTyra=], and after he's crashed to the floor from on high, he's left rolling around whimpering in agony. Then Ankh (Lost) is finished off from a single slash from the Medagabryu that ''shatters three of his Core Medals''. Another testament to the sheer mercilessness of that Combo.

* After losing to OOO and having his personal Core Medals badly damaged by [=PuToTyra=], Kazari is left dropping Cell Medals after escaping in a manner that eerily resembles [[SymbolicBlood blood]]. And then Maki shows up and coldly rips out Kazari's remaining Core Medals, declaring that [[YouHaveOutlivedYourUsefulness he has no further use for him]] (which, again, looks like a Greeed [[AndShowItToYou having their heart ripped out]]). We then have the... erm, "pleasure" of watching Kazari slowly dying as he staggers through the busy city streets, everything being a blur until he disintegrates into a pile of Cell Medals, his cracked, personal Core Medal rolling away and crumbling to dust. [[AssholeVictim It's undeniably satisfying given how much of a shitbag Kazari was]], but it's still surprisingly gruesome.

** Even worse is how it all transpires. After taking a [=TaToBa=] Kick, Uva gets Core Medals thrown into him by Maki, with it looking like Maki came to help him. And then Maki throws some more. And some more. Uva protests, but Maki doesn't listen, throwing more Core Medals as Uva continues writhing around in pain. And later, Uva is shown completely alone in total agony in the middle of a junkyard, begging for help before he transforms into the Medal Vessel. Uva may have been a total dick, but you can't help but [[AlasPoorVillain feel for him]].

[[folder:10th Anniversary]]

* Who's the villain? [[GreaterScopeVillain The Ancient King/The First Kamen Rider OOO]]. The series' UltimateEvil, a tyrant so greedy and evil his desire eclipses even the greed, who's desire is to obtain godhood and conquer the entire world, [[BackFromTheDead is back.]]

** Maki's panic attacks whenever his doll is "hurt". It's the only moment he shows an emotion, like EVER! And it is not the best.

* Kougami's Ridevendor squadron get massacred by the newly-resurrected Greeed. This itself is bad enough, but there's also a ''massive'' case of SoundtrackDissonance thanks to the operatic version of [[HappyBirthdayToYou Happy Birthday]] in the background. This somehow makes the whole scene so, ''so'' much worse.

* Kazari inconspicously kidnapping Hina and putting her in a van. Not helped by the fact that he did that with a smile on his face plus as part of his leverage towards Eiji and Ankh.
* Kazari yanking Mezool's Medals from her body, leaving her with one, causing her to limp away.

* Uva attempting to seize Mezool's remaining Medal inside her, not helped by the fact at how helpless she is at the time or how Uva sends Waste Yummies after her when she escapes him.

** At the end of the episode, for some reason the Medals fly out of their case and into Eiji, who is very far away from them. And they ''enter his body like he was a Greeed''. This causes him to fall over unresponsive with a dead-eyed stare and his eyes glowing purple with the scream of a pterodactyl in the background. Just what the hell ''are'' these Medals?!

* The revelation that Date has a serious injury that has been affecting his performance in combat. How bad is it? Well, its a fairly minor case of ''bullet lodged in his brain''.

* The Umi-Armadillo Yummy causing massive sleep problems towards the victims of his struck by its spines, amking them desire to be able to sleep.

* At the end of the episode, Ankh (lost) inconspicously in the room with Ankh, the latter being unable to fight back in time as the former absorbs him into himself, with Eiji and Hina unable to do anything but watch him in peril.

* The Ankylosaurus Yummy freezing a victim calling out Eiji for help, then shattering him. And yes, he does not get restored.

* The opening episode features Kougami's Ridevendor squadron being massacred by the newly-resurrected Greeed. This itself is bad enough, but there's also a ''massive'' case of SoundtrackDissonance thanks to the operatic version of [[HappyBirthdayToYou Happy Birthday]] in the background. This somehow makes the whole scene so, ''so'' much worse.
* Every single time Eiji has a flashback to the young girl he made friends with dying from the missile attacks. Eiji's breakdown as a result is also never easy to watch.
* The massive Yummy from the second episode. It takes on a bug-like appearance, with the upper portion of the body being a set of creepy grasping hands.
** The amount of destruction it causes is pretty sickening, having snapped a high-rise building in two like a twig, and practically gutting another one. As bad as things were, if Eiji didn't show up, they probably could've turned out a thousand times worse.
* The poor victim of episode 3 has his greed magnified to the point where he eats uncontrollably. At first, he's ravenous, but later he starts to complain that it hurts and that he doesn't want to eat any more as he uncontrollably continues to gorge himself. That's right, his body is feeling the effects of extreme overeating, [[AndIMustScream and he's fully aware the entire time]]. He later starts begging for help as he batters aside anyone who gets close, and he's even warned that he'll split his stomach. If things had gone differently, this hapless victim would have suffered a gruesome and very painful death.
* Episode 5 shows us how Mezool makes Yummies. That is, she creates clusters of eggs for multiple Yummies to hatch from when they've been sufficiently fed by the host's greed. Some of the framing of the victim as the eggs incubate behind her is very creepy. It almost feels like a horror movie in places.

* Episode 10. Not only is the bomber extremely unsettling, especially when you consider how close they all were to exploding (Eiji managed to stop with [[JustInTime one second to spare]]), but there's what Maki does at the lab. He knows one of Mezool's nests are there and they're ready to hatch. So he decides to put the whole place on lockdown, with all the scientists inside and the Yummy's starting to hatch, ''just to see what would happen.''
* Episode 13 has the Yummy host (who is a surgeon) coming after Eiji with a bunch of scalpels on a claw glove that looks straight out of the arsenal of [[Franchise/ANightmareOnElmStreet Freddy Krueger]]! Yikes!
* Episode 16. Mezool ends up taking a massive amount of Cell and Core Medals to become a monster that wouldn't look out of place in a ''Franchise/SuperSentai'' mecha battle. But OOO has to fight this gigantic, destructive monster all by himself. Emphasis on ''destructive'', as during the fallout, Eiji expresses doubt as to whether he can beat the Greeed if they get like this. It's only thanks to the intervention of the newly-debuted Kamen Rider Birth that Eiji is able to get the upper hand with the [=GataKiriBa=] Combo.
* Episode 20. This victim this week is simply unsettling. This one has a desire for {{revenge}} against his former partner who served as an informant, as well as Shingo, who put him away. Hearing his unhinged, bloodthirsty yelling throughout the episode is decidedly unpleasant. To say nothing of the ungodly-strong Yummy that an empowered Kazari makes from him.
* Episode 21. The victim, after being cured of the Yummy, manages to catch his ex-partner. The latter is last seen being angrily tied up by the former. [[FridgeHorror Considering that the both of them are left on a pier]]...
* Episode 24 is a mostly-lighthearted episode, but it also contains a surprisingly-graphic shot of the VictimOfTheWeek's puncture wound, consisting of a fragment of metal stuck in her with blood surrounding it. [[WhatDoYouMeanItsForKids You'd expect this kind of wound on an adult-oriented crime drama!]]
* Episode 29's Yummy is mostly normal-looking as far as Yummies go, but on top of it seeming to go around breaking people's spines with [[BearHug bear hugs]], it seems to have a second face in place of one of its eyes... eugh...
* Episode 30 reveals Professor Maki's FreudianExcuse and the extent of just how utterly ''screwed up'' he is. His sister served as a ParentalSubstitute, but when she was due to get married, she was happy to abandon her much-younger brother and leave him with her doll. His reaction? ''[[EnfantTerrible Cause a fire that burns her to death in her sleep]]''. Making matters worse is the fact that Mozart's Requiem is playing throughout most of the scene.

** This episode goes into further detail on the first Kamen Rider OOO, the King from 800 years ago. It also reveals that the King was a power-hungry tyrant who wanted to [[GodhoodSeeker become a living god]] with the Core Medals. He also worked alongside Ankh, only to literally backstab him and rip out his Core Medals with the [=TaToBa=] Combo's claws. It looks uncannily similar to Ankh [[AndShowItToYou having his heart ripped out]], which, in a sense, he kind of did.
* Episode 31 reveals a new set of purple Core Medals that Kougami brought back from Europe, that he was keeping separate from the rest of the collection. And the usually-jovial Kougami is shown to be [[OOCIsSeriousBusiness troubled]] by whatever Greeed is linked to these Medals...

* The two Yummies that appear in episode 32 are among the strongest yet. And their unique ability is to release a black mist that causes anyone within to... just vanish on the spot. They end up taking a ''huge'' amount of victims this way, including ''[[WouldHurtAChild children]]''. And by the episode's end, [[KillEmAll not one of the victims is shown to come back in any way...]]
** [[TheBerserker Pu]][[SuperpoweredEvilSide To]][[AnIcePerson Tyra]]. Not only is it monstrously powerful, but it can't distniguish friend from foe, and even when there are two [[ChromeChampion Births]], they aren't enough to keep it down. Things get worse when it's revealed that the Dinosaur Greeed is technically dead, meaning that the Purple Medals turn whoever uses them into Greeed, slowly turning Eiji into a monster. It's not only horrible for the audience, but it's just as bad in-universe, too. There's a ''very'' good reason that Eiji sticks to [=TaJaDor=] in crossovers.
*** Worse is that when Eiji transforms into [=PuToTyra=] for the first time, the Medals fly into the Driver by themselves, and the scanner floats across them without Eiji even touching it. What's worse than a berserker mode? How about a berserker mode with a mind of its own?
* Episode 35 reveals that Date has a serious injury that has been affecting his performance in combat. How bad is it? Well, its a fairly minor case of ''bullet lodged in his brain''.
* Episode 42. Eiji is mentioned to be slowly turning into a Greeed thanks to all of the purple Core Medals inside him. But so is Maki, who is ''far'' further along in the process than Eiji. He starts out by showing his already Greeed-ified arms. But he is shown later by way of ShadowDiscretionShot to undergo some painful-sounding BodyHorror as his shape changes rapidly to that of a Greeed.
** Ankh (Lost)'s death. As [[SugarWiki/AwesomeMoments awesome]] as it is, his death is... unsettlingly brutal. Ankh (Lost) doesn't just get the standard explosion and fireball, oh no. Ankh (Lost) has his wings mercilessly severed by a berserk [=PuToTyra=], and after he's crashed to the floor from on high, he's left rolling around whimpering in agony. Then Ankh (Lost) is finished off from a single slash from the Medagabryu that ''shatters three of his Core Medals''. Another testament to the sheer mercilessness of that Combo.
* Episode 44. After losing to OOO and having his personal Core Medals badly damaged by [=PuToTyra=], Kazari is left dropping Cell Medals after escaping in a manner that eerily resembles [[SymbolicBlood blood]]. And then Maki shows up and coldly rips out Kazari's remaining Core Medals, declaring that [[YouHaveOutlivedYourUsefulness he has no further use for him]] (which, again, looks like a Greeed [[AndShowItToYou having their heart ripped out]]). We then have the... erm, "pleasure" of watching Kazari slowly dying as he staggers through the busy city streets, everything being a blur until he disintegrates into a pile of Cell Medals, his cracked, personal Core Medal rolling away and crumbling to dust. [[AssholeVictim It's undeniably satisfying given how much of a shitbag Kazari was]], but it's still surprisingly gruesome.

* Episode 45. Maki shows off some of his power as the Kyoryu Greeed, and casually levels the area around him in one move.
** The complete Mezool rampaging through a group of citizens, kidnapping women [[WouldHurtAChild and children]] due to her obsession with love. Though it's mitigated when they're shown in Yummy eggs, which likely disappeared upon Mezool's death, it's still disturbing to see a wave of water sweep through and make people's families disappear from their sides and leave nothing but empty strollers behind.
* Episode 46. Eiji's Greeedification is getting worse. ''Much'' worse. His meltdown as he desperately tries and fails to suppress his transformation is not pleasant to watch.
** Gamel brutally turning people into Cell Medals, killing them on the spot.
** Thanks to Maki, Eiji has now turned into a fully-formed Greeed in a process that not only sends him out of control, but sounds painful, too.
* Episode 47. The Eijii Greeed is shown to be monstrously strong, thanks to Maki tossing more Purple Medals into him. If Ankh wasn't there, poor Eiji would've gone completely berserk and very likely ended the world, all without feeling a thing.
** Maki pulls a YouHaveFailedMe on Ankh, ripping out all but his personal Core Medal. Ankh is later shown in a huge pool of Cell Medals that is obviously meant to resemble a big pool of [[SymbolicBlood blood]].
** The complete Uva somehow manages to be the worst complete Greeed yet. He causes a massive amount of devastation with his [[ShockAndAwe lightning]], and starts absolutely wiping the floor with the two Births and Eiji, forcing the latter to run back to Kougami and accept his offer of the infinite amount of Cell Medals.
* Episode 48. Uva finally goes out of control from too many Core Medals. We finally get to see what happens after all this time, and JEEZUS, it's a biggun. Literally, too. Uva turns into this strange stone construct with rings of all the colours of the Core Medals surrounding it that floats in the sky, rapidly turning everything around it, buildings and cars alike, into Cell Medals. Worse is that it spews Trash Yummies by the bushel. In a few moments, the city looks like something out of a ZombieApocalypse.

** Maki is on the receiving end of a nasty death, worthy of a BigBad, but still grotesque. He gets a flaming black hole launched at him by Eiji and Ankh, which rips him to pieces as it sucks him in, as he calmly expresses joy in his death finally completing him. It's both awesome and somewhat-terrifying all at once.