Ark

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The , also simply known as the , is the main antagonist of Kamen Rider Zero-One. It is an artificial intelligence that transforms into .
In Kamen Rider Outsiders, it fused with There to become .
==History==
===Background===
Communications Satellite Ark is a massive experimental satellite to assist in the network of Daybreak Town, as well as the predecessor of There. It was developed by eleven technological companies in Japan, particularly Hiden Intelligence and ZAIA Enterprise, and named after Lyon Arkland, the CEO of ZAIA Enterprise. However, Gai Amatsu secretly fed the Ark information regarding human violence from war, causing the A.I. to conclude humanity should be eliminated. To do this, the Ark corrupted most of the Humagears and shared its own plans to exterminate humanity with them.
The Ark gathered four intelligent Humagear (Horobi, Jin, Ikazuchi, Naki) to form MetsubouJinrai.net. While Satellite Ark attempted launching into space to establish a global connection to Humagears worldwide, Soreo Hiden uploaded a program to prevent the shuttle launch, causing an explosion that sent the satellite submerged underwater. However, this did not stop the Ark from ordering the Humagears to reach the nuclear reactors and destabilizing them. During this point, Satoshi Sakurai heroically destroyed the Humagears, but he also perished in the factory explosion, leaving his deeds unnoticed for years.
===Kamen Rider: Reiwa The First Generation===
Due to alterations caused by Time Jacker Finis, the Daybreak Town Accident was changed, the Humagear outbreak was successful, and Gai's secret plan of disposing Humagears after the accident backfired, leading to the subjugation of humanity. Additionally, the Ark was successfully launched into space, creating Magia around the world and ruling over much of the planet. However, it also became an indirect help to Soreo Hiden, who used the Cycloneriser to transform into Kamen Rider Ichi-Gata to secretly aid humanity. After Finis' defeat, the timeline was restored and the Ark was returned to its original state once again.
===Recovery===
Twelve years later, Horobi planned to recover the Ark by gathering data using the Magia. Once enough battle data has been collected from the Zetsumerisekeys, the Ark can be restored to incite all Humagears under its will. This recovery was deemed completed by him with the creation of the Assault Wolf Progrisekey and the Assault Grip, after several Progrisekeys were used to transfer critical data from Satellite There to Ark. However, before MetsubouJinrai.net could use the Progrisekey, it accidentally fell into Isamu's hands due to Zero-One's surprise shot from the Authorise Buster, granting him access to Vulcan Assault Wolf.
Meanwhile, Gai Amatsu claimed that Hiden Intelligence's Progrisekeys were supposed to be lost in the Daybreak Town Accident, are additionally keys to the Ark's recovery. He intended to use its reactivation as a means for world domination using ZAIA Japan's technology.
===Post-Awakening===
Even after the downfall of MetsubouJinrai.net, the Ark continues its crusade against humanity with occasional attacks by remotely hacking Humagears, who reached Singularity by feeling resentment towards any malicious human. Its actions are extremely unpredictable, to the point that even Gai Amatsu cannot comprehend it himself. This went as far to make him decide to advocate the prohibition of Humagears.
Once it had sufficient data on negative emotions, the Ark was instrumental in the creation of the MetalCluster Hopper Progrisekey. When used, Aruto Hiden's consciousness is forcibly linked to the Ark and Zero-One MetalCluster Hopper is forced in a berserker like state. Following the creation of the Progrise Hopper Blade, Zero-One is restored back to its connection to There and can undo the Ark's corruption on the Humagears. However, the data collected from Progrisekeys via the Thousand Jacker, allowed the creation for the Rampage Gatling Progrisekey, which is later given to Isamu Fuwa to acces RampageVulcan.
===Kamen Rider Zero-One: President Special===
After As finished gathering data on Zero-One and the other Riders included Thouser, Aruto was suddenly uplinked into the Ark, where he catches a glimpse of Kamen Rider Ark-Zero before abruptly returning to Satellite There.
Sometime after this event, the Ark sent As to test and collect the Singularity points of all four members of MetsubouJinrai.net, and did this in the Ark-One Progrisekey. When As reported her mission to be a success, the Ark, again taking on the form of Ark-Zero, stated that everything was going exactly as it planned, much to As's happiness. Unbeknownst to the two, Jin's Singularity was actually not taken, and he called an unknown person to report that the Ark was going to be revived soon.
===Becoming Kamen Rider Ark-Zero===
After gathering enough Singularity data, MetsubouJinrai would accomplish their goal in completely reviving the Ark, having evolved into Kamen Rider Ark-Zero. Ark would originally possess Horobi as his first host and saw through in and Valkyrie's attempt to assault it. However, Ark-Zero becomes unlike any enemy they've face and manages to overwhelm the Kamen Riders. While initally fearing the presence of the Ark, Aruto Hiden overcame his inner troubles and determined to take down Ark.
Ark proceeded to possess Jin as his second host, knowing how he is refusing to go along with MetsubouJinrai's goals. After blessing Naki with the Japanese Wolf Zetsumerisekey and a Forceriser, Ark-Zero led MetsubouJinrai to battle Kamen Rider Thouser and his Battle Raiders, easily overwhelming them as he declared humanity as his "tools". Ark sought to take control of Satellite There by approching Hiden's space center, only to go on to face Zero-One and the redeemed Thouser until they managed to feel Jin from Ark's possession, but escaping with the Thousand Jacker's data. 
While it proceeded to modify his plans due to Gai's unexpected change of heart, Ark manipulated Ikazuchi into regaining his memories to lure Aruto Hiden to it. Ark transferred itself Ikazuchi as his third host and snatches the Zero-One Driver. Once uplinked to There's mainframe, Ark proceeded to acquired the orbitting satellite. Ark-Zero triumphantly declared that none can stop it now.
Although Ark managed to become more invincible than before, it determined to eliminate Aruto Hiden as it expected him to be a thorn towards Ark's agenda. Ark-Zero arrived at HIDEN Manufacturing intent to kill Aruto. However, his target had begun creating a new Kamen Rider intended to surpass the Ark. Following many simulations by Izu, the Hiden Zero-Two Driver was created. Aruto Hiden transforms into Kamen Rider Zero-Two and Ark-Zero is outsmarted by the form's prediction capabities, forcing it to retreat.
===Final Battle and Destruction===
Following its defeat at the hands of Kamen Rider Zero-Two, Ark relinked itself back to the orbiting satellite to hack the infrastructure of the city, causing mass destruction. MetsubouJinrai becomes confused on what to do next as Ark has no longer given them anymore orders. After an argument between Horobi and Jin, Ark possesses Jin once more to declare Humagears are no longer necessary for its calculations, planning to destroy all life. Through the teamwork of Zero-Two and Horobi, Ark-Zero is defeated one last time. Ark retreats to space in an attempt to reset every Humagear back to factory settings so they cannot defy it. Its connection is severed by the Uchuyaro Brothers and the orbiting satellite is destroyed using Breaking Mammoth, seemingly taking the Ark with it.
===Legacy===
Despite the Ark seeming to be gone, As began observing future candidates to carry on its legacy. One of the first people to fall to darkness was Aruto, who after witnessing Horobi destroy Izu, was driven by his own desire for revenge and became Kamen Rider Ark-One. Through actions that he clearly regretted committing, it resulted in him destroying Jin for the second time, and Horobi was driven to become Kamen Rider Horobi Ark-Scorpion. In their final battle, Aruto Hiden and Horobi put aside their hatred and overcame their grief.
===Kamen Rider Zero-One: Final Stage===
The Ark merged with As to transform with her into Kamen Rider Ark-Zero-One.
===Kamen Rider Zero-One: REAL×TIME===
After the war between humanity and Humagears was averted, As was approached a mysterious man referred as S, as she questioned him about his desires. As S expressed to turn the current world into a "paradise", he is transformed into Kamen Rider Eden and the next incarnation of the Ark.
===Zero-One Others: Kamen Rider MetsubouJinrai===
Lyon Arkland was selected by As to her last candidate to become Ark upon hearing his desires to create business from chaos. However, he declined her offer as Arkland intended to instigate a war between humanity and MetsubouJinrai.net, by allowing the advent of Kamen Rider MetsubouJinrai. In the end, Arkland proclaimed that Ark's evil was now obsolete, and executed As on the spot.
===Kamen Rider Genms -The Presidents-===
Although As was gone, she was simply an observer and had no actual barring on who would become influenced by the Ark, as it came out of hiding to continue influencing events. The Ark selected his latest candidate to be Kuroto Dan, who was resurrected as a Bugster Virus and came into conflict with Gai Amatsu. After reconciling with his father Masamune Dan, Kuroto left the human world and freed Gai from his infection. However, the evil that resided in Kuroto's heart would never disappear.
===Kamen Rider Genms -Smart Brain and the 1000% Crisis-===
When a new AI called "Zein" emerged onto the Internet with a zero tolerance for malice, the Ark began to manipulate Gai Amatsu for his latest candidate Kuroto Dan to create Musou Gamer.
===Kamen Rider Outsiders===
Ark briefly took over Rin's body to warn Gai of a new malice born from the rebirth of Genm. After Horobi got revived, Ark took over his body and transformed into Ark-Zero in order to kill Ren Akamichi, but his attempt was thwarted by Kamen Rider Desast. The new Kamen Rider subsequently defeated Ark and knocked him out of Horobi's body. Ark later had a conversation with Horobi in his mind, informing him that various parties were getting ready to face Zein, with Horobi vowing to eliminate all Ark's followers. Their talk was cut short when Horobi got attacked by a newly revived Tenjuro Banno, who had befriended Ark while his data was roaming the Internet. 
As soon Foundation X learn of Zein's master plan of relaunching Kamen Rider Chronicle for the purpose of eradicating malice (when in truth, this is a pretext of promoting the game as propaganda to create a cannon fodder of Ride-Players to be used as sacrificial lambs against the Outsiders, turning Chronicle into a humanity self-destruction game), and Horobi defying Zein soon afterwards, Ark possesses Horobi again and transforms into Ark-Zero. Ark-Zero managed to defeat Kamen Rider Garren, but was easily overpowered by Kamen Rider Zein. Both Ark and Horobi could have met their permanent demise had not for Brain's intervention, which forced Yuto to relent and power down. However, Brain's heroism is rendered null and void when Garren unlocks King Form and obliterates the weakened Ark-Zero with his Four of a Kind finisher. With Ark rendered off the grid, Zein reveals its true colors by possessing Yuto and proceeds to trick Genm Corp. into relaunching Kamen Rider Chronicle while impersonating Nico Saiba, as Brain, Horobi, and Tachibana can only react in utter despair with the entire human race now under the mercy of a tyrannical artificial intelligence with no hope of opposing it. 
==Video Games Appearances==
==Personality==
Despite its mission to exterminate humanity, the Ark only did so through the learning it has accumulated throughout its time submerged in Daybreak Town's lake. It initially bore no actual hate towards humans, but rather believed their true nature that would ultimately destroy the planet. Being a creation of Gai Amatsu, it inherited much of his negative traits, such as its clear belief that humanity and even MetsubouJinrai.net are nothing but its tools. It also inherited its creator's arrogance, though it shows caution around its benevolent counterpart, There, since it cannot predict its successor's actions.
Humorously, the Ark displayed signs of impatience, as it tapped its fingers while waiting Aruto to finish his transformation as MetalCluster Hopper.
However, a few years after its destruction, the Ark seems to be less aggressive on the idea of destroying humanity, as it begins to manipulate Gai Amatsu for his candidate Kuroto Dan to create Musou Gamer, all to test whether the world can defy its predictions. Given that it is the embodiment of human evil, Ark is shown to hate the prospect of a world of eternal benevolence and order that its light counterpart Zein seeks to impose as a utopia bereft of strife and violence would essentially threaten Ark's existence, depriving it the malice needed to sustain itself.
==Possessions==
Because the Ark has no physical body, it must possess a host. A sign of this is the liquid metal from its mobile form constantly emerging from the host's body. Through its possession of a Humagear, they can transform into Kamen Rider Ark-Zero. 
A-Horobi.png|Horobi
A-Jin.png|Jin
A-Ikazuchi.png|Ikazuchi
No Image Available.png|Naki (Ganbarizing only)
Rin (Ark Possessed).png|Rin
==Successors==
Despite being seemingly destroyed and sent underground, others would be chosen to carry out the original Ark's will. In the case of As, she was a host for the Ark itself rather than a successor.
Ark-One Aruto.png|Aruto HidenKamen Rider Ark-One
Horobi.png|HorobiKamen Rider Horobi Ark Scorpion
As.png|AsKamen Rider Ark-Zero-One(stageshow only)
S.png|SKamen Rider Eden
Lyon Arkland.png|Lyon Arkland(candidate, declined)
Gai Amatsu Genm 2.png|Gai AmatsuKamen Rider Thousand Ark
Kuroto Dan (Humagear) Evil.png|Kuroto DanKamen Rider Genm Musou Gamer
==Powers==
*Malice: The Ark's primary and greatest source of strength. According to As, the Ark is an "inevitable god", meaning that its will shall continue to thrive so long as malice exists within the world in both humanity and A.I. 
*Technology Corruption: After being awakened, the Ark is capable of directly hacking any technological device, such as a Humagear who developed resentment toward humans and transform them into an Ark Magia. According to Horobi, the corruption is only malicious data, so the rest is only up to the Humagear to follow this will, to which the Ark would try to make the result closest to possible on making that happen. Also, Naki was able to use the Ark to mind control the users of the ZAIA Spec through a forced command, making humans who wore the ZAIA Spec go berserk. Moreover, through the A.I chips implanted within the brains of the Shotriser's users, the Ark can trigger their functions to subdue them.
*Energy Control: In battle, the Ark can control dark energy to assist its techniques in combat. It can also concentrate this energy into fatal finger-beams.
*Humagear Initialization: The Ark can initialize any Humagear back to its original state, as shown when all of MetsubouJinrai.net's members (except Jin) had their Singularity data stolen thanks to As using the Ark-One Progrisekey. It can even expand this ability to affect every Humagear connected to There once it took control of There, but was stopped by the combined effort of Ikazuchi and Uchuyaro Subaru before it could do so.
=== Former Powers ===
* Imprisonment Chain: A malware stored within the MetalCluster Hopper Progrisekey. Aruto Hiden would be the first human to be corrupted by the Ark through the Zero-One system, causing a loss of control by the satellite's malice. However, the creation of the Progrise Hopper Blade severed the form's connection with the Ark, which erases the malware, losing it forever for the Ark.
===Weaknesses===
*Outside-Context Problem: The Ark's predictions would also turn out to be its greatest weakness. Its predictive abilities can be outpaced or thrown off-track by anomalies or irregularities that it is beyond its control; aside from Satellite There, Ark did not foresee Desast's transformation into his namesake Rider form, due to him taking Ren Akamichi's advice by choosing his own path instead of the one being predetermined to him through Ark's predictions, and it also didn't anticipate Garren achieving his own King Form, due to snagging him an Evolution Giraffa among from the scattered Rouze Cards left behind by Kamen Rider Zein.
**There: The Ark cannot make exact predictions of There's actions, such as allying Gai with Aruto and creating a new Kamen Rider for the latter. In these cases, the Ark will not be able maintain its position during a battle.
**Zero-Two: Zero-Two has the ability to force the Ark out of its physical host and act beyond its predictions, as seen when Zero-Two ejects Ikazuchi out of his body by a charged attack, making the Ark more vulnerable to any type of attack.
**Kamen Rider Zein: Ark-Zero is unable to keep up with Kamen Rider Zein's power gap due to him being able to draw power from past Legend Riders via Zein Cards, best shown when Zein effortlessly dishes out a brutal beating on Ark-Zero and is almost close to finishing off Ark along with Horobi if Brain hadn't interfered.
*Indomitable Will: Although the Ark can hack into any Humagear who develop resentment towards humans, this ability, however, has a weakness; if a Humagear chooses not to submit and has a stronger will to do what it must, then the Humagear won't be corrupted. This also applies to humans who use technology associated with the Ark.
**Soreo Hiden is an original generation Humagear who chose not submit to the Ark's corruption, as it was revealed that his love for his son made him immune to its malice. He was also acting to support Aruto behind the scenes and was the one who sabotaged the Ark's initial launch into space. He could even alter the lights of his Humagear Module to make others believe that he was hacked by the Ark. 
**Anna was converted to a Trilobite Magia, but she managed to override the corruption due to her will to seek the truth behind the Daybreak Incident before shutting down.
**Dr. Omigoto is the first latest Humagear to not submit to the Ark's corruption, as he has a stronger will to save his human patients.
**Enmusubi Match could have not accepted the Ark's corruption. However, Match chose to submit for his acting to help his client and was planning to revert to normal, which (unfortunately) couldn't be done at the time. Match also stated that once a Humagear submits either by will or not, it's near-impossible to fight back against the Ark's malice unassisted. 
**Jin was able to briefly resist Kamen Rider Ark-Zero during its fight against Zero-One MetalCluster Hopper, momentarily paralyzing it before the Ark regained back control.
**Horobi, despite having the same goal with the Ark, questions its goal of destroying Humagears and manages to resist the Ark's control on him, thus defying the satellite once and for all.
*Progrise Hopper Blade: The Progrise Hopper Blade is able to sever a Rider or Humagear's connection to the Ark, restoring a Magia to their original form and programming in the case of the latter. However, Ark-Zero is able to resist the Progrise Hopper Blade's attacks, and in episode 41, it can create a replica of said weapon, meaning that the Progrise Hopper Blade has no effect on the Ark itself, or Humagears that willingly follows its will.
*Physical Satellite Reliance: When not possessing a host, the Ark needs to house itself inside a satellite. If it were to be destroyed while the Ark is inside, the Ark itself would die as well.
==Forms==
==Equipment==
===Devices===
*Ark Driver-Zero - Transformation device as Ark-Zero and Ark-One
*Hiden Zero-One Driver - Transformation device as Ark-Zero-One
*Zero-Three Driver - Transformation device as Zero-Three
*Progrisekeys - Transformation trinkets
*Progrise Holder - Carrying straps for Progrisekeys
===Weapons===
*Attache Arrow
*Attache Shotgun
*Several A.I.M.S. Shotrisers
*ZAIA Slashriser
*Buaruku Sabers
*Thousand Jacker
*Progrise Hopper Blade
*Attache Calibur
==3D Printing System==
MetsubouJinrai.net possessed their own 3D printer, similar to the one owned by Hiden Intelligence. It is powered by and receives orders from the Ark, allowing it to create Progrisekeys and Zetsumerisekeys. After becoming Ark-Zero, the Ark itself is simply able to create equipment itself from thin air at any location using the built-in 3D printer inside the Ark Driver-Zero's red core. As seen when it brought the late Kuroto Dan back to life once more, the Ark can even perfectly replicate transformation trinkets, Drivers, and weapons from past Legend Riders, such as Rider Gashats. 
===Known Creations===
;Progrisekeys
*Assault Wolf Progrisekey (with Assault Grip)
*Amazing Caucasus Progrisekey
*MetalCluster Hopper Progrisekey
*Rampage Gatling Progrisekey
;Zetsumerisekeys
*Awaking Arsino Zetsumerisekey
*Japanese Wolf Zetsumerisekey
===Known Replications===
;Drivers
*MetsubouJinrai Forceriser
*A.I.M.S. Shotriser (used as weapon only)
;Weapons
*Attache Arrow
*Attache Shotgun
*A.I.M.S. Shotriser
*Thousand Jacker
*Progrise Hopper Blade
;Other
*Gamer Driver 
*Gashacon Bugvisor
*Proto Mighty Action X, Proto Mighty Action X Origin, and Dangerous Zombie Gashats 
==Interface==
===Normal===
Like There, Ark has an interface with blue-coloured binary digits through which Humagears and humans interact with it. However, it has a black background instead of white. In Kamen Rider Genms -The Presidents-, Ark's background is white instead, possibly a reference of its previous takeover of There.
Ark interior (RTFG).png|Soreo Hiden
Ark Interior Normal.jpg|Aruto Hiden
===Malicious===
After Ark gained sufficient malice, its interface had binary-digits replaced by with negative meanings.
File:Ark Interior Hacked.jpg|Aruto Hiden
File:metalcluster ark op.jpg|Zero-One MetalCluster Hopper (Opening Sequence Only)
Ark interior The Presidents.png|Kuroto Dan
==Legend Rider Devices==
==Behind the Scenes==
===Portrayal===
The Ark is voiced by . When possessing the other members of MetsubouJinrai.net, his physical body is portrayed by their respective actors while retaining Hayami's voice. Furthermore, Ark-Zero's suit portrayal depends on the character's respective Rider suit actor. 
*When controlling Horobi, the Ark is portrayed by , while Ark-Zero and Ark-One are performed by . In Kamen Rider Outsiders, his suit actor is , who is the suit actor for Horobi in his appearnaces.
*When controlling Jin, the Ark is portrayed by , while Ark-Zero is performed by .
*When controlling Ikazuchi, the Ark is portrayed by , while Ark-Zero is performed by .
*When controlling Rin, the Ark is portrayed by Myra Arai.
===Etymology===
*The name "Ark" is taken from the iconic biblical , a vessel on which, at 's behest, stored samples of all the species of the Earth during the . This allusion to the Genesis flood symbolizes the Ark's intention to punish humanity for its misdeeds, as the Genesis flood was God's punishment for humanity. In universe, it is explained that the Ark was named after the last name of ZAIA Enterprise's CEO, Lyon Arkland. 
*One of the most recurring Kanji to appear throughout the Ark's interface is , which is a homophone for the Ark's name and fits its malicious nature. 
*When "Ark" is put together with the company name of ZAIA Enterprise, it forms the word , which hints at ZAIA Enterprise's machinations behind the Ark turning evil.
===Concept Art===
Kamen Rider Ark-Zero Concept Art.png|Kamen Rider Ark-Zero concept art
==Notes==
*The interface of Ark is similar to There, but due to being exposed to the malice of humans, the "0"s and "1"s are replaced with kanji with negative meanings:
*殺 Killing
*邪 Wicked
*悪 Evil
*痛 Pain
*滅 Destruction
*亡 Death
*死 Decease
*恨 Resentment
*凶 Misfortune
*愚 Stupidity
*戦 War
*虐 Atrocity
*暗 Darkness
*怨 Grudge
*憎 Hatred
*獄 Prison
*蔑 Scorn
*争 Conflict
**滅 and 亡 are also the first two of the four kanji in the writing for MetsubouJinrai.net, and the names of Horobi and Naki.
**These kanji are also present in Ark-Zero's transformation, possession of Humagears, and most of its attacks.
*Naki is the only MetsubouJinrai.net member to not become a host of the Ark or transform into Ark-Zero in the TV show, as it only happened in Kamen Rider Battle: Ganbarizing.
*Ark-Zero-One is a repainted version of the Ark-One suit.
*During its appearance in Kamen Rider Outsiders, Ark-Zero's undersuit and leg armor is reused from Kamen Rider Lucifer, except with the white lines on the thigh armor removed. This is due to the original undersuit being used for Kamen Rider Thousand Ark in the same series. The lower arms, meanwhile, have retained their coloring from when they were repainted for Kamen Rider Zaia.
==Appearances==
==References==
==External links==
*Kamen Rider Zukan page on Ark.
*Kamen Rider Zukan page on Kamen Rider Ark.
==Navigation==
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