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At the time of its opening, the Rockman Zero Collection website included a timeline detailing the events which marked the transition from the Mega Man X series to the Mega Man Zero series. This timeline was since removed from the site, but it gained notoriety for the new revelations about the storyline, with potentially controversial details. The translation can be seen below.



Reploids… those are robots made a time long ago who were near human and had limitless potential… Given individuality by means of advanced technology, the Reploids worked for humans and were meant to be the greatest ally to walk alongside mankind… However, trouble silently built up among the gears between humans and Reploids that beneath these peaceful times… Having limitless potential and being near human, it was only a matter of time before the Reploids would oppose humans. These kinds of dangerous Reploids the humans fearfully called Mavericks… Reploids that became Mavericks were disposed of by their own Reploid brethren… This was the response humans devised… For the Reploids trying to protect their human masters, there was no room for choice. Thus a violent war between the Reploids that seemed to have no end erupted… Numerous battles accumulated… time went on… and even with the creation of the human utopia protected by Reploids, Neo Arcadia, the struggles haven’t ended…

At least 200 years ago: The birth of X

200年以上前 エックス誕生
When an incident occurred where an unknown computer virus came from space and causes robots to become violent and riotous, Dr. Light completed the battle robot “X” worrying about the future of Earth. Hypothesizing X could battle robots infected by viruses, he gave X the perfect virus counter-measure. Meanwhile Dr. Light developed a great number of armors, but this presented the possibility of X becoming a threat to mankind. To confirm the safety of X’s cognition program, Dr. Light sealed away X in an analysis capsule.

1XX years ago: The birth of Zero

1XX年前 ゼロ誕生
Zero was produced by Dr. Wily, who schemed at taking over the world. But he contained a flaw in his cognitive program that made him violent and unwilling to obey instructions, so Dr. Wily himself sealed Zero in a capsule.

1XX years ago: X is discovered

1XX年前 エックス発見
X is discovered by Dr. Cain, having been buried underground for 100 years.

1XX years ago: The birth of Repliroids

1XX年前 レプリロイドの誕生
Dr. Cain carried out his research of X, and using this created highly advanced robots called “Repliroids.”

1XX years ago: The Sigma Virus outbreak

1XX年前 Σウィルス発生
A subspecies of the terrible computer virus from long ago is generated, and begins driving robots mad locally. The human leadership acknowledges these infected robots as Irregulars, and orders them to be disposed of. The source was found to be an unknown computer virus that had prevailed over 100 years ago emerging from the capsule Zero slumbered in. Later, this virus was named the Sigma Virus, after the Repliroid “Sigma” who led a revolt against the human leadership.

1XX years ago: Formation of the Irregular Hunters

1XX年前 イレギュラーハンター部隊結成
Following through with the disposal of Irregulars, the human leadership decides to have Irregulars exterminated by Repliroids, and forms the Irregular Hunters. Ironically, the leader of the first generation of Irregular Hunters is Sigma.

1XX years ago: Zero awakens

1XX年前 ゼロ起動
Receiving information of Zero awakening from his capsule and causing violence, the Irregular Hunter Sigma finds and intercepts him. during this incident, Sigma is infected by the unknown computer virus leaking out from Zero’s capsule, but at the same time Zero, having his armor damaged in the battle with Sigma, also becomes infected with the virus. Due to this, Zero’s personality completely changed, and he would turn to working as an Irregular Hunter.

1XX years ago: The Irregular Wars begin

1XX年前 イレギュラー戦争開戦
Infected by the unknown computer virus, Sigma defects to the side of the Irregulars and leads a revolt against human leadership. The wars between the Irregulars and the Irregular Hunters for the future of humanity begins.

1XX years ago: Fall of the colony “Eurasia”

1XX年前 コロニー「ユーラシア」の落下
Under Sigma’s orders, the Repliroid mercenary Dynamo causes an obsolete space colony “Eurasia” to crash into Earth. Along with recognizing the threat of the Irregulars anew, the human leadership professes its aim of eradicating all Irregulars. The site that became a contamination zone is dubbed Area Zero, and for the next 100 years would be barred from entry.

1XX years ago: The Nightmare Incident

1XX年前 ナイトメア事件
“The Nightmare Incident” occurs, an event where a subspecies of the Sigma Virus that attracts attention as the Nightmare Virus spreads throughout the world. The fact was proven that Zero was its source, as he was a carrier of the Sigma Virus, and was contagious to his surroundings as he worked across the world as a Hunter. In finding this, the human leadership decides for Zero to be sealed away, but due to the influence of scientists studying the Sigma Virus, his cognitive program was removed from his body so the two could be researched separately.

1XX years ago: The birth of the Mother Elf

1XX年前 マザーエルフ誕生
A Repliroid researcher of this time (Dr. Ciel’s great-grandmother) studies Zero’s cognitive program and discovers an antibody to the Sigma Virus. She completes the Mother Elf, a program lifeform that can rewrite and erase the Sigma Virus. Afterwards, the scientists in the field of researching the Sigma Virus make researching Cyber Elves their focus.

1XX years ago: The Elf Wars rise from the Irregular Wars

1XX年前 イレギュラー戦争から妖精戦争へ
There are many historians who define the end of the Irregular Wars as the period when the number of Irregulars dropped significantly due to X’s using the Mother Elf. In actuality there is no enduring the conflict, and afterwards the latter period of the Irregular Wars came to be known as the Elf Wars.

1XX years ago: The proposal of Project Elpis

1XX年前 プロジェクト・エルピスの提唱
A member of the humans researching Cyber Elves proposes “Project Elpis,” an operation to create a Repliroid that’s a perfect ruler using the Mother Elf’s program rewriting ability. X opposed this operation, but out of fear of a long-lasting war support begins for complete control of Repliroids. The confrontation of X’s “philosophy of coexistence” and the human leadership’s “philosophy of rule” begins.



"If an enemy appears in front of me.... I will destroy it..."
Previously a major player in the Irregular Wars, the legendary red Repliroid who was praised as a great hero. He was discovered and awoken from a 100 year slumber by Ciel. Because of the long years he spent out of commission, he suffered some memory loss when he woke up, and even his abilities needed time to reawaken. In the closing period of the Elf Wars, he crushed Omega who held the world in a grip of fear, along with his master Vile's cruel ambition, but this would ultimately lead the way to a new battle.


"To me, you are Zero."
A human young lady who performed Repliroid research in Neo Arcadia. She created Copy X to help compensate for X's disappearance, but she had misgivings when Repliroids started being disposed of due to the energy shortage and she left Neo Arcadia. After that she organized the Resistance to protect the Repliroids, and meanwhile worked tirelessly every day to develop a new energy source to help end the conflict. The visor that Ciel uses were kept from her time in Neo Acadia studying Cyber Elves, allowing her to see and come in contact with Cyber Elves despite her being a human.

Cyber Elf

人間にとって未知のコンピュータ生命体。通常、レプリロイドの意志、意識、人格などを指す事が多い。様々な科学者の手によりレプリロイドの思考に関する研究が続けられているが、プログラムそのものではない「生命体で無い者の意志」については広く認知されている。サイバーエルフは不可視であるが、レプリロイドには見る(感じる)事ができるようだ。レプリロイドの思考プログラムに作用する未知のコンピュータウィルス「Σウィルス」の研究分野では、ウィルスが「意志」に作用する事が判明していおり、その「意志」をサイバーエルフと呼び、またその意志に働きかける事ができる存在(Σウィルス含む)も、サイバーエルフと呼称している。研究の成果はサイバーエルフによるレプリロイドの強化というレベルにまで達している。 A computer life form generally unknown to humans. Commonly referring to as a Repliroid's will, consciousness, personality, etc. While many scientists continue to study the Repliroid mind for answers, the current concept is generally acknowledged as not a program itself but the "volition of a bodiless life form." Though Cyber Elves are invisible, Repliroids are able to see (or sense) them. In the field of research focused on the activity of the mysterious computer virus the "Sigma Virus" on the Repliroid thought program, it was proven that the virus possessed an effect of "volition." That "volition" became known as a Cyber Elf, and additionally any such volition that had the ability to influence things in a similar manner (Sigma Virus included) became designated Cyber Elves. The study resulted in reached the level where it became possible to strengthen a Repliroid by means of a Cyber Elf.


サイバーエルフの扱いに長けており、ゼロが入手したサイバーエルフの育成などに携わっている。ベビーエルフ、クリエとプリエの名付け親でもある。 A skilled Cyber Elf caregiver, she helps the Cyber Elves Zero obtains to grow to their potential. She named Crea and Prea herself.


新しい武器やチップの開発など、技術面でゼロをサポートするレプリロイド。つねにシエルとゼロのことを心配している A Repliroid who provides Zero with technical support by developing all sorts of new weapons and chips. He always tries to look after Ciel and Zero.


レジスタンスベースを機転にさまざまな場所を旅しているため、各地の情勢に詳しいレプリロイド。趣味はポエムを作ること。 A quick-witted traveler residing at the Resistance Base, he has lots of info on various locations he's visited. As a hobby he also writes poetry.

Resistance Companions

イレギュラーとして処分されそうになったところをシエルによって助けられたレプリロイドたちの集団。わずかなエネルギーを頼りに暮らしながら、同じような境遇のレプリロイドを救うために活動している。 A group of Repliroids who were condemned to be disposed of as Irregulars, but were rescued by Ciel. Even though they're trying to live on short rations of energy, they extend their help to all Repliroids facing similar circumstances.


「伝説の蒼き救世主」 X
"The Legendary Blue Messiah" X
The legendary blue Repliroid and ruler of Neo Arcadia who symbolizes "infinite potential" and a "purveyor of justice" for all. Though he had done so for the sake of peace, he often worried over having to destroy his fellow Repliroids during the long confrontations of the "Irregular Wars", a condition which went mostly unchanged even after Zero went to sleep following the Nightmare Incident. In the closing period of the Irregular Wars (later referred to as the Elf Wars), X cooperated with Zero who had acquired a copy body, to capture the Dark Elf, and arranged to use his anti-virus countermeasure to seal her within his own body. When he sealed the Dark Elf, the shock forced X's soul from his body and split it into 5 Cyber Elves. Eventually, 4 of these souls were incorporated into the Shitennou of Neo Arcadia, while one continued to wander the world.

Neo Arcadia

妖精戦争当事、エックスより人間を保護するための組織として「ネオ・アルカディア」が結成された。エックス自ら英雄として君臨することでダークエルフを使わずにレプリロイドを「人望」で統制する事にも成功していた。妖精戦争に生き残った人類は、生活用の大型ドームの中で生活している状況であり、人間の生活圏はそのドームをおいて他にない。現在ネオ・アルカディアは政府の名称であるが、生活用ドームを指して、俗にネオ・アルカディアと呼ぶことがある。人間には代議員がおり、レプリロイドと協議してネオ・アルカディアの政策を行っている。 Concerned over the Elf Wars, X formed the "Neo Arcadia" organization for the sake of providing protection for the humans. X himself was a great person who rather than exercising control by using the Dark Elf, he successfully used his "reputation" to invoke order. The remnants of mankind who survived the Elf Wars were able to continue living within an enormous dome, but outside the dome the conditions were unsuitable to support human life. Nowadays Neo Arcadia is the name of the government, although the life-sustaining dome itself is commonly referred to as Neo Arcadia as well. Humans representatives consult with Repliroids to carry out Neo Arcadian policy.


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