Disclaimer: I don't own megaman or x or zero or reploids or sigma or ciel or this world where the story takes place All events and characters in this story are entirely fictional, any resemblance to real people or events is coincidental

In the year 3020, fantastic advancements have been made in the technology of robotics. A man named Dr. Norman Sigma invented a device that could be placed inside the brain and spinal cord, connecting to the vital organs, that would prevent most illnesses, both mental and physical, and would grant the subject eternal youth and immortality. This device was called a 'reploi'. In its development stages, no human was brave enough to undergo the dangerous surgery, despite its benefits. Dr. Sigma failed to find a subject to test his great advancement on, until his own 15 year old son, Robert, stepped forward and agreed to be the first one to undergo the surgery. Despite Sigma's pleas that his son not endanger his life, he stood his ground. Sigma eventually realized that he needed a human subject and he wasn't going to get one anywhere else. Due to Sigma's lack of trust for most humans other than himself and his son, he performed the surgery himself. Although Sigma did have an advanced knowledge of medical science, he has trouble performing such an advanced surgery. His incompetence cost him his son's life. At least, that's what he thought. His son had died on the operating table, shortly after the reploi was installed. But the device began to take effect an instant after Robert's heart had ceased beating. Because of this, his body was kept alive, but his brain ceased functionality, leaving the reploi to take full command of Robert's body. Sigma noticed a change in his son and believed that his son's soul was lost. In actuality, his son's soul lived on, dormant within the dead shell, now controlled by a machine. Despite Sigma's doubt that this dead shell was truly his son, he continued to raise him just the same. Over the following 7 years, Robert's soul reawakened. Robert felt distant to his humanity by this time, having lived under the machine's influence for so long. In this spirit, he abandoned his human name, and dubbed himself X. Sigma was oblivious to his son's reappearance by this time, as he was now consumed with his work. The success of the first reploi experiment did not go unnoticed by the people of earth, and many of them underwent the surgery. Dr. Sigma continued to mass produce the reploi units, wanting to bring the gift of his creation to human kind. Despite the amount of humans who opted to undergo the surgery, countless others refused to do so, as it conflicted with their beliefs in some way or they were unable to afford it. The reploi surgery was undoubtedly popular, as over one third of the earth's population underwent it. Because of the amount of people who underwent the surgery, they were treated as a separate race that they called the 'reploids'.
After some time, the people of earth were not satisfied with the limits of the reploids, they hungered for more power. The Japanese government developed an advancement in the reploi technology, which would turn the reploids into living weapons. The government administered the reploi surgery on a homeless boy named Ollie, who had agreed to participate in the experiment in exchange for a sufficient amount of money for him to survive on for the remainder of his life, and then modified the technology to their own specifications. They renamed Ollie: Zero, or the prototype. These modifications gave Zero the ability to transform his right hand and fore arm into an energy canon, powered by a deposit of energon, the most powerful energy source of the time and the scarcest element on the earth, embedded in his forearm. This transformation was, of coarse, reversible. The prototype was also outfitted with thick plated, yet light, coat of armor, which covered most of his body, excluding his face. This armor protected Zero from any fall damage and the harm done by any non energy weapons, and was resistant to energy fire.
Very satisfied with these results, the Japanese Government created several more of their 'combat reploids' and used them to exercise their power over weaker nations. Zero, the original combat reploid, proved himself as the strongest by far, able to outlast all the others in any combat situation. For his valuable service, the Japanese government gave Zero a weapon designed for his use. It was a sword of energy that work with two conductors that transferred energy between them. He called it: Z Saber. Dr. Sigma was angered beyond compare by the blatant bastardization of his creations. He began to develop a virus that would infect the reploi system and cause the reploid to become angry and violent towards humanity as Sigma now was. The Japanese government learned of his plans and placed him in a federal; prison system. They soon realized they were too late, as they found that their most valuable ally, Zero, was infected with the virus and became humanity's greatest foe. Zero spread the virus to other reploids, and soon a fourth of them were infected. Those infected by the virus became known as 'Mavericks'. Dr. Sigma, seeing his revenge was complete, hung himself in his prison cell before any information that may lead to an antidote to the sigma virus was obtained from him.
X was angered by the rash actions of his father, and struck out against the mavericks, hunting down and destroying them, wherever he went. To make this job easier, X studied his father's plans that were left behind in his death and managed to improve upon the reploid system, creating a weapon like the one the combat reploids had wielded, but stronger and much faster. Although X could hold off most of the reploids, Zero was his greatest challenge, as he found himself equally matched by the combat prototype.
A man named Vincent Light strived his entire life to discover an antidote to the sigma virus. In his late seventies, he completed the antidote, and foolishly tried to eliminate humanity's greatest enemy by attempting to administer the antidote to Zero himself. He did manage to inject Zero's reploid core with the antidote, but by that time Zero had inflicted numerous wounds on Dr. Light and he died shortly after. Zero, angry at the virus that had imprisoned his mind, joined X in striking out at the Mavericks. Together the two became known as the 'Maverick Hunters'.

After many years of tireless combat, Zero was damaged and surrounded by a group of Mavericks. His Reploi system was damaged, and it shut down his bodily functions and placed his brain into hibernation, in order to prevent the damage from affecting the entire system and destroying the reploid. This reaction was a built in defense mechanism programmed by Dr. Sigma, to prevent the destruction of his creations in the event of a serious, yet non fatal attack. The government placed the deactivated Zero in an underground facility and surrounded him in a protective force field and stationed many guard robots to protect Zero's weapon system from being stolen. As he lay hibernated their, his system slowly recovered until the force field was the only thing keeping him their.
As X continued to fight bravely against the Mavericks, more of them were created in the absence of a strong resistance force. Mankind began to be struck with a great paranoia about the mavericks. The government built many powerful robots to protect mankind and to fight the mavericks. Being unable to distinguish those that were afflicted with the virus from those who were not, many innocent reploids began to be executed in a mass hysteria.
From the ashes of this dark future for reploids, a resistance force emerged. Led by a scientist named Ciel who believed the sigma virus was destroyed long ago, this underground force of reploids seeks freedom from the oppression their people face. Ceil had heard a legend of the most powerful reploid who had ever existed, who fought at the side of X, the only reploid spared from the human's wrath, and was destroyed at the hands of many Mavericks. She also had heard that Zero remained alive, and was now only imprisoned by a force field that the humans keep in place because of a great fear of him returning and becoming a Maverick again. Ciel has led a small party of reploid warriors in search of the legendary reploid Zero, believing him to be the only hope for the future of the reploids. . .

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