Mega Man X (Nintendo Cinematic Universe)

Mega Man X is a Japanese anime series.

Volume 1
A hundred years into the future, Maverick Hunters hunt down rogue Reploids know as Mavericks.

Volume 2
A trio of Mavericks calling themselves the "X-Hunters" has arisen, intent on destroying X by luring him with bodyparts of his comrade Zero, who died in the conflict with Sigma.

Volume 3
X and Zero must battle a Reploid scientist named Dr. Doppler and his utopia of Maverick followers.

Volume 4
X and Zero become involved in a conflict between the Hunters and a Reploid army called the "Repliforce".

Volume 1

 * The series takes place in an unspecified time during the 22nd century (21XX) and approximately 100 years after the Mega Man movies.
 * A human archaeologist named Dr. Cain discovers the ruins of a robotics research facility that had once been operated by the legendary robot designer Dr. Thomas Light.
 * Among the ruins, Cain finds a large capsule which contains a highly advanced robot with human-level intelligence and emotions, and even free will, the likes of which the world has never seen before.
 * Light had wished to instill within his creation reasonable sanity, good nature, and an understanding of the more controversial aspects of human morality. The robot was buried while running a 30-year diagnostic program to ensure these features.
 * Cain spends the next several months studying the robot, who is named Mega Man X, or simply "X".
 * Cain decides to duplicate X and, within several months, completes the first "replicate android" or "Reploid", a robot who can think, feel, learn, and grow exactly like a human.
 * Within the year, the design is standardized and Reploids are mass-produced. However, with the free will given to a Reploid comes the possibility of criminal activity; such rogue Reploids are branded as "Mavericks" by law-abiding citizens.
 * As the public outcry against the few Maverick incidents becomes too great to deny, the government steps in, and under the advice of Dr. Cain, forms an elite military police organization called the "Maverick Hunters".
 * The Hunters are to capture or disable any Reploids that pose a threat to humans, provide damage control at Maverick uprisings, help with disaster recovery, and perform other tasks as needed. To lead this group, Cain designs a very advanced Reploid, thought to be immune to whatever defect causes Mavericks. This robot, named Sigma, heads the Hunters for some time before ultimately becoming a Maverick himself, alongside the vast majority of the other Hunters, most of whom join him out of loyalty.
 * Sigma seizes control of a small island, driving out all human occupants. Claiming that the humans are inferior and that they are limiting the growth and potential of Reploids, he calls for his followers to begin a massive extinction effort.
 * X, guilt-ridden at having helped design such a dangerous race, joins forces with the only other remaining Hunter, Zero, in order to stop Sigma at any cost.
 * While on a mission involving a Maverick attack on a highway, X encounters Vile, a mercenary Maverick working for Sigma who pilots a mechanized tank called "Ride Armor".
 * Unable to defeat Vile, X is saved at a critical moment by Zero, forcing Vile to retreat.
 * Zero then offers encouragement to the less combat-savvy X after the battle.
 * X proceeds to track down and exterminate eight of Sigma's most powerful Mavericks, then rendezvous with Zero outside Sigma's stronghold.
 * Inside the compound, X finds that Zero has been captured by Vile.
 * Another battle ensues, ending similar to their first meeting with X at Vile's mercy. Zero suddenly breaks free of his restraints, latches onto Vile, and self-detonates, destroying his own body and the Maverick's Ride Armor.
 * Shocked over Zero's sacrifice, X regains his strength and finishes off Vile.
 * Zero encourages his comrade once again, and succumbs to his damage.
 * Now more determined than ever, X fights his way to Sigma, destroys the Maverick leader, and escapes the island fortress as it explodes and sinks.
 * As he returns to base, X reflects on the events that have unfolded, questioning Zero's sacrifice, his own decision to fight, and the ongoing war with the Mavericks.
 * Sometime later, a message from Sigma reveals that X merely destroyed a temporary body, and that Sigma's spirit lives on. Sigma then says that he would gather new, stronger bodies to do his bidding, and he would see X soon.

Volume 2

 * Six months following Sigma's death, X becomes the head of the Maverick Hunters.
 * X tracks a "manufactured Maverick" bearing Sigma's emblem to a Reploid factory, where he launches a full assault. However, despite Sigma's apparent death and X's recent efforts, the Maverick rebellion continues.
 * Three powerful Mavericks—Serges, Agile, and Violen—form a group called the "X-Hunters" and gain control of the North Pole.
 * In the time between Sigma's demise and the trio's sudden uprising, Serges has collected the deceased Zero's bodyparts.
 * After the factory mission, X is assigned to seek and exterminate eight Maverick leaders on a large continent directly south of the North Pole.
 * The X-Hunters contact the Maverick Hunters shortly thereafter and taunt them with Zero's body.
 * The X-Hunters drift among the eight Maverick locations and attempt to lure X out, each one promising the protagonist a piece of Zero if he can defeat them.
 * Dr. Cain states he will attempt to reassemble and reactivate Zero using his original control chip.
 * Just as X annihilates the last of the X-Hunters, Sigma reveals himself to have been behind the plot.
 * X leaves the exploding compound and tracks Sigma to the Central Computer, one of the eight locations he visited earlier.
 * A gray-armored clone of Zero accompanies Sigma; the real Zero then appears at X's side and destroys the clone.
 * The outcome of the event has Sigma retreating and Zero creating a passageway in the floor to allow X pursuit.
 * After X defeats Sigma, he reveals to X that his true form exists as a computer virus, and taunts to X that he will return. However, Sigma questions Zero's allegiance with humans, stating that Zero is "the last of the Doctor's creations".
 * X evacuates the facility to rendezvous with Zero outside, and the two watch as the facility self-destructs.

Volume 3

 * Humans coexist with intelligent robots called "Reploids".
 * Due to their free will, some Reploids are prone to criminal activity and are said to go "Maverick". Dr. Cain, the inventor of the Reploids, establishes a military taskforce called the "Maverick Hunters" to prevent it.
 * Even after two successful efforts by the Hunters Mega Man X and Zero to stop a Maverick leader named Sigma from attempting to exterminate the human race, Maverick activity seems to continue. However, the threat of the Mavericks is later neutralized thanks to the technology of the Reploid scientist Dr. Doppler, which prevents the Mavericks from going berserk.
 * The reformed Reploids form a utopia near their new mentor called "Dopple Town". It seemed that all is well until the former Reploids suddenly revert and once again begin causing trouble, even going so far as to attack Hunter headquarters. Doppler is held accountable, and X and Zero are sent out to contain the new threat.
 * Once the two heroes defeat Doppler and the forces that have sworn allegiance to him, the scientist comes to his senses and realizes all the damage that he has done. He explains that Sigma is alive as a computer virus, and that Doppler was corrupted in order to create a new body for Sigma.
 * X seeks out Sigma, and after an intense battle, the Sigma Virus in its pure form chases X in an attempt to infect and possess him.
 * Zero takes Doppler's true antivirus software and uploads it onto his sabre offscreen. He rushes in to save X just in time and causes Sigma to explode, destroying the lab as they evacuate.

Volume 4

 * Following the third defeat of Sigma, a second Maverick Hunting group has arisen. The army, called the "Repliforce", is a military regime led by the giant Reploid General and his second-in-command, Colonel.
 * Behind the scenes, Sigma has been trying to convince General that the Hunters are dangerous, and will turn on him. General dismisses Sigma, unwilling to betray the humans.
 * Zero, meanwhile, is plagued by a recurring nightmare: a mysterious figure awakens him, calls him a "masterpiece", then orders him to destroy an unknown target.
 * The Sky Lagoon, a massive floating city, is sent crashing down onto the city below it, killing countless humans and Reploids.
 * X or Zero are dispatched to investigate possible causes of the disaster, only to become entangled in a struggle to save the world.
 * At the crash site, X and Zero encounter Colonel, and attempt to bring him back to Maverick Hunter HQ for investigation.
 * Colonel denies Repliforce's involvement in the Sky Lagoon destruction, and refuses to disarm out of pride. Zero also rescues Iris, Colonel's kind-hearted sister, who was caught in the mayhem but is unharmed, and sends her to headquarters.
 * The Repliforce thus begins a movement to claim independence from the human government and create a nation for Reploids only.
 * Back at headquarters, X is greeted by a rookie Hunter named Double, while Zero rendezvouses with Iris. Double and Iris outline the locations of the Reploid leaders who have sworn their loyalty to Repliforce, as well as Mavericks unaffiliated with Repliforce that are spreading chaos.
 * Once four of the eight Mavericks are defeated, Colonel issues a challenge to X and Zero, which he escapes from after defeat.
 * Once all eight Mavericks are beaten, X and Zero are sent to a space port where Colonel guards Repliforce's launch into outer space; Colonel dies after an ensuing battle.
 * X and Zero infiltrate the Repliforce's space station, known as the Final Weapon, which is capable of destroying all human life on Earth.
 * X must fight Double, who is revealed to be a double agent sent to gain information from the Hunters.
 * Zero is forced to battle Iris, who is torn between the ideals of her brother and her feelings for Zero.
 * Zero kills Iris in the confrontation, which causes him to break down in an existential crisis, as he questions his ideals and motives.
 * Once Double, Iris, and General are defeated, Sigma reveals he caused the Sky Lagoon crash in order to instigate the conflict between the Maverick Hunters and Repliforce, and announces his intention to wipe out humanity.
 * Sigma reminds Zero of the time that Sigma led the Maverick Hunters, and of a vicious battle between the two that ended with Zero's apprehension as a Maverick.
 * In the end, Sigma is destroyed, but reveals he already activated the Final Weapon.
 * General then appears and sacrifices himself to destroy the Final Weapon, allowing X and Zero to escape and return to Earth.
 * X thinks back to the battles he had endured. Zero contacts X and tells him to return to Earth to rest. X begs Zero to promise to take care of him, should he become a Maverick himself. Zero tells X not to have such thoughts.
 * Zero is wrought with pain and guilt for being unable to save any of the Repliforce members, and becomes heartbroken over the death of Iris. He then wonders to himself if all Reploids are destined to become Mavericks.

Volume 1

 * Based on Mega Man X.

Volume 2

 * Based on Mega Man X2.

Volume 3

 * Based on Mega Man X3.

Volume 4

 * Based on Mega Man X4.