Mega Man
- Dr Light and Dr Wily work together as college students, become good friends.
- Dr Wily is disgraced for illegal robot experiments.
- Knowing his old friend needs a chance to redeem his name, Dr. Light hires Dr. Wily to work as a consultant on his projects secretly.
- Working together on a military project, Dr. Light and Dr. Wily make Blues. Unexpectedly, Blues can think for himself, but has a flawed reactor that will eventually kill him.
- After showing off Blues to the military, Dr. Light talks about fixing Blues. Blues thinks he'll take away his free will and runs away.
- Dr. Light and Dr. Wily design the Sniper Joe line for the police and military, which finances their laboratory. They make a bunch of other smaller projects to keep the money coming.
- Eventually Dr. Light and Dr. Wily decide to go big and design and build the Robot Masters.
- Around this time Dr. Light gets lonely and builds Rock and Roll, a lab assistant and house keeper that he treats more like kids than machines.
- As the time comes to unveil the Robot Masters, Dr. Wily grows jealous of the media attention Dr. Light is getting. He sabotages the Robot Masters and has them run amok.
- Rock decides that only a robot can fight other robots. He asks Dr. Light to turn him into a fighting machine. Dr. light reluctantly obliges and turns Rock into Mega Man.
- Mega Man fights the Robot Masters, deactivates them, and allows Dr. Light to fix their programing. Mega Man fights and defeats Dr. Wily, who goes to jail.
- Dr. Wily escapes and starts building Robot Masters of his own. Somewhere along the line he finds an almost dead Blues and fixes his core but allows him to keep his free will. Unable to forget his debt but ashamed of his actions, Blues asks for a way to hide his identity. Dr. Wily gives him a helmet and sunglasses. Blues becomes Breakman.
- Mega Man fights and defeats two sets of Robot Masters before running into Breakamn. Unable to strike down his brother, Breakman saves Mega Man's life but tells him that he'll have to go home alone. Protoman is born.
- Wily builds more Robot Masters, but also builds his own version of Protoman: Bass. Bass turns out just like Protoman and ditches Dr. Wily, though the two work together from time to time.
- An alien robot lands on Earth, powered by a corrupting energy. Wily finds it and uses it against Mega Man. It is defeated, but not before Wily hides some of the energy.
- The Robot War between Dr. Light and Dr. Wily continues for years before finally slowing to a crawl as both of them are about to die from old age. Both build their ultimate creations...
- Dr. Light designs X, who has a chip that allows him to think, feel, and experience real emotion. He seals X away for 100 years so that his machines can ensure that the chip will work as expected. He also designs various tools for X, sealing them around the world in capsules with an AI copy of Dr. Light.
- Dr. Wily designs Zero. He has all the same features as X, but Dr. Wily is unable to properly finish his equipment. Instead Dr. Wily designs the Zero virus, a virus designed to make X go crazy when he's exposed to it. Unfortunately, Dr. Light found out about it and made X immune. Dr. Wily also creates an AI copy of himself like Dr. Light.
- Dr. Wily and Dr. Light both die before their creations come to light. Both lie hidden for 100 years...
Mega Man X
- 100 years after the deaths of Dr. Light and Dr. Wily, Dr. Cain finds X in the ruins of one of Dr. Light's old labs. He (imperfectly) copies the design and creates Reploids... machines that can think and feel for themselves. X is activated and lives peacefully for a time.
- Eventually, some Reploids decide that they'd rather not follow the orders of humans. Declaring them "Mavericks", the governments of the world create the Maverick Hunters, headed up by the reploid Sigma.
- Around this time Zero is awoken and goes crazy. Eventually he and Sigma fight. Sigma deactivates him and purges him of the Zero virus, but becomes infected himself.
- Zero is fixed and joins the Hunters. X joins shortly after.
- Sigma (infected with the Zero virus) stages a Maverick revolt with his most trusted captains. Only X and Zero remain to fight the Mavericks.
- During the Maverick War, Zero is destroyed by Vile, an uninfected Maverick that simply hates humans. Zero's memory chip is recovered but the rest of his parts art stolen by the X-Hunters.
- X defeats Sigma, ending the first Maverick Revolt. However, Sigma's AI has merged with the Zero Virus to make the Sigma Virus, which goes on to corrupt other reploids.
- The X-Hunters rebuild Zero using Dr. Wily's original plans, which include better armor and a bad ass beam saber. Dr. Wily may have been running them behind the scenes.
- The second Maverick Revolt begins. Sigma makes a copy of Zero to fight X, but X reclaims the original Zero's parts and they defeat Sigma and the X-Hunters together.
- Several more revolts occur. Sigma is finally defeated by X, but not before Zero sacrifices himself to stop his last scheme. Zero is thought to be dead but he simply goes into stasis on Earth.
- Machines capable of purging the Sigma Virus are developed and produced. The Maverick Wars end. X becomes a leader of the new world where Reploids and humans live in earth. Hundreds of years pass.
Mega Man Zero
- Eventually, X decides to separate his AI and his body, so that he can watch over everything as a peaceful observer. The process doesn't work correctly... X's AI becomes free but a corrupted version is left in his body. X's body becomes a totalitarian facist, kicking humans who won't live by his rules out of his city. A resistance is formed and the Maverick Wars begin again.
- Zero's body is recovered and duplicated by Dr. Weil. The original is used by X to make a weapon. People find out and Dr. Weil is turned into a human/reploid hybrid as punishment. Dr. Wily's AI takes over the body of Dr. Weil.
- The copy of Zero is abandoned in Dr. Weil's lab. The resistance recovers it and convinces him to help them fight X. He does and Copy X is destroyed. X's AI is deleted in the process.
- Dr. Weil takes over after X is destroyed. Zero fights and defeats him.
- In order to stop the fighting, Humans and Reploids begin to become as one.
Mega ZX
- Dr. Weil threats the world a few more times. Some other people fight him because Zero is dead. (I think)
- Humans and reploids have almost fully merged into one species. The remaining pure humans flee to the moon.
Mega Man Legends
- The humans on the moon reduce life on earth to a fraction of it's total through a super weapon. Thousands of years pass and the survivors forget all of this happened.
- The remaining locations full of high tech equipment become treasure hunting spots, but are full of feral robots called Reavers. The Digger's Guild is formed to police access to keep people from getting killed.
- Rock Volnutt is found by Roll and he Grandfather on a dig. They reactivate him and he becomes a part of the family.
- Some stuff I don't remember about the first game happens. The Bonne family of pirates act like anime villians.
- The last surviving pure breed human activates his forces to wipe out humanity.
- Rock Volnutt finds a way to the moon and defeats the last human to save all life on Earth.
- He's trapped on the moon, so Roll and Tron Bonne build a rocket to save him.
- Legends 3 would have taken off from there but was cancelled because Capcom hates Mega Man. Rock Volnutt is STILL trapped on the moon.