The year is 21XX. Reploids are commonplace now, after Dr. Cain rediscovered Dr. Light's old lab and based several designs off of Dr.Light's original, called "Megaman X." X, meanwhile, has joined the Maverick Hunters, and works with unit leader Zero under the command of General Sigma. It is their job to terminate rogue reploids, those who have become violent.
 
(Source: Anime News Network)

In the year of 20XX, a young boy by the name of Netto Hikari receives a very special gift as he enters the 5th grade. His very own customized net navi, Rockman! Despite Rockman's small size and far more responsible personality, the two boys quickly become the best of friends. A net navi is designed to guide his operator from the inside of his or her PErsonal Terminal, or simply PET for short. Children and adults alike enjoy friendly "Net Battles", where they spar their navis against each other to prove their worth. 
(Source: Official Site)

Trill, a mysterious navi said to have originated from the world of Beyondard, is discovered. And new beast-type enemies, the Zoanoroids, want him for his special power. Netto Hikari and Rockman must protect their new friend while they try to figure out what Trill is really and his connection to the two legendary cyber beasts, Grega and Faltzer.
 
(Source: Anime News Network)

Netto's father Yuuichirou Hikari has made a scientific breakthrough by introducing the "synchro chips". If an operator and his or her navi are in a special enviroment known as a "dimensional area", they can fuse together in the real world via a technique called "cross fusion"! Yuuichirou's first test subject, Misaki Gorou, attempts the process and sadly fails. Netto offers to try with Rockman, but his father forbids it. Cross Fusion puts enormous strain on the operator's health, and battling in the real world could mean death. 
(Source: Official Site)

A comet burns in the sky, its brilliant light shining down upon the people of Earth. At that time, a giant army of viruses invade the real world, crushing everything in their path. Netto and Enzan use cross fusion to intervene, but are whisked away to an unknown location, only to be confronted by the one responsible for the attack - Duo! 
(Source: Official Site)

Beast+ continues from where Beast left off, though it is marketed as a stand-alone series. Episodes are reduced to approximately ten minutes in length, airing in the thirty minute time-slot Oha Coliseum alongside the Saru Getchu anime. Beast+ consists of a string of arcs beginning with the appearance of the Professor and Zero (both from Mega Man Network Transmission). 
(Source: Wikipedia)

The second series is to follow the events of the second video game, focusing on the lost continent of Mu. The ancient civilization vanished ages ago, and a few of its remnants still exist as myths and legends called UMAs (unidentified lifeforms). The UMAs begin merging with humans in order to search for the treasures of Mu, the powerful ooparts, which will give them the power to revive Mu. After Subaru and War-Rock encounter several unusual enemies, they meet a professor named Doctor Orihime who sends them on a quest to find the ooparts and stop the UMAs. Using the ooparts, Rockman is able to take new forms, including Thunder Berserk, Fire Dinosaur, and Green Shinobi. (Source: Wikipedia)

Deep in the dark recesses of the UnderNet, Forte sleeps as he drifts aimlessly. In this cybernetic graveyard, a pulsating power re-awakens Forte, alerting him to a dangerous being shortly ahead. A haunting face appears amidst a massive bright purple blob, laughing directly at Forte. Cursing him, Forte finds himself powerless as the blob takes form, and captures him within its grasp! 
Nearing the time of sunset, a peaceful city and its people go about their everyday business. Curious bystanders on a sidewalk glimpse a shimmering purple light, which suddenly expands into tall pillar that reaches up to the sky. Screams erupt from the people as the pillar of light takes flight, absorbing everything in its destructive path. A tower clock dings the hour of 4 o'clock as the pillar desintigrates, leaving behind a trail of cybernetic residue and utter emptyness. 
'The Program of Light and Dark' 
(Source: Official Site)

The anime (episode 2, to be exact), where Rockman travels from the Game-World to the real world to learn some cultural differences about Japan, was intended to be a special episode for the original Mega Man cartoon series by Ruby-Spears, which aired around 1995 in the United States. As it seems, the special was finished before Ruby-Spears decided to redo their whole show with a completely new design better suited for American audiences. 
Not fitting the new style anymore, it never was included in the series. Still, two more episodes about the same story were produced a bit later, this time under the main title "Rockman" (unlike episode 2, where he's called "Mega Man" even in the Japanese dub). 
It's unknown if these 3 episodes ever saw an official release, until 2002, when Capcom of Japan decided to finally release them on DVD for Rockman's 15th Anniversary, all featuring a Japanese and English dub, but no subtitles. It's unknown if there are any more secret animated works of the original Rockman game series.

In the year 220X, the world has advanced toward radio-wave technology, and the world is connected through the Wave Road. Meet Subaru Hoshikawa, a fifth-grade student who lost his father in a space accident. Subaru meets an extraterrestrial radio-wave being named War-Rock, descending from a distant FM planet. War-Rock claims to know about Subaru's father, but many alien beings are after War-Rock. The two work together and merge into Rockman, a radio-wave human capable of traversing the Wave Road and battling the radio-wave viruses and FMs that threaten the Earth.
 
(Source: Anime News Network)

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