Along with Magma Dragoon, he plotted the beginning of the Great Repliforce War and later dropped the space colony Eurasia on Earth with the help of Dynamo, seeking to spread as much viruses as possible only to see Zero's true potential.В The Earth became severely polluted and destroyed, leaving the world in an era of darkness called Maverick Spring.В Since the Maverick Hunters were low in numbers, a vigilante group called Red Alert appeared to fill the gap, but Sigma, with the codiname 'The Professor' manipulated Red and infected his subordinates in an attempt to get Axl's power for him.В Thanks to the efforts of the Reploids, Earth managed to become inhabitable once again in less than a decade, but people grew tired of the endless cycle of destruction and began plans to live sheltered in the Moon. Sigma Virus would then make its way to possess other machinery and Reploids in order to gain a physical body again and continue his rebellion through new schemes. It isВ uncertain what exactly happened with Sigma's original consciousness after the assimilation and how the evil nature of the program affected his mind.В After months, Sigma would turn against mankind and raise the First MaverickВ Wave on JulyВ 4thВ of 2174 and many Reploids who had rebellious tendencies followed his lead.В Sigma was eventually defeated by Mega Man X, but he survived the destruction of his body since he had become a Virus. Instead of becoming completely subdued to the influence of the Virus, Sigma could somehow resist the evil program and assimilated it, becoming a new entity called Sigma Virus, that possessed that body. Cain andВ first to be appointed as CommanderВ of the Maverick Hunters, but Zero's Maverick Virus was transferred to him during a fight and it began affecting his mind. He was the strongest ReploidВ ever created by Dr. SigmaВ is the main antagonist of the Mega Man X series. Several times, the last one being in April 2193

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