Wily that carried a computer virus called 'Maverick Virus'. The Maverick is revealed to be Zero, an evil robot created by Dr. While investigating, Sigma, along with his unit, tracked it down to an abandoned laboratory and faced the Maverick alone. However, one day, the Maverick Hunters received reports of an overwhelmingly powerful 'Red Maverick' that destroyed an entire squadron of Hunters. Prior to the first Mega Man X game, Sigma was the most advanced Reploid of his time, leading the Maverick Hunters. He serves as the final boss in all games except Mega Man X: Command Mission and Mega Man X8 (he does not appear in the former and in the latter, Sigma is the penultimate boss). He is fond of incorporating himself into battlesuits which are vastly larger than his 'regular' form. Although he has been destroyed countless times, Sigma's programming always survives, either building himself a new form, or is revived by Reploid and Maverick admirers alike it is implied that he grows more insane with each revival. Sigma is a skilled and charismatic manipulator, managing to turn various Reploids, Maverick Hunters, and Mavericks to his side.

As the former leader of the Maverick Hunters, Sigma is a capable military leader, rendering him a devious and strategic opponent to his primary enemies, X and Zero. Sigma appears as a tall, bald humanoid in most of his forms. He has received praise from critics and fans for his design and charisma as a villain, though his introduction was noted as marking a darker and more pessimistic theme for Mega Man X compared to other Mega Man sub-series. Sigma has appeared in almost every Mega Man X video game since his first appearance in the 1993 title Mega Man X. Due to the virus integrated into his circuits, he can survive seemingly anything, and constantly returns to menace the world.

He defects to the Mavericks and assumes the role of their leader. Although he was once respectable, Sigma unexpectedly goes berserk during Mega Man X and rebels against humankind after coming into contact with the Maverick Virus. Cain, Sigma was considered the finest of the Reploids and was the first leader of the Maverick Hunters, peacekeeping androids who defend humans against their renegade counterparts. Sigma ( Japanese: г‚·г‚°гѓћ, Hepburn: Shiguma) is the main antagonist of the Mega Man X video game series. Concept art of Sigma as he appears in Mega Man XД¬hris Tergliafera ( Marvel vs Capcom: Infinite)

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