Sigma

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Character Info

Artwork from Mega Man X.
General information
Name(s):	Sigma, The Professor
Group(s):	Maverick Hunters, Mavericks
Appearances Appearances: Mega Man Games: Mega Man X, Mega Man X2, Mega Man X3, Mega Man X4, Mega Man Xtreme, Mega Man X5, Mega Man Xtreme 2, Mega Man X6, Mega Man X7, Mega Man X: Command Mission, Mega Man X8, Mega Man Maverick Hunter X, Mega Man X DiVE Other Games: Marvel vs. Capcom: Infinite Other Media: 1994 animated series, Archie Comics
1994 cartoon Info 1994 animated series info Voice: Jim Byrnes Episode(s): "Mega X"
Voice Info
Voice (JP):	Mugihito
Voice (EN):	Charlie Fontana (X4), Walter Roberts (X7), Dave Pettitt (X8), Gerald Matthews (MHX), Chris Tergliafera (MvC:I)

Sigma (シグマ) is a major character and antagonist in the X era, serving as the final boss of most Mega Man X games. He is a highly-advanced Reploid who was originally built by Dr. Cain to lead the Maverick Hunters, but became infected with the Maverick Virus, driving him to despise humanity and threaten to take over the world. His mind develops into the Sigma Virus, a form in which he survives throughout the series even as his body is destroyed.

Though Sigma assumes different forms throughout the series, he always retains iconic features such as his bald head, glowing eyes, and a muscular figure with green and/or purple armor.

In the Games

A flashback in Mega Man X4 shows Sigma's past leading the Maverick Hunters. When Sigma learned that the berserk Zero had destroyed Garma's unit, he went to face the mysterious Maverick himself. He was overpowered by Zero in the ensuing battle, until Zero was suddenly immobilized by a great pain: the Maverick Virus taking hold. Unaware of this, Sigma took the chance to punch Zero's head and defeat him. He then ordered the Maverick Hunters to take Zero back for study, while he limped away for repairs. However, Sigma was unaware that he too was affected by the Maverick Virus, and in the following period of time it began influencing his thoughts towards rebellion against the humans.

Mega Man X

Sprite of Sigma in his cloak, from Mega Man X.

Sigma debuts in the first Mega Man X. According to the manual, he was built by Dr. Cain prior to the events of the game to lead the fight against Mavericks, reploids that have gone haywire and are posing a danger to humans. Though Sigma was built with special protections, he goes Maverick himself and takes most of the other Hunters with him, prompting X to take up the fight together with Zero, the new leader of the Maverick Hunters.

X does not encounter Sigma until Sigma Stage 4, at the end of the game, though the entirety of his fortress uses his portrait as the map picture on the stage select screen. After X climbs to the top of a vertical shaft, Sigma teleports in, wearing a cloak, and gloats that he could easily destroy X, but will leave him to his pet wolf, Velguarder. If X succeeds in defeating the wolf, Sigma returns, observing that X is "almost as good a hunter as [he] was", then throws off his cloak and engages X with his original battle body, armed with a beam sabre.

When Sigma is defeated in this form, his body is destroyed and only his head remains, which floats up onto a giant wolf-like robot in the background and continues to fight as Wolf Sigma. When X is once again victorious and the robot begins to explode, Sigma insists that he cannot be destroyed by X and questions why X is fighting against reploids, claiming that he could have "ushered in a new age" if he had been allowed to destroy humanity.

Although defeated, Sigma's face reappears on a monitor after the credits roll, revealing that X only succeeded in destroying a temporary body and his "spirit" remains intact, hinting to the Sigma Virus. Sigma states that he will find other bodies and threatens to return "very soon", a threat he follows up on in the next game.

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