Sigma/Mega Man X2

Sigma
In-Game Information
HP:	Form 1 (Neo Sigma): 32 Form 2 (Sigma Virus): 64
Attack Damage:	Form 1 (Neo Sigma): 2 (contact) 2+2 (Claw Attack) 2 (Aerial Claw Attack) 4 (5-Bullet Shot) 6 (Electromagnetic Wave) Form 2 (Sigma Virus): 2 (contact) 6 (Heat Ray) 4 (Minion Summon) 2 per hit (Body Assault)
Weakness:	Form 1 (Neo Sigma): Sonic Slicer Form 2 (Sigma Virus): Strike Chain
Main Stage:	Central Computer
Series Information
In-game Appearances:	Mega Man X2
Theme Music

Sigma is the final boss from Mega Man X2. With the help of the X-Hunters, Sigma gained a new body much stronger than his original body. X fights Sigma inside the Central Computer Stage after Zero opens the path to him. Once his first form is destroyed, Sigma assumes his true form: the Sigma Virus.

Strategy

Neo Sigma

Neo Sigma (ネオシグマ, Neo Sigma) is Sigma's first form, armed with arm-mounted claws and electric attacks. He is weak to Sonic Slicer.

	Claw Attack (爪攻撃, Tsume Kōgeki)
	Sigma rushes forwards and slashes with a claw, bouncing the player off the wall on hit.
	Damage: 2+2
	Aerial Claw Attack (空中爪攻撃, Kūchū Tsume Kōgeki)
	Sigma jumps off the wall and disappears, then reappears above the player with a diving claw attack.
	Damage: 2
	5 Bullet Shot (弾5発射, Dan 5 Hassha)
	Sigma summons five lightning balls that sequentially fly in the player's direction.
	Damage: 4
	Electromagnetic Wave (電磁波, Denjiha) Nightshade Electric Spark
	Sigma charges up, briefly becoming invincible, before throwing a wall of electricity from both claws. He only uses this attack when below half health.
	Damage: 6

Sigma Virus

Sigma Virus
In-Game Information
HP:	64
Attack Damage:	2 (contact) 6 (Heat Ray) 4 (Minion Summon) 2 per hit (Body Assault)
Weakness:	Strike Chain
Series Information
In-game Appearances:	Mega Man X2
Theme Music

Sigma Virus (シグマウィルス, Sigma Virus) is the final boss from Mega Man X2. With his Reploid body destroyed, Sigma reveals his true form as a virus, continuing to fight X with an energy body shaped like a 3D wire frame head of Sigma. The Sigma Virus can only be harmed by a Charge Shot, Strike Chain, or Shoryuken. It has no health meter, so damage dealt can only be determined by its color (green for default, blue for medium, red for critical). It attacks by summoning enemy Mechaniloids or firing heat rays from its mouth. After losing some health, he may also warp to X's current location to harm him inside his frame.

	Heat Ray (熱線, Nessen) Viral Laser
	Sigma Virus fires a red beam into the ground while moving horizontally.
	Damage: 6
	Minion Summon (ザコ敵召喚, Zako Teki Shōkan) Viral Summon
	Sigma Virus summons two enemies; they can be either a Fishern, Tiranos, Scriver, or Tubamail-S.
	Damage: 4 (enemy contact)
	Tackle (体当たり, Taiatari) Error and Delete
	Sigma Virus teleports to the player's location to trap them and deal constant damage. Must be escaped by mashing buttons. Only used in its red state.
	Damage: 2 (per hit)

Mega Man Xtreme 2

Sigma
Sigma as he appears in Mega Man Xtreme 2.
In-Game Information
HP:	Form 1: 32 Form 2: 32
Attack Damage:	Form 1: 6 (contact) 8 (Claw Attack) 10 (Aerial Claw Attack) 4 (5-Bullet Shot) 10 (Electromagnetic Wave) Form 2: 8 (contact, machine) 8 (contact, Sigma) 2 (energy orb) Instant Death (crush, Zero) 8 (slow barrier dash, X) 8 (fast barrier dash, Zero) 2 (barrier toss, Zero) 2 (laser, X)
Weakness:	Form 1: Drill Crush/Dash/Marine Tornado Form 2: Tornado Fang/Z-Saber/Marine Tornado
Series Information
In-game Appearances:	Mega Man Xtreme 2

In Mega Man Xtreme 2, Sigma appears in Extreme Mode after the defeat of Berkana or Gareth, depending on if the player is X or Zero.

Strategy

Neo Sigma

Sigma's first form is the same as his Neo Sigma body from Mega Man X2, except for the amount of damage he deals and takes, having different weaknesses.

Sigma Beast

Instead of the Sigma Virus, Sigma's second form is Sigma Beast (シグマビースト, Shiguma Bīsuto), a large Ride Armor. The color of his second form is initially orange, but later alternates between blue and red, which can only be damaged by X while he is blue, and by Zero when red. His weak point is the large lion-like face in his chest. When the Ride Armor takes enough damage, Sigma is temporarily stunned, appearing in his Neo Sigma form, allowing the Maverick Hunters to damage him.

• Green Light Bullet (緑の光弾): Sigma Beast fires a ball of light. Can be reflected by Zero's saber.
• Light Bullet Summon (光弾召喚): Sigma Beast fires a ball of light from the air.
• Laser (レーザー): Sigma Beast jumps and shoots a laser below himself.
• Earthquake (地震): Sigma Beast jumps, causing a tremor that can stun the player.
• Dash (突活): Sigma Beast accelerates with a large shockwave.
• Wave (ウエーブ): Sigma Beast shoots a large shockwave.

Other appearances

Mega Man X DiVE

Sigma Virus appeared as a Raid Boss and Guild Boss in Mega Man X DiVE. His strategy is similar to the original, but the enemies he summons are different.

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PLEASE NOTE: THE FOLLOWING INFORMATION IS ABOUT MATERIAL THAT HAS NOT BEEN LOCALIZED OR DUBBED OUTSIDE OF JAPAN OR OTHER ASIAN COUNTRIES, AND USES THE ORIGINAL TERMS AND NAMES.

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Dragon Poker

Sigma (both as Neo Sigma and Sigma Virus) appeared as an event character and enemy in Dragon Poker.

Player card

Sigma Virus is a branch evolution of Neo Sigma.

Image	Name	Attribute	Skill	Support Skill	Super Union
	ネオシグマ (Neo Sigma)	Wood	ワープ強襲 (Warp Assault)	第17精鋭部隊の元隊長 (Former Commander of the 17th Elite Unit)	悪性ウイルス (Malign Virus)
	シグマウイルス (Sigma Virus)	Wood	メカニロイド召喚 (Mechaniroid Summon)	プログラムウィルス (Program Virus)

Enemy

The event had three battles. In the second, the player's team fights against Neo Sigma and Black Zero at the same time. After their defeat, the player's team fight against Sigma Virus, who uses a variety of attacks and buffs, and can summon Mechaniroids to assist him, having up to two at a time. The Mechaniroids attack enemies and provide additional buffs.

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END OF UNLOCALIZED MATERIAL.

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Gallery

Alternate artwork of Neo Sigma from Mega Man X2.

Neo Sigma's back.

Neo Sigma in the Rockman X2 Carddass.

Sigma with Fake Zero in the Rockman X2 Carddass.

Sigma Virus card in Mega Man X DiVE.

Sigma Virus as a Raid Boss in Mega Man X DiVE.

Videos

Megaman X2 Final Stage (SNES) (HD HQ)

Mega Man X2 - Final stage.

Trivia

• While Neo Sigma is depicted wearing a cape in official art and in the opening scene of the PlayStation and Sega Saturn version of Mega Man X3, he is never seen wearing it in his in-game sprites.
• The Sigma Virus is one of the few final boss forms without a visible health bar, the other being Master Albert's throne in Mega Man ZX Advent.
• In Compendium of Rockman X, Neo Sigma was only named "Sigma", and Sigma Virus was misnamed as "Neo Sigma".