"We are born of two universes, each of them imperfect, each inflicted with the cancer of organic life. From their ruins, a new universe shall be forged, in the fires of the stones of reality, and space, all life remade in our image, in steel, free from the sins of the flesh. We are Ultron Sigma. We are your god."
—Ultron Sigma

Ultron Sigma
Ultron Sigma
Name Ultron Sigma
Gender None (programmed as Male)
Weapon/Power Super strength
Energy Blasts
Transfer consciousness to backup bodies and locations
Turning other Reploids into Mavericks
Sigma Virus/Maverick Virus
Combat proficiency
High intelligence
Affiliation Neutral-Evil
First Appearance Marvel vs. Capcom: Infinite (2017)
Voiced By

Jim Meskimen (Ultron)
Chris Tergliafera (Sigma)


Marvel & Capcom

Ultron Sigma is the primary antagonist for the storyline of Marvel vs. Capcom: Infinite. It is the result of Sigma's consciousness uploaded into Ultron's body as part of their master plan of destroying all organic life and merging both realities into one with them as its god. Their golden plated chassis formed after the fused machine held both the Reality and Space Infinity Stones. Their second and final form, Ultron Omega, is the end product of the fused robot’s foolishness for using the Soul Stone’s full-potential, upon being tricked by Dante.

Powers and Abilities

After a fusion between Ultron and Sigma and the Infinity Stones (the Reality and Space Stones) they held, Ultron Sigma obtained both of the Stone's powers.

Ultron Sigma retains most of Ultron's original move set, with Sigma's teleportation ability and swordsmanship in the mix.

With power over Space and Reality, Ultron Sigma is nigh omnipotent.

However, Ultron Sigma's only weaknesses are:

  • Being electrified just like the rest of mere machines
  • The Infinity Stone inside the fused machine being cracked and separating the robot back to Ultron and Sigma. As seen when Thanos cracks the Reality Stone on Ultron Sigma's head, giving the fused robot the first time ever to feel pain. To prevent the Reality Stone from cracking, Ultron Sigma must recover the Stone's crack carefully from being shattered.
  • Due to not having a noble soul and willpower, Ultron Sigma becomes completely weak to the Soul Stone. Not only does the Soul Stone transform Ultron Sigma into the ultimate abomination, Ultron Omega, it also nullified the fused robot's pain suppression and drove them to insanity. The Soul Stone also negated the Sigma virus, causing Sigma, who is immortal by that virus, to become mortal.


In the first battle with Ultron Sigma in Story Mode, it is unbeatable, reading inputs, not being able to drop below 80% health, and the Hyper meter filling up like the Mind Stone's Infinity Storm.

In Arcade Mode, Ultron Sigma is the sub-boss, just before Ultron Omega. The Arcade version is much easier than the one in Story Mode. In Arcade Mode, Ultron Sigma is alone and doesn't have minions on its side.

Ultron Sigma has possession of both Reality and Space Stones in gameplay, allowing the use of both their Infinity Storms.

In regards to gameplay, Ultron Sigma retains most of Ultron's original move set, with Sigma's teleportation ability and swordsmanship in the mix. Its Hyper Combos are the exact same as Ultron's, with the addition of an extra Level 3 Hyper Combo that allows Ultron Sigma to summon a powerful meteor shower at will.


  • Ultron Sigma is the second original antagonist for the Marvel vs. Capcom series, behind Abyss, but it is the first fusion of playable characters in the series.
  • Ultron Sigma can be considered to be a counterpart to Dark Kahn from Mortal Kombat vs. DC Universe, a fusion of Darkseid and Shao Kahn, two supervillains from two alternate universes and two different companies, and who spreads a negative influence, the Sigma virus, similar to how Dark Kahn spreads the Kombat Rage in Mortal Kombat vs. DC Universe. (Note: Midway Games, the original developer for the Mortal Kombat series of video games, was bought out by Warner Bros., which also owns DC Comics, and was rebranded as NetherRealm Studios.)
  • Its leitmotif incorporates elements from Sigma's battle theme from Mega Man X2/X6, "Heroes/Avengers Unite" from Avengers: Age of Ultron's original soundtrack, as well as the main theme from the Terminator film franchise.
  • Despite Ultron Sigma not having the capability to wield the Soul Stone, the fused robots, including their original halves can use the Soul Stone at ease outside of Story Mode.
  • As demonstrated by Ultron within Hank Pym’s body in the prelude of Marvel Comics' 2018 comic book event Infinity Countdown, the only way for Ultron and Sigma to use the Soul Stone is that they need to possess organic hosts, such as humans, and trap their souls inside the said stone in order to use its full-power, without having side-effects. Not possessing the knowledge on possessing organic hosts first in order to be able to tap into the Soul Stone’s power was a major mistake and the biggest weakness for Ultron Sigma, which turned them into Ultron Omega and cured the Sigma Virus.


Marvel vs Capcom: Infinite


  • "Fools, our will is law. We will destroy you."
  • "Those who control the stones control the universe."
  • ''Why try to fight us? We, who are God!''
  • ''You will never silence us!'' (Story Mode)


  • "This is your end! DIE!!!!!" or "This is your end! WE'LL OBLITERATE YOU!!!!! (Level 1 hyper combo)
  • "Now you'll see... Face our overwhelming power!" (Level 3 hyper combo)


  • "Imbecile, we are invincible!"


  • "Malfunction!"
  • "Why have... we?" (chip KO)