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We are born of two universes. Each of them imperfect; each afflicted with the cancer of organic life. From their ruins, a new universe shall be forged, in the fire 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 at the very beginning of Marvel vs. Capcom: Infinite's story mode.
Heroes of both dimensions... Welcome to ours!
~ Ultron Sigma introducing his enemies to the combined universes.
Good, evil... We have transcended such... limited concepts.
~ Ultron Omega before fighting Thor and X.
You shall feel our wrath... KNEEL BEFORE YOUR GOD!!!
~ Ultron Omega before the final battle in Story Mode.
Ultron Sigma is the main antagonist of the crossover fighting game Marvel vs. Capcom: Infinite. He is a fusion consisting of both Ultron and Sigma, with their ultimate goal to obliterate all organic life.
They later transform into their final form Ultron Omega, the game's final boss, after they failed to harness the Soul Stone due to lacking a soul.
He is voiced by both Jim Meskimen and Chris Tergliafera (the latter also voiced Gundham Tanaka from the Danganronpa series and Rasticore from Star vs. the Forces of Evil) overlapping each other, owing to his being fused from Ultron and Sigma.
After Death is convinced by Jedah into merging both the Marvel and Capcom universes in order to bring equilibrium between life and death, she calls upon Thanos and gives him the Space Stone, ordering him to find the remaining five, while pointing out the Reality Stone was out of reach.
Thanos calls upon Ultron and shows him Abel City, where the stone is located, which was protected by a force-field that only Ultron could cross, offering Ultron the city and all of its wonders in exchange for his cooperation. Using the Space Stone's power, the two reach the field's border. As Ultron crosses it by entering Cyberspace, he is immediately confronted by Sigma. The two admired one another's mechanical natures, though Ultron disliked Sigma's pseudo-organic form, just as Sigma admit and considered his own form is nothing more than a mock-up of an actual organic lifeforms. Resolving to work together to "cleanse" both of their universes of organic life (of which they were both contemptuous), they move into Sigma's base on Abel City, where Sigma kept the Reality Stone. At this point, Ultron and Sigma began to betray Thanos, with Sigma had Ultron to stab his body and upload his A.I. into the former, merging together into a single being called Ultron Sigma.
After defeating Thanos and taking the Space Stone, Ultron Sigma began to use it and Reality Stone to not only transform Ultron's old body, but also brings about "the Convergence", fusing the Marvel and Capcom universes into one. From there, he took over Asgard (now fused with Abel City to become "Xgard"), turned the Asgardian warriors into cybernetic slaves, and even managed to turn Thor into his puppet, before the other heroes from both universes freed Thanos from Ultron Sigma and escaped with him.
The heroes of the Marvel and Capcom universes work together to find the other Infinity Stones and stop Ultron Sigma. In the meantime, Ultron Sigma forges an alliance with the Grandmaster Meio, who works on creating a weapon inside Luanehnum's core using the Sigma Virus and the Power Stone.
As the heroes separate to look for the Stones, Ultron Sigma sends his drones to track the heroes, eventually attacking the unprotected Avengers base himself. Iron Man, Spencer and Dr. Light use their combined efforts to short-circuit Ultron Sigma, causing an explosion that frees Thanos. Thanos attacks Ultron Sigma and overpowers him, cracking the Reality Stone. This causes their fusion to become unstable, so they retreat to repair themselves.
After the heroes destroy Meio's weapon and a huge symbiote monster created by M.O.D.O.K. and Jedah, they take the three stones in their possession and attack Xgard, while Dante goes after Jedah to retrieve the Soul Stone in his possession.
When the heroes finally reach Ultron Sigma, he reveals that Dante betrayed them and had already given him the Soul Stone. However, Dante had been tricking him into using the Soul Stone's power, blasting him away, since he had no soul and thus could not wield it.
With their fusion becoming more unstable as a result, they transform into Ultron Omega and trap Dante for his trickery until Thor (now cured by the Soul Stone) and X manage to save the Devil Hunter from the unstable fused robot's grasp. Dante and Captain Marvel then attack Ultron Sigma while X charges a weapon powered by the other four Infinity Stones designed by Iron Man. With Ultron Omega defeated, X fires the weapon which ends the corruption caused by the Sigma Virus and can kill Ultron Omega permanently. Yet, the two worlds are still in the converged state, as the Reality Stone is cracked due to the result from the previous battle of Thanos and Ultron Sigma at the Avengers Tower, rendering the stone useless and might cause another convergence with other different realities when being used in this state, thus required to be fixed in the mean time. Afterwards, the heroes each agreed to safeguard the Infinity Stones to keep them out of the wrong hands, and to keep fighting for their fused universes as they were.
Ultron Sigma is the second original antagonist in the Marvel vs. Capcom series, the first being Abyss from Marvel vs. Capcom 2: New Age of Heroes.
However, he is also the first fusion character in the series.
Ultron Sigma can be considered to be a Marvel counterpart to Dark Kahn from the another crossover fighting game Mortal Kombat vs. DC Universe, a fusion between Darkseid and Shao Kahn.
His battle theme takes elements from Sigma's theme from Mega Man X2 and "Heroes" and "Avengers Unite" from the original soundtrack of Avengers: Age of Ultron, as well as the Terminator main theme.
This is not the first time Ultron had fused with another character; In the comics, Ultron has fused with his creator Hank Pym.