Ultron Omega

Ultron Omega is the final boss of Marvel vs. Capcom: Infinite. It is the second and final form of Ultron and Sigma's first fusion form Ultron Sigma. This form was created when Dante acquired the Soul Stone and it showed him that even with four infinity stone's they couldn't beat Ultron Sigma so he opted to go rouge and do it his way. Dante shows up for the final battle and actually outsmarts and tricks Ultron Sigma into using the Soul Stone which Dante handed over to him prior. When Ultron Sigma's attempted to use it to enslave his enemies his fusion became more unstable as Dante informs him that only a noble soul can bare and use the Soul Stone. Ultron Sigma then used the full power of their two stones mutated into Ultron Omega due to the Soul Stone destroying his original body and becoming insane. This ultimately cured the Sigma Virus and removed Ultron Sigma's immortality, which allowed the heroes to use the Infinity Buster to destroy the fused villains.