Thor had a vision in Avengers: Age of Ultron of the Tesseract being shattered and the blue stone joining the others in Thanos's Gauntlet. (cbr.com)
Two antagonists of both universes combine into one powerful creature known as Ultron Sigma. (gamepressure.com)
A combination of the robotic foes known as Ultron from the Marvel Universe and Sigma from the Capcom Universe, this psychotic villain is obsessed with infecting all organic life with a cybernetic virus. (shortpause.com)